diff --git a/testdata/native6.golden b/testdata/native6.golden
new file mode 100644
index 0000000..71829ad
--- /dev/null
+++ b/testdata/native6.golden
@@ -0,0 +1 @@
+"{}"
diff --git a/testdata/native6.jsonnet b/testdata/native6.jsonnet
new file mode 100644
index 0000000..42eb354
--- /dev/null
+++ b/testdata/native6.jsonnet
@@ -0,0 +1 @@
+std.native("jsonToString")(x={})
diff --git a/testdata/native7.golden b/testdata/native7.golden
new file mode 100644
index 0000000..25e2a3e
--- /dev/null
+++ b/testdata/native7.golden
@@ -0,0 +1,10 @@
+RUNTIME ERROR: Function has no parameter y
+-------------------------------------------------
+	testdata/native7:1:1-33	$
+
+std.native("jsonToString")(y={})
+
+-------------------------------------------------
+	During evaluation	
+
+
diff --git a/testdata/native7.jsonnet b/testdata/native7.jsonnet
new file mode 100644
index 0000000..c00add3
--- /dev/null
+++ b/testdata/native7.jsonnet
@@ -0,0 +1 @@
+std.native("jsonToString")(y={})