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>

Author: squat

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

@@ -1,22 +1,46 @@
 local a = {
-    foo: "bar",
-    bar: self.foo,
-    baz: 1,
-    bazel: 1.42,
-    boom: -1,
-    bim: false,
-    bam: true,
-    blamo: {
-        cereal: [
-            "<>& fizbuzz",
-        ],
+  foo: 'bar',
+  bar: self.foo,
+  baz: 1,
+  bazel: 1.42,
+  boom: -1,
+  bim: false,
+  bam: true,
+  blamo: {
+    cereal: [
+      '<>& fizbuzz',
+    ],
 
-        treats: [
-            {
-                name: "chocolate",
-            }
-        ],
-    }
+    treats: [
+      {
+        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, '  '),
+}