Issue #112 was fixed in the formatter merge, adding tests here to avoid regression

Author: sparkprime

test_suite/error.parse.array_comma.jsonnet

@@ -0,0 +1,17 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+[1, 2 3]

test_suite/error.parse.array_comma.jsonnet.golden

@@ -0,0 +1 @@
+STATIC ERROR: error.parse.array_comma.jsonnet:17:7: Expected a comma before next array element.