Add JSON test case for variable sensitive flag

configs/testdata/valid-files/variables.tf.json

@@ -16,6 +16,13 @@
     },
     "π": {
       "default": 3.14159265359
+    },
+    "sensitive_value": {
+      "default": {
+        "a": 1,
+        "b": 2
+      },
+      "sensitive": true
     }
   }
 }