diff --git a/tests/test-sources/modules/diagnostics.nix b/tests/test-sources/modules/diagnostics.nix
new file mode 100644
index 00000000..dfa50ac5
--- /dev/null
+++ b/tests/test-sources/modules/diagnostics.nix
@@ -0,0 +1,8 @@
+{
+  example = {
+    diagnostics = {
+      virtual_text = false;
+      virtual_lines.only_current_line = true;
+    };
+  };
+}