relocate substitute_variables_with_mapping to parse_data

tests/test_parser.py

@@ -185,6 +185,33 @@ class TestParser(unittest.TestCase):
             3 * 2 * 3
         )
 
+    def test_parse_data(self):
+        content = {
+            'request': {
+                'url': '/api/users/$uid',
+                'method': "$method",
+                'headers': {'token': '$token'},
+                'data': {
+                    "null": None,
+                    "true": True,
+                    "false": False,
+                    "empty_str": ""
+                }
+            }
+        }
+        mapping = {
+            "$uid": 1000,
+            "$method": "POST"
+        }
+        result = parser.parse_data(content, mapping)
+        self.assertEqual("/api/users/1000", result["request"]["url"])
+        self.assertEqual("$token", result["request"]["headers"]["token"])
+        self.assertEqual("POST", result["request"]["method"])
+        self.assertIsNone(result["request"]["data"]["null"])
+        self.assertTrue(result["request"]["data"]["true"])
+        self.assertFalse(result["request"]["data"]["false"])
+        self.assertEqual("", result["request"]["data"]["empty_str"])
+
 
 class TestTestcaseParser(unittest.TestCase):