yanglint TEST merge data via -m
diff --git a/tools/lint/tests/interactive/data_merge.test b/tools/lint/tests/interactive/data_merge.test
new file mode 100644
index 0000000..f09f879
--- /dev/null
+++ b/tools/lint/tests/interactive/data_merge.test
@@ -0,0 +1,20 @@
+source [expr {[info exists ::env(TESTS_DIR)] ? "$env(TESTS_DIR)/interactive/ly.tcl" : "ly.tcl"}]
+
+set ddir "$::env(TESTS_DIR)/data"
+
+test data_merge_basic {Data is merged and the node is added} {
+-setup $ly_setup -cleanup $ly_cleanup -body {
+ ly_cmd "load modmerge"
+ ly_cmd "data -m -f xml $ddir/modmerge.xml $ddir/modmerge3.xml" "<en>.*<lm>.*<lf>"
+}}
+
+test data_merge_validation_failed {Data is merged but validation failed.} {
+-setup $ly_setup -cleanup $ly_cleanup -body {
+ ly_cmd "load modmerge"
+ ly_cmd "data $ddir/modmerge.xml"
+ ly_cmd "data $ddir/modmerge2.xml"
+ ly_cmd "data -m $ddir/modmerge2.xml $ddir/modmerge.xml"
+ ly_cmd_err "data -m $ddir/modmerge.xml $ddir/modmerge2.xml" "Merged data are not valid"
+}}
+
+cleanupTests