make extract in testcase template compatible with mapping style:

new mapping style:
    extract: {
        a: content.a,
        b: text.b
    }

    Also, the former list style is still valid:
    extract: [
        {a: content.a},
        {b: text.b}
    ]

httprunner/loader.py

@@ -296,7 +296,7 @@ def load_test(raw_testinfo):
                 "api": "api_add_cart",
                 "variables": [],
                 "validate": [],
-                "extract": []
+                "extract": {}
             }
             # testcase reference
             {
@@ -310,7 +310,7 @@ def load_test(raw_testinfo):
                 "request": {},
                 "variables": [],
                 "validate": [],
-                "extract": []
+                "extract": {}
             }
 
     Returns:

httprunner/parser.py

@@ -566,14 +566,14 @@ def _extend_with_api(test_dict, api_def_dict):
             }
         >>> test_dict = {
                 "name": "get token 2",
-                "extract": [{"token": "content.token"}],
+                "extract": {"token": "content.token"},
                 "validate": [{'eq': ['status_code', 201]}, {'len_eq': ['content.token', 16]}]
             }
         >>> _extend_with_api(test_dict, api_def_dict)
             {
                 "name": "get token 2",
                 "request": {...},
-                "extract": [{"token": "content.token"}],
+                "extract": {"token": "content.token"},
                 "validate": [{'eq': ['status_code', 201]}, {'len_eq': ['content.token', 16]}]
             }
 
@@ -606,10 +606,10 @@ def _extend_with_api(test_dict, api_def_dict):
     )
 
     # merge & override extractors
-    def_extrators = api_def_dict.pop("extract", [])
+    def_extrators = api_def_dict.pop("extract", {})
     test_dict["extract"] = utils.extend_variables(
         def_extrators,
-        test_dict.get("extract", [])
+        test_dict.get("extract", {})
     )
 
     # TODO: merge & override request

httprunner/runner.py

@@ -169,7 +169,7 @@ class Runner(object):
                         },
                         "json": {"name": "user", "password": "123456"}
                     },
-                    "extract": [],              # optional
+                    "extract": {},              # optional
                     "validate": [],             # optional
                     "setup_hooks": [],          # optional
                     "teardown_hooks": []        # optional
@@ -238,7 +238,7 @@ class Runner(object):
             self.do_hook_actions(teardown_hooks, "teardown")
 
         # extract
-        extractors = test_dict.get("extract", [])
+        extractors = test_dict.get("extract", {})
         extracted_variables_mapping = resp_obj.extract_response(extractors)
         self.session_context.update_seesion_variables(extracted_variables_mapping)
 

tests/data/demo_testcase_hardcode.json

@@ -20,11 +20,9 @@
                 {"expect_status_code": 200},
                 {"token_len": 16}
             ],
-            "extract": [
-                {
-                    "token": "content.token"
-                }
-            ],
+            "extract": {
+                "token": "content.token"
+            },
             "validate": [
                 {"check": "status_code", "comparator": "eq", "expect": 200},
                 {"eq": ["status_code", "$expect_status_code"]},

tests/data/demo_testcase_hardcode.yml

@@ -15,7 +15,7 @@
         expect_status_code: 200
         token_len: 16
     extract:
-        - token: content.token
+        token: content.token
     validate:
         - {"check": "status_code", "comparator": "eq", "expect": 200}
         - eq: ["status_code", $expect_status_code]
@@ -38,7 +38,7 @@
             name: "user1"
             password: "123456"
     extract:
-        - success: content.success
+        success: content.success
     validate:
         - eq: ["status_code", 201]
         - sum_status_code: ["status_code", 3]