utests MAINTAINCE Additing test for base type string.
diff --git a/tests/utests/CMakeLists.txt b/tests/utests/CMakeLists.txt
index 66f04a6..2419e7a 100644
--- a/tests/utests/CMakeLists.txt
+++ b/tests/utests/CMakeLists.txt
@@ -14,6 +14,7 @@
     PARENT_SCOPE)
 
 ly_add_utest(NAME int8   SOURCES types/int8.c)
+ly_add_utest(NAME string SOURCES types/string.c)
 
 ly_add_utest(NAME range  SOURCES restriction/test_range.c)
 ly_add_utest(NAME pattern  SOURCES restriction/test_pattern.c)
diff --git a/tests/utests/types/string.c b/tests/utests/types/string.c
new file mode 100644
index 0000000..cc58f68
--- /dev/null
+++ b/tests/utests/types/string.c
@@ -0,0 +1,1324 @@
+/**
+ * @file string.c
+ * @author Radek Iša <isa@cesnet.cz>
+ * @brief test for string values
+ *
+ * Copyright (c) 2021 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#define  _UTEST_MAIN_
+#include "../utests.h"
+
+/* GLOBAL INCLUDE HEADERS */
+#include <ctype.h>
+
+/* LOCAL INCLUDE HEADERS */
+#include "libyang.h"
+#include "path.h"
+
+#define MODULE_CREATE_YIN(MOD_NAME, NODES) \
+    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" \
+    "<module name=\"" MOD_NAME "\"\n" \
+    "        xmlns=\"urn:ietf:params:xml:ns:yang:yin:1\"\n" \
+    "        xmlns:pref=\"urn:tests:" MOD_NAME "\">\n" \
+    "  <yang-version value=\"1.1\"/>\n" \
+    "  <namespace uri=\"urn:tests:" MOD_NAME "\"/>\n" \
+    "  <prefix value=\"pref\"/>\n" \
+    NODES \
+    "</module>\n"
+
+#define MODULE_CREATE_YANG(MOD_NAME, NODES) \
+    "module " MOD_NAME " {\n" \
+    "  yang-version 1.1;\n" \
+    "  namespace \"urn:tests:" MOD_NAME "\";\n" \
+    "  prefix pref;\n" \
+    NODES \
+    "}\n"
+
+#define TEST_SUCCESS_XML(MOD_NAME, DATA, TYPE, ...)\
+    {\
+        struct lyd_node *tree;\
+        const char *data = "<port xmlns=\"urn:tests:" MOD_NAME "\">" DATA "</port>";\
+        CHECK_PARSE_LYD_PARAM(data, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);\
+        CHECK_LYSC_NODE(tree->schema, NULL, 0, 0x5, 1, "port", 0, LYS_LEAF, 0, 0, 0, 0);\
+        CHECK_LYD_NODE_TERM((struct lyd_node_term *) tree, 0, 0, 0, 0, 1, TYPE, ## __VA_ARGS__);\
+        lyd_free_all(tree);\
+    }
+
+#define TEST_SUCCESS_JSON(MOD_NAME, DATA, TYPE, ...)\
+    {\
+        struct lyd_node *tree;\
+        const char *data = "{\"" MOD_NAME ":port\":\"" DATA "\"}";\
+        CHECK_PARSE_LYD_PARAM(data, LYD_JSON, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);\
+        CHECK_LYSC_NODE(tree->schema, NULL, 0, 0x5, 1, "port", 0, LYS_LEAF, 0, 0, 0, 0);\
+        CHECK_LYD_NODE_TERM((struct lyd_node_term *) tree, 0, 0, 0, 0, 1, TYPE, ## __VA_ARGS__);\
+        lyd_free_all(tree);\
+    }
+
+#define TEST_ERROR_XML(MOD_NAME, DATA)\
+    {\
+        struct lyd_node *tree;\
+        const char *data = "<port xmlns=\"urn:tests:" MOD_NAME "\">" DATA "</port>";\
+        CHECK_PARSE_LYD_PARAM(data, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_EVALID, tree);\
+        assert_null(tree);\
+    }
+
+#define TEST_ERROR_JSON(MOD_NAME, DATA)\
+    {\
+        struct lyd_node *tree;\
+        const char *data = "{\"" MOD_NAME ":port\":\"" DATA "\"}";\
+        CHECK_PARSE_LYD_PARAM(data, LYD_JSON, 0, LYD_VALIDATE_PRESENT, LY_EVALID, tree);\
+        assert_null(tree);\
+    }
+
+static void
+test_schema_yang(void **state)
+{
+    const char *schema;
+    const struct lys_module *mod;
+    struct lysc_node_leaf *lysc_leaf;
+    struct lysp_node_leaf *lysp_leaf;
+    struct lysc_pattern *pattern;
+    struct lysc_range *range;
+
+    /* TEST BASE STRING */
+    schema = MODULE_CREATE_YANG("base", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_NUM((struct lysc_type_num *)lysc_leaf->type, LY_TYPE_STRING, 0, 0);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x0, 0, 0, "string", 0, 0, 1, 0, 0, 0);
+
+    /* TEST MODULE T0 */
+    schema = MODULE_CREATE_YANG("T0", "leaf port {type string"
+            "{length \"10 .. max\";}"
+            "}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 1, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_true(range->parts[0].max_u64 == 18446744073709551615ull);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "10 .. max", NULL, NULL, NULL, 0, NULL);
+
+    /* TEST MODULE T1 */
+    schema = MODULE_CREATE_YANG("T1", "leaf port {type string"
+            "{length \"min .. 20 | 50\";}"
+            "}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 0);
+    assert_int_equal(range->parts[0].max_u64, 20);
+    assert_int_equal(range->parts[1].min_u64, 50);
+    assert_int_equal(range->parts[1].max_u64, 50);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "min .. 20 | 50", NULL, NULL, NULL, 0, NULL);
+
+    /* TEST MODULE T2 */
+    schema = MODULE_CREATE_YANG("T2", "leaf port {type string"
+            "{length \"10 .. 20 | 50 .. 100 | 255\";}"
+            "}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 3, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_int_equal(range->parts[0].max_u64, 20);
+    assert_int_equal(range->parts[1].min_u64, 50);
+    assert_int_equal(range->parts[1].max_u64, 100);
+    assert_int_equal(range->parts[2].min_u64, 255);
+    assert_int_equal(range->parts[2].max_u64, 255);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "10 .. 20 | 50 .. 100 | 255", NULL, NULL, NULL, 0, NULL);
+
+    /* SUBTYPE MODULE T2 */
+    schema = MODULE_CREATE_YANG("TS0",
+            "typedef my_type {"
+            "    type string {length \"10 .. 20 | 50 .. 100 | 255\";}"
+            "}"
+            "leaf port {type my_type {length \"min .. 15 | max\";}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_int_equal(range->parts[0].max_u64, 15);
+    assert_int_equal(range->parts[1].min_u64, 255);
+    assert_int_equal(range->parts[1].max_u64, 255);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "my_type", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "min .. 15 | max", NULL, NULL, NULL, 0, NULL);
+
+    /* ERROR TESTS NEGATIVE VALUE */
+    schema = MODULE_CREATE_YANG("ERR0", "leaf port {type string {length \"-1 .. 20\";}}");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YANG, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - value \"-1\" does not fit the type limitations.",
+            "/ERR0:port");
+
+    schema = MODULE_CREATE_YANG("ERR1", "leaf port {type string {length \"100 .. 18446744073709551616\";}}");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YANG, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - invalid value \"18446744073709551616\".",
+            "/ERR1:port");
+
+    schema = MODULE_CREATE_YANG("ERR2", "leaf port {type string {length \"10 .. 20 | 20 .. 30\";}}");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YANG, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - values are not in ascending order (20).",
+            "/ERR2:port");
+
+    schema = MODULE_CREATE_YANG("ERR3",
+            "typedef my_type {"
+            "    type string;"
+            "}"
+            "leaf port {type my_type {length \"-1 .. 15\";}}");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YANG, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - value \"-1\" does not fit the type limitations.",
+            "/ERR3:port");
+
+    /* 
+     * PATTERN
+     */
+    schema = MODULE_CREATE_YANG("TPATTERN_0", "leaf port {type string"
+            "{pattern '[a-zA-Z_][a-zA-Z0-9\\-_.]*';}"
+            "}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 1);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "string", 0, 1, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6" "[a-zA-Z_][a-zA-Z0-9\\-_.]*", NULL, NULL, NULL, 0, NULL);
+
+    schema = MODULE_CREATE_YANG("TPATTERN_1", "leaf port {type string{"
+            "   pattern '[a-zA-Z_][a-zA-Z0-9\\-_.]*' ;"
+            "   pattern 'abc.*' {modifier invert-match;}"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 2);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[1];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "abc.*", 0, 0x1, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "string", 0, 2, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6""[a-zA-Z_][a-zA-Z0-9\\-_.]*", NULL, NULL, NULL, 0, NULL);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[1]), "\x15""abc.*", NULL, NULL, NULL, 0, NULL);
+
+    schema = MODULE_CREATE_YANG("TPATTERN_2",
+            "typedef my_type {"
+            "   type string{"
+            "       pattern '[a-zA-Z_][a-zA-Z0-9\\-_.]*' ;"
+            "       pattern 'abc.*' {modifier invert-match;}"
+            "}}"
+            "leaf port {type my_type {pattern 'bcd.*';}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 3);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[1];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "abc.*", 0, 0x1, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[2];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "bcd.*", 0, 0x0, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "my_type", 0, 1, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6""bcd.*", NULL, NULL, NULL, 0, NULL);
+
+    /*
+     * TEST pattern error
+     */
+    schema = MODULE_CREATE_YANG("TPATTERN_ERR_0", "leaf port {type string {"
+            "pattern '[a-zA-Z_[a-zA-Z0-9\\-_.*';"
+            "}}");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YANG, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Regular expression \"[a-zA-Z_[a-zA-Z0-9\\-_.*\" is not valid (\"\": missing terminating ] for character class).",
+            "/TPATTERN_ERR_0:port");
+
+    schema = MODULE_CREATE_YANG("TDEFAULT_0",
+            "typedef my_type {"
+            "   type string{"
+            "       pattern \"[a-zA-Z_][a-zA-Z0-9\\\\-_.]*\";"
+            "       length  \"2 .. 5 | 10\";"
+            "   }"
+            "   default \"a1i-j\";"
+            "}"
+            "leaf port {type my_type;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, "a1i-j");
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 1);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 2);
+    assert_int_equal(range->parts[0].max_u64, 5);
+    assert_int_equal(range->parts[1].min_u64, 10);
+    assert_int_equal(range->parts[1].max_u64, 10);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x0, 0, 0, "my_type", 0, 0, 1, 0, 0, 0);
+}
+
+static void
+test_schema_yin(void **state)
+{
+    const char *schema;
+    const struct lys_module *mod;
+    struct lysc_node_leaf *lysc_leaf;
+    struct lysp_node_leaf *lysp_leaf;
+    struct lysc_pattern *pattern;
+    struct lysc_range *range;
+
+    /* TEST BASE STRING */
+    schema = MODULE_CREATE_YIN("base", "<leaf name=\"port\"> <type name=\"string\"/> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_NUM((struct lysc_type_num *)lysc_leaf->type, LY_TYPE_STRING, 0, 0);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x0, 0, 0, "string", 0, 0, 1, 0, 0, 0);
+
+    /* TEST MODULE T0 */
+    schema = MODULE_CREATE_YIN("T0", "<leaf name=\"port\"> <type name=\"string\">"
+            "<length value=\"10 .. max\"/>"
+            "</type> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 1, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_true(range->parts[0].max_u64 == 18446744073709551615ull);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "10 .. max", NULL, NULL, NULL, 0, NULL);
+
+    /* TEST MODULE T1 */
+    schema = MODULE_CREATE_YIN("T1", "<leaf name=\"port\"> <type name=\"string\">"
+            "  <length value=\"min .. 20 | 50\"/>"
+            "</type></leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 0);
+    assert_int_equal(range->parts[0].max_u64, 20);
+    assert_int_equal(range->parts[1].min_u64, 50);
+    assert_int_equal(range->parts[1].max_u64, 50);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "min .. 20 | 50", NULL, NULL, NULL, 0, NULL);
+
+    /* TEST MODULE T2 */
+    schema = MODULE_CREATE_YIN("T2", "<leaf name=\"port\"> <type name=\"string\">"
+            "<length value=\"10 .. 20 | 50 .. 100 | 255\"/>"
+            "</type></leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 3, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_int_equal(range->parts[0].max_u64, 20);
+    assert_int_equal(range->parts[1].min_u64, 50);
+    assert_int_equal(range->parts[1].max_u64, 100);
+    assert_int_equal(range->parts[2].min_u64, 255);
+    assert_int_equal(range->parts[2].max_u64, 255);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "string", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "10 .. 20 | 50 .. 100 | 255", NULL, NULL, NULL, 0, NULL);
+
+    /* SUBTYPE MODULE T2 */
+    schema = MODULE_CREATE_YIN("TS0",
+            "<typedef name=\"my_type\">"
+            "    <type name=\"string\"> <length value=\"10 .. 20 | 50 .. 100 | 255\"/> </type>"
+            "</typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\">"
+            "    <length value=\"min .. 15 | max\"/>"
+            "</type> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 0);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 10);
+    assert_int_equal(range->parts[0].max_u64, 15);
+    assert_int_equal(range->parts[1].min_u64, 255);
+    assert_int_equal(range->parts[1].max_u64, 255);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x10, 0, 1, "my_type", 0, 0, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(lysp_leaf->type.length, "min .. 15 | max", NULL, NULL, NULL, 0, NULL);
+
+    /* ERROR TESTS NEGATIVE VALUE */
+    schema = MODULE_CREATE_YIN("ERR0", "<leaf name=\"port\"> <type name=\"string\">"
+            "<length value =\"-1 .. 20\"/> </type></leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - value \"-1\" does not fit the type limitations.",
+            "/ERR0:port");
+
+    schema = MODULE_CREATE_YIN("ERR1", "<leaf name=\"port\"> <type name=\"string\">"
+            "<length value=\"100 .. 18446744073709551616\"/>"
+            "</type> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - invalid value \"18446744073709551616\".",
+            "/ERR1:port");
+
+    schema = MODULE_CREATE_YIN("ERR2", "<leaf name=\"port\">"
+            "<type name=\"string\"> <length value=\"10 .. 20 | 20 .. 30\"/>"
+            "</type> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - values are not in ascending order (20).",
+            "/ERR2:port");
+
+    schema = MODULE_CREATE_YIN("ERR3",
+            "<typedef name=\"my_type\"> <type name=\"string\"/> </typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\"> <length value=\"-1 .. 15\"/>"
+            "</type> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Invalid length restriction - value \"-1\" does not fit the type limitations.",
+            "/ERR3:port");
+
+    /*
+     * PATTERN
+     */
+    schema = MODULE_CREATE_YIN("TPATTERN_0", "<leaf name=\"port\"> <type name=\"string\">"
+            "<pattern value=\"[a-zA-Z_][a-zA-Z0-9\\-_.]*\"/>"
+            "</type> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 1);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "string", 0, 1, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6""[a-zA-Z_][a-zA-Z0-9\\-_.]*", NULL, NULL, NULL, 0, NULL);
+
+    schema = MODULE_CREATE_YIN("TPATTERN_1", "<leaf name=\"port\"> <type name=\"string\">"
+            "   <pattern value=\"[a-zA-Z_][a-zA-Z0-9\\-_.]*\"/>"
+            "   <pattern value=\"abc.*\"> <modifier value=\"invert-match\"/> </pattern>"
+            "</type> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 2);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[1];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "abc.*", 0, 0x1, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "string", 0, 2, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6""[a-zA-Z_][a-zA-Z0-9\\-_.]*", NULL, NULL, NULL, 0, NULL);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[1]), "\x15""abc.*", NULL, NULL, NULL, 0, NULL);
+
+    schema = MODULE_CREATE_YIN("TPATTERN_2",
+            "<typedef name=\"my_type\">"
+            "   <type name=\"string\">"
+            "       <pattern value=\"[a-zA-Z_][a-zA-Z0-9\\-_.]*\"/>"
+            "       <pattern value=\"abc.*\"> <modifier value=\"invert-match\"/> </pattern>"
+            "</type> </typedef>"
+            "<leaf name=\"port\"><type name=\"my_type\"> <pattern value=\"bcd.*\"/> </type></leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 3);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[1];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "abc.*", 0, 0x1, NULL);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[2];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "bcd.*", 0, 0x0, NULL);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x40, 0, 0, "my_type", 0, 1, 1, 0, 0, 0);
+    CHECK_LYSP_RESTR(&(lysp_leaf->type.patterns[0]), "\x6""bcd.*", NULL, NULL, NULL, 0, NULL);
+
+    /*
+     * TEST pattern error
+     * */
+    schema = MODULE_CREATE_YIN("TPATTERN_ERR_0",
+            "<leaf name=\"port\"> <type name=\"string\">"
+            "   <pattern value=\"[a-zA-Z_][a-zA-Z0-9\\-_.*\"/>"
+            "</type> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+    CHECK_LOG_CTX("Regular expression \"[a-zA-Z_][a-zA-Z0-9\\-_.*\" is not valid (\"\": missing terminating ] for character class).",
+            "/TPATTERN_ERR_0:port");
+
+    /*
+     * DEFAUT VALUE
+     */
+    schema = MODULE_CREATE_YIN("TDEFAULT_0",
+            "<typedef name=\"my_type\">"
+            "   <type name=\"string\">"
+            "       <pattern value=\"[a-zA-Z_][a-zA-Z0-9\\-_.]*\"/>"
+            "       <length  value=\"2 .. 5 | 10\"/>"
+            "   </type>"
+            "   <default value=\"a1i-j\"/>"
+            "</typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\"/> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, "a1i-j");
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 1, 1);
+    pattern = ((struct lysc_type_str *)lysc_leaf->type)->patterns[0];
+    CHECK_LYSC_PATTERN(pattern, NULL, NULL, NULL, "[a-zA-Z_][a-zA-Z0-9\\-_.]*", 0, 0, NULL);
+    range = ((struct lysc_type_str *)lysc_leaf->type)->length;
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 2);
+    assert_int_equal(range->parts[0].max_u64, 5);
+    assert_int_equal(range->parts[1].min_u64, 10);
+    assert_int_equal(range->parts[1].max_u64, 10);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x0, 0, 0, "my_type", 0, 0, 1, 0, 0, 0);
+
+    schema = MODULE_CREATE_YIN("TDEFAULT_1",
+            "<typedef name=\"my_type\">"
+            "   <type name=\"string\">"
+            "   </type>"
+            "   <default value=\"a1i-j&lt;\"/>"
+            "</typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\"/> </leaf>");
+    UTEST_ADD_MODULE(schema, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    lysc_leaf = (void *) mod->compiled->data;
+    CHECK_LYSC_NODE_LEAF(lysc_leaf, NULL, 0, 0x5, 1, "port", 0, 0, 0, NULL, 0, 0, NULL, "a1i-j<");
+    CHECK_LYSC_TYPE_STR((struct lysc_type_str *)lysc_leaf->type, 0, 0, 0);
+    CHECK_LYSC_RANGE(range, NULL, NULL, NULL, 0, 2, NULL);
+    assert_int_equal(range->parts[0].min_u64, 2);
+    assert_int_equal(range->parts[0].max_u64, 5);
+    assert_int_equal(range->parts[1].min_u64, 10);
+    assert_int_equal(range->parts[1].max_u64, 10);
+    lysp_leaf = (void *) mod->parsed->data;
+    CHECK_LYSP_NODE_LEAF(lysp_leaf, NULL, 0, 0x0, 0, "port", 0, 0, NULL, 0, 0, NULL, NULL);
+    CHECK_LYSP_TYPE(&(lysp_leaf->type), 0, 0, 0, 0, 0, 0x0, 0, 0, "my_type", 0, 0, 1, 0, 0, 0);
+
+    schema = MODULE_CREATE_YIN("TDEFAULT_2",
+            "<typedef name=\"my_type\">"
+            "   <type name=\"string\">"
+            "       <length  value=\"2\"/>"
+            "   </type>"
+            "   <default value=\"a1i-j&lt;\"/>"
+            "</typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\"/> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+
+    schema = MODULE_CREATE_YIN("TDEFAULT_2",
+            "<typedef name=\"my_type\">"
+            "   <type name=\"string\">"
+            "       <length  value=\"2\"/>"
+            "   </type>"
+            "   <default value=\"a1i-j&lt;\"/>"
+            "</typedef>"
+            "<leaf name=\"port\"> <type name=\"my_type\"/> </leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+
+    schema = MODULE_CREATE_YIN("TDEFAULT_3",
+            "<typedef name=\"my_type\">"
+            "   <default value=\"a1i-j&lt;\"/>"
+            "   <type name=\"string\">"
+            "</type> </typedef>"
+            "<leaf name=\"port\"><type name=\"my_type\"> <pattern value=\"bcd.*\"/> </type></leaf>");
+    UTEST_INVALID_MODULE(schema, LYS_IN_YIN, NULL, LY_EVALID);
+
+}
+
+static void
+test_schema_print(void **state)
+{
+    const char *schema_yang, *schema_yin;
+    char *printed;
+    const struct lys_module *mod;
+
+    /* test print yang to yin */
+    schema_yang = MODULE_CREATE_YANG("PRINT0",
+            "leaf port {type string {"
+            "length \"min .. 20 | 50\";"
+            "pattern \"p.*\\\\\\\\\";"
+            "pattern 'p4.*' {modifier invert-match;}"
+            "}default \"p\\\"<\\\\\";}");
+    schema_yin = MODULE_CREATE_YIN("PRINT0",
+            "  <leaf name=\"port\">\n"
+            "    <type name=\"string\">\n"
+            "      <length value=\"min .. 20 | 50\"/>\n"
+            "      <pattern value=\"p.*\\\\\"/>\n"
+            "      <pattern value=\"p4.*\">\n"
+            "        <modifier value=\"invert-match\"/>\n"
+            "      </pattern>\n"
+            "    </type>\n"
+            "    <default value=\"p&quot;&lt;\\\"/>\n"
+            "  </leaf>\n");
+
+    UTEST_ADD_MODULE(schema_yang, LYS_IN_YANG, NULL, &mod);
+    assert_non_null(mod);
+    assert_int_equal(LY_SUCCESS, lys_print_mem(&printed, mod, LYS_OUT_YIN, 0));
+    assert_string_equal(printed, schema_yin);
+    free(printed);
+
+    /* test print yin to yang */
+    schema_yang = MODULE_CREATE_YANG("PRINT1",
+            "  leaf port {\n"
+            "    type string {\n"
+            "      length \"min .. 20 | 50\";\n"
+            "      pattern \"p.*\\\\\\\\\";\n"
+            "      pattern \"p4.*\" {\n"
+            "        modifier invert-match;\n"
+            "      }\n"
+            "    }\n"
+            "    default \"p\\\"<\\\\\";\n"
+            "  }\n");
+    schema_yin = MODULE_CREATE_YIN("PRINT1",
+            "  <leaf name=\"port\">\n"
+            "    <type name=\"string\">\n"
+            "      <length value=\"min .. 20 | 50\"/>\n"
+            "      <pattern value=\"p.*\\\\\"/>\n"
+            "      <pattern value=\"p4.*\">\n"
+            "        <modifier value=\"invert-match\"/>\n"
+            "      </pattern>\n"
+            "    </type>\n"
+            "    <default value=\"p&quot;&lt;\\\"/>\n"
+            "  </leaf>\n");
+
+    UTEST_ADD_MODULE(schema_yin, LYS_IN_YIN, NULL, &mod);
+    assert_non_null(mod);
+    assert_int_equal(LY_SUCCESS, lys_print_mem(&printed, mod, LYS_OUT_YANG, 0));
+    assert_string_equal(printed, schema_yang);
+    free(printed);
+}
+
+static void
+test_data_xml(void **state)
+{
+    const char *schema;
+    struct lyd_node *tree;
+    const char *data;
+    struct lysc_node_container *lysc_root;
+    struct lyd_node_inner *lyd_root;
+
+    /* NO RESTRICTION TESTS */
+    schema = MODULE_CREATE_YANG("T0", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    /* space on start and new line */
+    TEST_SUCCESS_XML("T0", " 50  \n\t 64", STRING, " 50  \n\t 64");
+    /* nuber as string */
+    TEST_SUCCESS_XML("T0", "50", STRING, "50");
+    TEST_SUCCESS_XML("T0", "+250", STRING, "+250");
+    /* references */
+    TEST_SUCCESS_XML("T0", "&quot;", STRING, "\"");
+    TEST_SUCCESS_XML("T0", "|&amp;|", STRING, "|&|");
+    TEST_SUCCESS_XML("T0", "&apos;", STRING, "'");
+    TEST_SUCCESS_XML("T0", "&lt;", STRING, "<");
+    TEST_SUCCESS_XML("T0", "&gt;", STRING, ">");
+    TEST_SUCCESS_XML("T0", "&#x42f;&#1071;", STRING, "ЯЯ");
+    /* special characters */
+    TEST_SUCCESS_XML("T0", "\"", STRING, "\"");
+    TEST_SUCCESS_XML("T0", "'", STRING, "'");
+    TEST_SUCCESS_XML("T0", ">", STRING, ">");
+    TEST_SUCCESS_XML("T0", "", STRING, "");
+    TEST_SUCCESS_XML("T0", "&amp;&lt;lt;", STRING, "&<lt;");
+    /* CDATA IS NOT SUPPORTED
+     * TEST_SUCCESS_XML("T2", "<![CDATA[<greeting>Hello, world! & Wecome</greeting>]]>", STRING,
+     *                        "<greeting>Hello, world! & Wecome</greeting>");
+     *  COMMENT IN MIDDLE OF TEXT IS NOT SUPPORTED
+     *  TEST_SUCCESS_XML("T2", "this isn't <!--' this is comment '-->comment",
+     *                 STRING, "this isn't comment");
+     */
+
+    /* error */
+    TEST_ERROR_XML("T0", "< df");
+    CHECK_LOG_CTX("Child element \"df\" inside a terminal node \"port\" found.",
+            "Schema location /T0:port, data location /T0:port, line number 1.");
+    TEST_ERROR_XML("T0", "&text;");
+    CHECK_LOG_CTX("Entity reference \"&text;</po\" not supported, only predefined references allowed.", "Line number 1.");
+    TEST_ERROR_XML("T0", "\"&#x8;\"");
+    CHECK_LOG_CTX("Invalid character reference \"&#x8;\"</port\" (0x00000008).", "Line number 1.");
+
+    /* TEST INVERTED PATTERN ADN LENGTH */
+    schema = MODULE_CREATE_YANG("T1", "leaf port {type string {"
+            "       length  \"5 .. 10 | 20\";"
+            "       pattern '[a-zA-Z_][a-zA-Z0-9\\-_.<]*' ;"
+            "       pattern 'p4.*' {modifier invert-match;}"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    /* inverted value */
+    TEST_SUCCESS_XML("T1", "abcde",    STRING, "abcde");
+    TEST_SUCCESS_XML("T1", "abcde&lt;", STRING, "abcde<");
+    TEST_ERROR_XML("T1", "p4abc");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"p4abc\" does not conform to inverted \"p4.*\".",
+            "Schema location /T1:port, line number 1.");
+    /* size 20 */
+    TEST_SUCCESS_XML("T1", "ahojahojahojahojahoj", STRING, "ahojahojahojahojahoj");
+    TEST_SUCCESS_XML("T1", "abc-de", STRING, "abc-de");
+    /* ERROR LENGTH  */
+    TEST_ERROR_XML("T1", "p4a&lt;");
+    CHECK_LOG_CTX("Unsatisfied length - string length \"4\" is not allowed.",
+            "Schema location /T1:port, line number 1.");
+
+    /* TEST DEFAULT VALUE */
+    schema = MODULE_CREATE_YANG("T2",
+            "container cont {\n"
+            "    leaf port {type string {length \"0 .. 50 | 105\";} default \"test\";}"
+            "}");
+    /* using default value */
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    data = "<cont xmlns=\"urn:tests:" "T2" "\">"  "</cont>";
+    CHECK_PARSE_LYD_PARAM(data, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);
+    lysc_root = (void *)tree->schema;
+    CHECK_LYSC_NODE(lysc_root->child, NULL, 0, 0x205, 1, "port", 0, LYS_LEAF, 1, 0, 0, 0);
+    lyd_root = ((struct lyd_node_inner *) tree);
+    CHECK_LYD_NODE_TERM((struct lyd_node_term *) lyd_root->child, 1, 0, 0, 1, 1,
+            STRING, "test");\
+    lyd_free_all(tree);
+
+    /* rewriting default value */
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    data = "<cont xmlns=\"urn:tests:T2\">" "<port> 52 </port>" "</cont>";
+    CHECK_PARSE_LYD_PARAM(data, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);
+    lysc_root = (void *)tree->schema;
+    CHECK_LYSC_NODE(lysc_root->child, NULL, 0, 0x205, 1, "port", 0, LYS_LEAF, 1, 0, 0, 0);
+    lyd_root = ((struct lyd_node_inner *) tree);
+    CHECK_LYD_NODE_TERM((struct lyd_node_term *) lyd_root->child, 0, 0, 0, 1, 1,
+            STRING, " 52 ");
+    lyd_free_all(tree);
+
+    /* WHIT STRING TEST */
+    schema = MODULE_CREATE_YANG("T_WHITE", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_SUCCESS_XML("T_WHITE", " \n\t", STRING, " \n\t");
+    TEST_SUCCESS_XML("T_WHITE", " \n&lt;\t", STRING, " \n<\t");
+
+    /* UTF-8 length and pattern*/
+    schema = MODULE_CREATE_YANG("T_UTF8", "leaf port {type string {"
+            "       length  \"5 .. 10\";"
+            "       pattern '[€]{5,7}' ;"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_SUCCESS_XML("T_UTF8", "€€€€€",    STRING, "€€€€€");
+    TEST_ERROR_XML("T_UTF8", "€€€");
+    CHECK_LOG_CTX("Unsatisfied length - string length \"3\" is not allowed.",
+            "Schema location /T_UTF8:port, line number 1.");
+    TEST_ERROR_XML("T_UTF8", "€€€€€€€€");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"€€€€€€€€\" does not conform to \"[€]{5,7}\".",
+            "Schema location /T_UTF8:port, line number 1.");
+
+    /* ANCHOR TEST ^$ is implicit */
+    schema = MODULE_CREATE_YANG("T_ANCHOR", "leaf port {type string {"
+            "       pattern 'a.*b' ;"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_ERROR_XML("T_ANCHOR", "abc");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"abc\" does not conform to \"a.*b\".",
+            "Schema location /T_ANCHOR:port, line number 1.");
+    TEST_ERROR_XML("T_ANCHOR", "cb");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"cb\" does not conform to \"a.*b\".",
+            "Schema location /T_ANCHOR:port, line number 1.");
+}
+
+static void
+test_data_json(void **state)
+{
+    const char *schema;
+    struct lyd_node *tree;
+    const char *data;
+    struct lysc_node_container *lysc_root;
+    struct lyd_node_inner *lyd_root;
+
+    /* NO RESTRICTION TESTS */
+    schema = MODULE_CREATE_YANG("T0", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_SUCCESS_JSON("T0", "this is text", STRING, "this is text");
+    /* space on start and new line */
+    TEST_SUCCESS_JSON("T0", " 50  \\n\\t 64", STRING, " 50  \n\t 64");
+    /* nuber as string */
+    TEST_SUCCESS_JSON("T0", "50", STRING, "50");
+    TEST_SUCCESS_JSON("T0", "+250", STRING, "+250");
+    /* references */
+    TEST_SUCCESS_JSON("T0", "\\\"", STRING, "\"");
+    TEST_SUCCESS_JSON("T0", "|&|", STRING, "|&|");
+    TEST_SUCCESS_JSON("T0", "<", STRING, "<");
+    TEST_SUCCESS_JSON("T0", ">", STRING, ">");
+    TEST_SUCCESS_JSON("T0", "\\u042F", STRING, "Я");
+    TEST_SUCCESS_JSON("T0", "\\u042FFF", STRING, "ЯFF");
+    /* special characters */
+    TEST_SUCCESS_JSON("T0", "'", STRING, "'");
+    TEST_SUCCESS_JSON("T0", ">", STRING, ">");
+    TEST_SUCCESS_JSON("T0", "", STRING, "");
+    TEST_SUCCESS_JSON("T0", "\\\" \\\\ \\r \\/ \\n \\t \\u20ac", STRING, "\" \\ \r / \n \t €");
+
+    /* ERROR invalid json string */
+    TEST_ERROR_JSON("T0", "\n");
+    CHECK_LOG_CTX("Invalid character in JSON string \"\n\" (0x0000000a).",
+            "Line number 1.");
+    /* backspace and form feed are valid JSON escape sequences, but the control characters they represents are not allowed values for YANG string type */
+    TEST_ERROR_JSON("T0", "\\b");
+    CHECK_LOG_CTX("Invalid character reference \"\\b\" (0x00000008).", "Line number 1.");
+
+    TEST_ERROR_JSON("T0", "\\f");
+    CHECK_LOG_CTX("Invalid character reference \"\\f\" (0x0000000c).", "Line number 1.");
+
+    TEST_ERROR_JSON("T0", "\"");
+    CHECK_LOG_CTX("Unexpected character \"\"\" after JSON string.", "Line number 1.");
+
+    TEST_ERROR_JSON("T0", "aabb \\x");
+    CHECK_LOG_CTX("Invalid character escape sequence \\x.", "Line number 1.");
+
+    /* TEST INVERTED PATTERN ADN LENGTH */
+    schema = MODULE_CREATE_YANG("T1", "leaf port {type string {"
+            "       length  \"5 .. 10 | 20\";"
+            "       pattern '[a-zA-Z_][a-zA-Z0-9\\-_.<]*\\n[a-zA-Z0-9\\-_.<]*' ;"
+            "       pattern 'p4.*\\n' {modifier invert-match;}"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    /* inverted value */
+    TEST_SUCCESS_JSON("T1", "a\\nbcde",     STRING, "a\nbcde");
+    TEST_ERROR_JSON("T1", "p4abc\\n");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"p4abc\n\" does not conform to inverted \"p4.*\\n\".",
+            "Schema location /T1:port, line number 1.");
+    /* size 20 */
+    TEST_SUCCESS_JSON("T1", "ahojahojaho\\njahojaho", STRING, "ahojahojaho\njahojaho");
+    TEST_SUCCESS_JSON("T1", "abc\\n-de", STRING, "abc\n-de");
+    /* ERROR LENGTH  */
+    TEST_ERROR_JSON("T1", "p4a\u042F");
+    CHECK_LOG_CTX("Unsatisfied length - string length \"4\" is not allowed.",
+            "Schema location /T1:port, line number 1.");
+
+    /* TEST DEFAULT VALUE */
+    schema = MODULE_CREATE_YANG("T_DEFAULT2",
+            "container cont {\n"
+            "    leaf port {type string {length \"0 .. 50 | 105\";} default \"test\";}"
+            "}");
+    /* using default value */
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    data = "{\"T_DEFAULT2:cont\":{}}";
+    CHECK_PARSE_LYD_PARAM(data, LYD_JSON, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);
+    lysc_root = (void *)tree->schema;
+    CHECK_LYSC_NODE(lysc_root->child, NULL, 0, 0x205, 1, "port", 0, LYS_LEAF, 1, 0, 0, 0);
+    lyd_root = ((struct lyd_node_inner *) tree);
+    CHECK_LYD_NODE_TERM((struct lyd_node_term *) lyd_root->child, 1, 0, 0, 1, 1,
+            STRING, "test");\
+    lyd_free_all(tree);
+
+    /* rewriting default value */
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    data = "{\"T_DEFAULT2:cont\":{\":port\": \" 52 \"}}";\
+    CHECK_PARSE_LYD_PARAM(data, LYD_JSON, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, tree);
+    lysc_root = (void *)tree->schema;
+    CHECK_LYSC_NODE(lysc_root->child, NULL, 0, 0x205, 1, "port", 0, LYS_LEAF, 1, 0, 0, 0);
+    lyd_root = ((struct lyd_node_inner *) tree);
+    CHECK_LYD_NODE_TERM((struct lyd_node_term *) lyd_root->child, 0, 0, 0, 1, 1,
+            STRING, " 52 ");
+    lyd_free_all(tree);
+
+    /* UTF-8 length and pattern*/
+    schema = MODULE_CREATE_YANG("T_UTF8", "leaf port {type string {"
+            "       length  \"5 .. 10\";"
+            "       pattern '[€]{5,7}' ;"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_SUCCESS_JSON("T_UTF8", "€€€€€",    STRING, "€€€€€");
+    TEST_ERROR_JSON("T_UTF8", "€€€");
+    CHECK_LOG_CTX("Unsatisfied length - string length \"3\" is not allowed.",
+            "Schema location /T_UTF8:port, line number 1.");
+    TEST_ERROR_JSON("T_UTF8", "€€€€€€€€");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"€€€€€€€€\" does not conform to \"[€]{5,7}\".",
+            "Schema location /T_UTF8:port, line number 1.");
+
+    /* ANCHOR TEST ^$ is implicit */
+    schema = MODULE_CREATE_YANG("T_ANCHOR", "leaf port {type string {"
+            "       pattern 'a.*b' ;"
+            "}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    TEST_ERROR_JSON("T_ANCHOR", "abc");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"abc\" does not conform to \"a.*b\".",
+            "Schema location /T_ANCHOR:port, line number 1.");
+    TEST_ERROR_JSON("T_ANCHOR", "cb");
+    CHECK_LOG_CTX("Unsatisfied pattern - \"cb\" does not conform to \"a.*b\".",
+            "Schema location /T_ANCHOR:port, line number 1.");
+}
+
+static void
+test_diff(void **state)
+{
+    (void) state;
+    const char *schema;
+
+    schema = MODULE_CREATE_YANG("T_DIFF", "leaf port {type string {length \"6 .. 50 | 120\";}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+
+    struct lyd_node *model_1, *model_2;
+    struct lyd_node *diff;
+    const char *data_1 = "<port xmlns=\"urn:tests:T_DIFF\"> text abc &lt; </port>";
+    const char *data_2 = "<port xmlns=\"urn:tests:T_DIFF\"> text abc &gt; </port>";
+    const char *diff_expected = "<port xmlns=\"urn:tests:T_DIFF\""
+            " xmlns:yang=\"urn:ietf:params:xml:ns:yang:1\""
+            " yang:operation=\"replace\" yang:orig-default=\"false\""
+            " yang:orig-value=\" text abc &lt; \"> text abc &gt; </port>";
+
+    CHECK_PARSE_LYD_PARAM(data_1, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_1);
+    CHECK_PARSE_LYD_PARAM(data_2, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_2);
+    assert_int_equal(LY_SUCCESS, lyd_diff_siblings(model_1, model_2, 0, &diff));
+    assert_non_null(diff);
+    CHECK_LYD_STRING_PARAM(diff, diff_expected, LYD_XML, LYD_PRINT_WITHSIBLINGS | LYD_PRINT_SHRINK);
+    assert_int_equal(LY_SUCCESS, lyd_diff_apply_all(&model_1, diff));
+    CHECK_LYD(model_1, model_2);
+    lyd_free_all(model_1);
+    lyd_free_all(model_2);
+    lyd_free_all(diff);
+
+    /* create data from diff */
+    diff_expected = "<port xmlns=\"urn:tests:T_DIFF\""
+            " xmlns:yang=\"urn:ietf:params:xml:ns:yang:1\""
+            " yang:operation=\"replace\" yang:orig-default=\"false\""
+            " yang:orig-value=\" 10^20 \">jjjjjjj</port>";
+
+    CHECK_PARSE_LYD_PARAM(diff_expected, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, diff);
+    data_1 = "<port xmlns=\"urn:tests:T_DIFF\"> 10^20 </port>";
+    CHECK_PARSE_LYD_PARAM(data_1, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_1);
+    assert_int_equal(LY_SUCCESS, lyd_diff_apply_all(&model_1, diff));
+    const char *expected = "<port xmlns=\"urn:tests:T_DIFF\">jjjjjjj</port>";
+
+    CHECK_LYD_STRING_PARAM(model_1, expected, LYD_XML, LYD_PRINT_WITHSIBLINGS | LYD_PRINT_SHRINK);
+    lyd_free_all(model_1);
+    lyd_free_all(diff);
+
+    /* check creating data breaking restrictions */
+    diff_expected = "<port xmlns=\"urn:tests:T_DIFF\" "
+            "xmlns:yang=\"urn:ietf:params:xml:ns:yang:1\" "
+            "yang:operation=\"replace\" yang:orig-default=\"false\" yang:orig-value=\" 555 555\">"
+            "121</port>";
+    CHECK_PARSE_LYD_PARAM(diff_expected, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_EVALID, model_1);
+    CHECK_LOG_CTX("Unsatisfied length - string length \"3\" is not allowed.",
+            "Schema location /T_DIFF:port, line number 1.");
+
+    /* diff from default value */
+    data_1 = "<cont xmlns=\"urn:tests:T_DIFF1\"></cont>";
+    data_2 = "<cont xmlns=\"urn:tests:T_DIFF1\"> <port> 6 </port> </cont>";
+    diff_expected = "<cont xmlns=\"urn:tests:T_DIFF1\""
+            " xmlns:yang=\"urn:ietf:params:xml:ns:yang:1\""
+            " yang:operation=\"create\"><port> 6 </port></cont>";
+
+    schema = MODULE_CREATE_YANG("T_DIFF1",
+            "container cont {\n"
+            "    leaf port {type string; default \" 20\n30 \";}"
+            "}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+    CHECK_PARSE_LYD_PARAM(data_1, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_1);
+    CHECK_PARSE_LYD_PARAM(data_2, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_2);
+    assert_int_equal(LY_SUCCESS, lyd_diff_siblings(model_1, model_2, 0, &diff));
+    assert_non_null(diff);
+    CHECK_LYD_STRING_PARAM(diff, diff_expected, LYD_XML, LYD_PRINT_WITHSIBLINGS | LYD_PRINT_SHRINK);
+    assert_int_equal(LY_SUCCESS, lyd_diff_apply_all(&model_1, diff));
+    CHECK_LYD(model_1, model_2);
+    lyd_free_all(diff);
+
+    lyd_free_all(model_1);
+    lyd_free_all(model_2);
+}
+
+static void
+test_print(void **state)
+{
+    (void) state;
+    const char *schema;
+
+    schema = MODULE_CREATE_YANG("T_PRINT", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, NULL);
+
+    struct lyd_node *model_1;
+    const char *data_1 = "<port xmlns=\"urn:tests:T_PRINT\"> &lt; hello &gt;  </port>";
+
+    CHECK_PARSE_LYD_PARAM(data_1, LYD_XML, 0, LYD_VALIDATE_PRESENT, LY_SUCCESS, model_1);
+
+    /* XML */
+    const char *expected_xml = "<port xmlns=\"urn:tests:T_PRINT\"> &lt; hello &gt;  </port>";
+
+    CHECK_LYD_STRING_PARAM(model_1, expected_xml, LYD_XML, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS | LYD_PRINT_SHRINK);
+
+    /* JSON */
+    const char *expected_json = "{\"T_PRINT:port\":\" < hello >  \"}";
+
+    CHECK_LYD_STRING_PARAM(model_1, expected_json, LYD_JSON, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS | LYD_PRINT_SHRINK);
+
+    lyd_free_all(model_1);
+}
+
+static void
+test_plugin_store(void **state)
+{
+    (void) state;
+
+    const char *val_text = NULL;
+    struct ly_err_item *err = NULL;
+    const struct lys_module *mod;
+    struct lyd_value value = {0};
+    struct lysc_type_plugin *type = &(ly_builtin_type_plugins[LY_TYPE_STRING]);
+    struct lysc_type *lysc_type;
+    char *alloc_text;
+    unsigned int alloc_text_size;
+    LY_ERR ly_ret;
+    const char *schema;
+
+    schema = MODULE_CREATE_YANG("T0", "leaf port {type string {length \"0 .. 10\";"
+            "pattern '[0-9\\n<>\\\"\\|]*' ;}}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    lysc_type = ((struct lysc_node_leaf *) mod->compiled->data)->type;
+
+    /* check proper type */
+    assert_int_equal(LY_TYPE_STRING, type->type);
+    assert_string_equal("libyang 2 - string, version 1", type->id);
+
+    /* check store */
+    val_text = "20";
+    assert_int_equal(LY_SUCCESS, type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err));
+    CHECK_LYD_VALUE(value, STRING, "20");
+    assert_ptr_equal(value.realtype, lysc_type);
+    type->free(UTEST_LYCTX, &value);
+
+    val_text = "150\n";
+    assert_int_equal(LY_SUCCESS, type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err));
+    CHECK_LYD_VALUE(value, STRING, "150\n");
+    assert_ptr_equal(value.realtype, lysc_type);
+    type->free(UTEST_LYCTX, &value);
+
+    val_text = "<\"150>\n";
+    assert_int_equal(LY_SUCCESS, type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err));
+    CHECK_LYD_VALUE(value, STRING, "<\"150>\n");
+    assert_ptr_equal(value.realtype, lysc_type);
+    type->free(UTEST_LYCTX, &value);
+
+    val_text = "<\"150>\n|hi how are you";
+    assert_int_equal(LY_SUCCESS, type->store(UTEST_LYCTX, lysc_type, val_text, 8,
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err));
+    CHECK_LYD_VALUE(value, STRING, "<\"150>\n|");
+    assert_ptr_equal(value.realtype, lysc_type);
+    type->free(UTEST_LYCTX, &value);
+
+    val_text = "";
+    assert_int_equal(LY_SUCCESS, type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err));
+    CHECK_LYD_VALUE(value, STRING, "");
+    assert_ptr_equal(value.realtype, lysc_type);
+    type->free(UTEST_LYCTX, &value);
+
+    /*
+     * minor tests
+     * dynamic alocated input text
+     */
+    val_text = "<250>";
+    alloc_text_size = strlen(val_text);
+    alloc_text = (char *) malloc(alloc_text_size + 1);
+    memcpy(alloc_text, val_text, alloc_text_size + 1);
+
+    ly_ret = type->store(UTEST_LYCTX, lysc_type, alloc_text, alloc_text_size,
+            LY_TYPE_STORE_DYNAMIC, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err);
+    alloc_text = NULL;
+    assert_int_equal(LY_SUCCESS, ly_ret);
+    CHECK_LYD_VALUE(value, STRING, "<250>");
+    type->free(UTEST_LYCTX, &value);
+
+    /* wrong lysc_type of value */
+    struct lysc_type lysc_type_test = *lysc_type;
+
+    lysc_type_test.basetype = LY_TYPE_UINT8;
+    val_text = "20";
+    ly_ret = type->store(UTEST_LYCTX, &lysc_type_test, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err);
+    assert_int_equal(LY_EVALID, ly_ret);
+    ly_err_free(err);
+
+    /* ERROR TESTS */
+
+    val_text = "10 \"| bcdei";
+    err = NULL;
+    ly_ret = type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err);
+    assert_int_equal(LY_EVALID, ly_ret);
+    ly_err_free(err);
+
+    val_text = "012345678901";
+    err = NULL;
+    ly_ret = type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &value, NULL, &err);
+    assert_int_equal(LY_EVALID, ly_ret);
+    ly_err_free(err);
+
+    val_text = "10";
+    err = NULL;
+    ly_ret = type->store(UTEST_LYCTX, lysc_type, val_text, strlen(val_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_DECNUM, NULL, &value, NULL, &err);
+    assert_int_equal(LY_EVALID, ly_ret);
+    ly_err_free(err);
+
+}
+
+static void
+test_plugin_compare(void **state)
+{
+    struct ly_err_item *err = NULL;
+    const struct lys_module *mod;
+    struct lyd_value values[10];
+    struct lysc_type_plugin *type = &(ly_builtin_type_plugins[LY_TYPE_STRING]);
+    struct lysc_type *lysc_type;
+    LY_ERR ly_ret;
+    const char *schema;
+
+    /* different type */
+    const char *diff_type_text = "20";
+    struct lyd_value  diff_type_val;
+    struct lysc_type *diff_type;
+
+    /* create schema. Prepare common used variables */
+    schema = MODULE_CREATE_YANG("T0", "typedef my_int_type {type string; }"
+            "leaf p1 {type my_int_type;}"
+            "leaf p2 {type my_int_type;}"
+            "leaf p3 {type string;}"
+            "leaf p4 {type uint8;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    lysc_type = ((struct lysc_node_leaf *) mod->compiled->data)->type;
+
+    /* CREATE VALUES */
+    const char *val_init[] = {"hi", "hello", "hi", "hello", "hell", "hh"};
+
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        ly_ret = type->store(UTEST_LYCTX, lysc_type, val_init[it], strlen(val_init[it]),
+                0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &(values[it]), NULL, &err);
+        assert_int_equal(LY_SUCCESS, ly_ret);
+    }
+
+    /*  BASIC TEST; */
+    assert_int_equal(LY_SUCCESS, type->compare(&(values[0]), &(values[0])));
+    assert_int_equal(LY_SUCCESS, type->compare(&(values[0]), &(values[2])));
+    assert_int_equal(LY_ENOT, type->compare(&(values[0]), &(values[1])));
+    assert_int_equal(LY_ENOT, type->compare(&(values[1]), &(values[0])));
+    assert_int_equal(LY_ENOT, type->compare(&(values[1]), &(values[2])));
+    assert_int_equal(LY_SUCCESS, type->compare(&(values[1]), &(values[3])));
+
+    /* SAME TYPE but different node */
+    diff_type_text = "hi";
+    diff_type = ((struct lysc_node_leaf *) mod->compiled->data->next)->type;
+    ly_ret = diff_type->plugin->store(UTEST_LYCTX, diff_type, diff_type_text, strlen(diff_type_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &diff_type_val, NULL, &err);
+    assert_int_equal(LY_SUCCESS, ly_ret);
+    assert_int_equal(diff_type->plugin->type, LY_TYPE_STRING);
+    assert_int_equal(LY_SUCCESS, type->compare(&diff_type_val, &(values[0])));
+    assert_int_equal(LY_ENOT, type->compare(&diff_type_val, &(values[1])));
+    type->free(UTEST_LYCTX, &(diff_type_val));
+
+    /* original type  */
+    diff_type_text = "hi";
+    diff_type = ((struct lysc_node_leaf *) mod->compiled->data->next->next)->type;
+    ly_ret = diff_type->plugin->store(UTEST_LYCTX, diff_type, diff_type_text, strlen(diff_type_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &diff_type_val, NULL, &err);
+    assert_int_equal(LY_SUCCESS, ly_ret);
+    assert_int_equal(diff_type->plugin->type, LY_TYPE_STRING);
+    assert_int_equal(LY_ENOT, type->compare(&diff_type_val, &(values[0])));
+    assert_int_equal(LY_ENOT, type->compare(&diff_type_val, &(values[1])));
+    type->free(UTEST_LYCTX, &(diff_type_val));
+
+    /* different type (UINT8) */
+    diff_type_text = "20";
+    diff_type = ((struct lysc_node_leaf *) mod->compiled->data->next->next->next)->type;
+    ly_ret = diff_type->plugin->store(UTEST_LYCTX, diff_type, diff_type_text, strlen(diff_type_text),
+            0, LY_PREF_XML, NULL, LYD_VALHINT_DECNUM, NULL, &diff_type_val, NULL, &err);
+    assert_int_equal(LY_SUCCESS, ly_ret);
+    assert_int_equal(diff_type->plugin->type, LY_TYPE_UINT8);
+    assert_int_equal(LY_ENOT, type->compare(&diff_type_val, &(values[0])));
+    assert_int_equal(LY_ENOT, type->compare(&diff_type_val, &(values[1])));
+    type->free(UTEST_LYCTX, &(diff_type_val));
+
+    /* delete values */
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        type->free(UTEST_LYCTX, &(values[it]));
+    }
+}
+
+static void
+test_plugin_print(void **state)
+{
+    struct ly_err_item *err = NULL;
+    const struct lys_module *mod;
+    struct lyd_value values[10];
+    struct lysc_type_plugin *type = &(ly_builtin_type_plugins[LY_TYPE_STRING]);
+    struct lysc_type *lysc_type;
+    LY_ERR ly_ret;
+
+    /* create schema. Prepare common used variables */
+    const char *schema = MODULE_CREATE_YANG("defs", "leaf port {type string;}");
+
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    lysc_type = ((struct lysc_node_leaf *) mod->compiled->data)->type;
+
+    /* CREATE VALUES */
+    const char *val_init[] = {"20", "0x4A", "<|>", "\""};
+
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        ly_ret = type->store(UTEST_LYCTX, lysc_type, val_init[it], strlen(val_init[it]),
+                0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &(values[it]), NULL, &err);
+        assert_int_equal(LY_SUCCESS, ly_ret);
+    }
+
+    /* print value */
+    ly_bool dynamic = 0;
+
+    assert_string_equal("20", type->print(&(values[0]), LY_PREF_XML, NULL, &dynamic));
+    assert_string_equal("0x4A", type->print(&(values[1]), LY_PREF_XML, NULL, &dynamic));
+    assert_string_equal("<|>", type->print(&(values[2]), LY_PREF_XML, NULL, &dynamic));
+    assert_string_equal("\"", type->print(&(values[3]), LY_PREF_XML, NULL, &dynamic));
+
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        type->free(UTEST_LYCTX, &(values[it]));
+    }
+}
+
+static void
+test_plugin_dup(void **state)
+{
+
+    struct ly_err_item *err = NULL;
+    const struct lys_module *mod;
+    struct lyd_value values[10];
+    struct lysc_type_plugin *type = &(ly_builtin_type_plugins[LY_TYPE_STRING]);
+    struct lysc_type *lysc_type[2];
+    const char *schema;
+    LY_ERR ly_ret;
+
+    /* create schema. Prepare common used variables */
+    schema = MODULE_CREATE_YANG("T0", "leaf port {type string;}");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    lysc_type[0] = ((struct lysc_node_leaf *) mod->compiled->data)->type;
+
+    schema = MODULE_CREATE_YANG("T1",
+            "typedef my_int_type {"
+            "    type string {length \"1 .. 100\";} default 20;"
+            "}"
+            "leaf port {type my_int_type; }");
+    UTEST_ADD_MODULE(schema, LYS_IN_YANG, NULL, &mod);
+    lysc_type[1] = ((struct lysc_node_leaf *) mod->compiled->data)->type;
+
+    /* CREATE VALUES */
+    const char *val_init[] = {"20", "0x4A", "<\">", "0x4A"};
+
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        ly_ret = type->store(UTEST_LYCTX, lysc_type[it % 2], val_init[it], strlen(val_init[it]),
+                0, LY_PREF_XML, NULL, LYD_VALHINT_STRING, NULL, &(values[it]), NULL, &err);
+        assert_int_equal(LY_SUCCESS, ly_ret);
+    }
+
+    /* print duplicate value */
+    struct lyd_value dup_value;
+
+    assert_int_equal(LY_SUCCESS, type->duplicate(UTEST_LYCTX, &(values[0]), &dup_value));
+    CHECK_LYD_VALUE(dup_value, STRING, "20");
+    assert_ptr_equal(dup_value.realtype, values[0].realtype);
+    type->free(UTEST_LYCTX, &dup_value);
+
+    assert_int_equal(LY_SUCCESS, type->duplicate(UTEST_LYCTX, &(values[1]), &dup_value));
+    CHECK_LYD_VALUE(dup_value, STRING, "0x4A");
+    assert_ptr_equal(dup_value.realtype, values[1].realtype);
+    type->free(UTEST_LYCTX, &dup_value);
+
+    assert_int_equal(LY_SUCCESS, type->duplicate(UTEST_LYCTX, &(values[2]), &dup_value));
+    CHECK_LYD_VALUE(dup_value, STRING, "<\">");
+    assert_ptr_equal(dup_value.realtype, values[2].realtype);
+    type->free(UTEST_LYCTX, &dup_value);
+
+    assert_int_equal(LY_SUCCESS, type->duplicate(UTEST_LYCTX, &(values[3]), &dup_value));
+    CHECK_LYD_VALUE(dup_value, STRING, "0x4A");
+    assert_ptr_equal(dup_value.realtype, values[3].realtype);
+    type->free(UTEST_LYCTX, &dup_value);
+
+    /* error tests */
+    assert_int_equal(LY_EINVAL, type->duplicate(NULL, &(values[0]), &dup_value));
+
+    for (int unsigned it = 0; it < sizeof(val_init) / sizeof(val_init[0]); it++) {
+        type->free(UTEST_LYCTX, &(values[it]));
+    }
+}
+
+int
+main(void)
+{
+    const struct CMUnitTest tests[] = {
+        UTEST(test_schema_yang),
+        UTEST(test_schema_yin),
+        UTEST(test_schema_print),
+        UTEST(test_data_xml),
+        UTEST(test_data_json),
+        UTEST(test_diff),
+        UTEST(test_print),
+
+        UTEST(test_plugin_store),
+        UTEST(test_plugin_compare),
+        UTEST(test_plugin_print),
+        UTEST(test_plugin_dup),
+    };
+
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}