yanglint TEST option make-implemented
diff --git a/tools/lint/tests/modules/modmust.yang b/tools/lint/tests/modules/modmust.yang
new file mode 100644
index 0000000..99971bd
--- /dev/null
+++ b/tools/lint/tests/modules/modmust.yang
@@ -0,0 +1,13 @@
+module modmust {
+  namespace "urn:yanglint:modmust";
+  prefix m;
+
+  import modleaf {
+    prefix ml;
+  }
+
+  leaf lfm {
+    type string;
+    must "/ml:lfl > 0";
+  }
+}