add test for bad formatting

tests/test_rules.py

@@ -9,7 +9,8 @@ def test_rule_validity():
     for path in RULE_PATHS:
         try:
             with open(path, "r") as f:
-                data = json.loads(f.read())
+                raw_text = f.read()
+                data = json.loads(raw_text)
         except Exception as e:
             raise ValueError(f"Something went wrong when reading '{path}': {str(e)}.")
 
@@ -32,3 +33,7 @@ def test_rule_validity():
 
             if "args" in rule:
                 assert isinstance(rule["args"], (list, tuple))
+
+        assert (
+            json.dumps(data, indent=2, sort_keys=True) == raw_text.rstrip()
+        ), f"Check {path} for formatting issue"