testdata: add manifestJsonEx array test case

This commit adds a test case to prevent regressions in
std.manifestJsonEx accepting arrays as values.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

testdata/builtinManifestJsonEx.golden

@@ -1 +1,4 @@
-"{\n  \"bam\": true,\n  \"bar\": \"bar\",\n  \"baz\": 1,\n  \"bazel\": 1.42,\n  \"bim\": false,\n  \"blamo\": {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  },\n  \"boom\": -1,\n  \"foo\": \"bar\"\n}"
+{
+   "a": "{\n  \"bam\": true,\n  \"bar\": \"bar\",\n  \"baz\": 1,\n  \"bazel\": 1.42,\n  \"bim\": false,\n  \"blamo\": {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  },\n  \"boom\": -1,\n  \"foo\": \"bar\"\n}",
+   "b": "[\n  \"bar\",\n  \"bar\",\n  1,\n  1.42,\n  -1,\n  false,\n  true,\n  {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  }\n]"
+}

testdata/builtinManifestJsonEx.jsonnet

@@ -1,5 +1,5 @@
 local a = {
-    foo: "bar",
+  foo: 'bar',
   bar: self.foo,
   baz: 1,
   bazel: 1.42,
@@ -8,15 +8,39 @@ local a = {
   bam: true,
   blamo: {
     cereal: [
-            "<>& fizbuzz",
+      '<>& fizbuzz',
     ],
 
     treats: [
       {
-                name: "chocolate",
+        name: 'chocolate',
-            }
+      },
     ],
-    }
+  },
 };
 
-std.manifestJsonEx(a, "  ")
+local b = [
+  'bar',
+  a.foo,
+  1,
+  1.42,
+  -1,
+  false,
+  true,
+  {
+    cereal: [
+      '<>& fizbuzz',
+    ],
+
+    treats: [
+      {
+        name: 'chocolate',
+      },
+    ],
+  },
+];
+
+{
+  a: std.manifestJsonEx(a, '  '),
+  b: std.manifestJsonEx(b, '  '),
+}