Unit test to verify that parsing fails on a certain kind of malformed JSON

template/parse_test.go

@@ -359,6 +359,7 @@ func TestParse_bad(t *testing.T) {
 		{"error-beginning.json", "line 1, column 1 (offset 1)"},
 		{"error-middle.json", "line 5, column 6 (offset 50)"},
 		{"error-end.json", "line 1, column 30 (offset 30)"},
+		{"malformed.json", "line 16, column 3 (offset 433)"},
 	}
 	for _, tc := range cases {
 		_, err := ParseFile(fixtureDir(tc.File))

template/test-fixtures/malformed.json

@@ -0,0 +1,25 @@
+{
+  "variables": {
+    "access_key": "{{env `AWS_ACCESS_KEY_ID`}}",
+    "secret_key": "{{env `AWS_SECRET_ACCESS_KEY`}}"
+  },
+  "builders": [{
+    "type": "amazon-ebs",
+    "access_key": "{{user `access_key`}}",
+    "secret_key": "{{user `secret_key`}}",
+    "region": "us-east-1",
+    "source_ami": "ami-fce3c696,",
+    "instance_type": "t2.micro",
+    "ssh_username": "ubuntu",
+    "ami_name": "packer-example {{timestamp}}"
+  }]
+}]
+
+  "provisioners": [{
+    "type": "shell",
+    "inline": [
+      "sleep 15",
+      "sudo yum update -y"
+    ]
+  }]
+}