yanglint TEST merge data via -m
diff --git a/tools/lint/tests/non-interactive/data_merge.test b/tools/lint/tests/non-interactive/data_merge.test
new file mode 100644
index 0000000..b8e582c
--- /dev/null
+++ b/tools/lint/tests/non-interactive/data_merge.test
@@ -0,0 +1,17 @@
+source [expr {[info exists ::env(TESTS_DIR)] ? "$env(TESTS_DIR)/non-interactive/ly.tcl" : "ly.tcl"}]
+
+set mdir $::env(YANG_MODULES_DIR)
+set ddir $::env(TESTS_DIR)/data
+
+test data_merge_basic {Data is merged and the node is added} {
+ ly_cmd "-m -f xml $mdir/modmerge.yang $ddir/modmerge.xml $ddir/modmerge3.xml" "<en>.*<lm>.*<lf>"
+} {}
+
+test data_merge_validation_failed {Data is merged but validation failed.} {
+ ly_cmd "$mdir/modmerge.yang $ddir/modmerge.xml"
+ ly_cmd "$mdir/modmerge.yang $ddir/modmerge2.xml"
+ ly_cmd "-m $mdir/modmerge.yang $ddir/modmerge2.xml $ddir/modmerge.xml"
+ ly_cmd_err "-m $mdir/modmerge.yang $ddir/modmerge.xml $ddir/modmerge2.xml" "Merged data are not valid"
+} {}
+
+cleanupTests