1. add test case

test/bad_fmt/test.tf

@@ -0,0 +1,31 @@
+variable "test_var" {
+  default = ""
+}
+
+provider "archive" {}
+
+variable "test_list_var" {
+  type    = "list"
+  default = ["a", "b"]
+}
+
+variable "test_map_var" {
+  type = "map"
+
+  default = {
+      "a" = "a"
+    "b" = "b"
+  }
+}
+
+output "test_output" {
+  value = "${var.test_var}"
+}
+
+output "test_list_output" {
+  value = "${var.test_list_var}"
+}
+
+output "test_map_output" {
+  value = "${var.test_map_var}"
+}