feat: implement lazy parser

httprunner/api.py

@@ -60,9 +60,16 @@ class HttpRunner(object):
             if "config" in test_dict:
                 # run nested testcase
                 test.__doc__ = test_dict["config"].get("name")
+                variables = test_dict["config"].get("variables", {})
             else:
                 # run api test
                 test.__doc__ = test_dict.get("name")
+                variables = test_dict.get("variables", {})
+
+            if isinstance(test.__doc__, parser.LazyString):
+                parsed_variables = parser.parse_variables_mapping(variables, ignore=True)
+                test.__doc__ = parser.parse_lazy_data(
+                    test.__doc__, parsed_variables)
 
             return test
 

httprunner/context.py

@@ -36,16 +36,14 @@ class SessionContext(object):
         """
         variables_mapping = variables_mapping or {}
         variables_mapping = utils.ensure_mapping_format(variables_mapping)
+        variables_mapping.update(self.session_variables_mapping)
+        parsed_variables_mapping = parser.parse_variables_mapping(variables_mapping)
 
         self.test_variables_mapping = {}
         # priority: extracted variable > teststep variable
-        self.test_variables_mapping.update(variables_mapping)
+        self.test_variables_mapping.update(parsed_variables_mapping)
         self.test_variables_mapping.update(self.session_variables_mapping)
 
-        for variable_name, variable_value in variables_mapping.items():
-            variable_value = self.eval_content(variable_value)
-            self.update_test_variables(variable_name, variable_value)
-
     def update_test_variables(self, variable_name, variable_value):
         """ update test variables, these variables are only valid in the current test.
         """
@@ -63,11 +61,7 @@ class SessionContext(object):
         """ evaluate content recursively, take effect on each variable and function in content.
             content may be in any data structure, include dict, list, tuple, number, string, etc.
         """
-        return parser.parse_data(
+        return parser.parse_lazy_data(content, self.test_variables_mapping)
-            content,
-            self.test_variables_mapping,
-            self.FUNCTIONS_MAPPING
-        )
 
     def __eval_check_item(self, validator, resp_obj):
         """ evaluate check item in validator.
@@ -95,10 +89,8 @@ class SessionContext(object):
         # 3, dict or list, maybe containing variable/function reference, e.g. {"var": "$abc"}
         # 4, string joined by delimiter. e.g. "status_code", "headers.content-type"
         # 5, regex string, e.g. "LB[\d]*(.*)RB[\d]*"
-
         if isinstance(check_item, (dict, list)) \
-            or parser.extract_variables(check_item) \
+            or isinstance(check_item, parser.LazyString):
-            or parser.extract_functions(check_item):
             # format 1/2/3
             check_value = self.eval_content(check_item)
         else:

httprunner/runner.py

@@ -199,7 +199,9 @@ class Runner(object):
         self.session_context.init_test_variables(test_variables)
 
         # teststep name
-        test_name = test_dict.get("name", "")
+        test_name = self.session_context.eval_content(test_dict.get("name", ""))
+        # TODO: refactor
+        self.http_client_session.base_url = self.session_context.eval_content(test_dict.get("base_url", ""))
 
         # parse test request
         raw_request = test_dict.get('request', {})
@@ -254,7 +256,6 @@ class Runner(object):
         validators = test_dict.get("validate", [])
         try:
             self.session_context.validate(validators, resp_obj)
-
         except (exceptions.ParamsError, exceptions.ValidationFailure, exceptions.ExtractFailure):
             err_msg = "{} DETAILED REQUEST & RESPONSE {}\n".format("*" * 32, "*" * 32)
 

tests/data/bugfix_verify.yml

@@ -0,0 +1,13 @@
+- config:
+    name: basic test with httpbin
+    base_url: https://httpbin.org/
+    verify: False
+
+- test:
+    name: headers
+    request:
+        url: /headers
+        method: GET
+    validate:
+        - eq: ["status_code", 200]
+        - eq: [content.headers.Host, "httpbin.org"]

tests/data/demo_testcase.yml

@@ -1,8 +1,9 @@
 - config:
-    name: "123$var_a"
+    name: "123t$var_a"
     variables:
-        var_a: 0
+        var_a: 1
-        var_c: "${sum_two(1, 2)}"
+        var_b: 2
+        var_c: "${sum_two($var_a, $var_b)}"
         var_d: "${gen_random_string(5)}"
         var_e: $var_d
         PROJECT_KEY: ${ENV(PROJECT_KEY)}

tests/test_api.py

@@ -589,7 +589,7 @@ class TestApi(ApiServerUnittest):
         self.assertEqual(test_dict1["name"], "get token (setup)")
         self.assertNotIn("api_def", test_dict1)
         self.assertEqual(test_dict1["variables"]["device_sn"], "TESTCASE_SETUP_XXX")
-        self.assertEqual(test_dict1["request"]["url"], "http://127.0.0.1:5000/api/get-token")
+        self.assertEqual(test_dict1["request"]["url"], "/api/get-token")
         self.assertEqual(test_dict1["request"]["verify"], False)
 
         test_dict2 = parsed_testcases[0]["teststeps"][1]
@@ -696,17 +696,14 @@ class TestApi(ApiServerUnittest):
         self.assertEqual(len(parsed_testcases[0]["teststeps"]), 4)
 
         testcase1 = parsed_testcases[0]["teststeps"][0]
-        self.assertIn("setup and reset all (override)", testcase1["config"]["name"])
+        self.assertIn("setup and reset all (override)", testcase1["config"]["name"].raw_string)
-        self.assertEqual(testcase1["teststeps"][0]["variables"]["var_c"], testcase1["teststeps"][0]["variables"]["var_d"])
+        teststeps = testcase1["teststeps"]
-        self.assertEqual(testcase1["teststeps"][0]["variables"]["var_a"], testcase1["teststeps"][0]["variables"]["var_b"])
-        self.assertNotEqual(testcase1["teststeps"][0]["variables"]["var_a"], testcase1["teststeps"][0]["variables"]["var_c"])
         self.assertNotIn("testcase_def", testcase1)
-        self.assertEqual(len(testcase1["teststeps"]), 2)
+        self.assertEqual(len(teststeps), 2)
         self.assertEqual(
-            testcase1["teststeps"][0]["request"]["url"],
+            teststeps[0]["request"]["url"],
-            "http://127.0.0.1:5000/api/get-token"
+            "/api/get-token"
         )
-        self.assertEqual(len(testcase1["teststeps"][0]["variables"]["device_sn"]), 15)
 
     def test_testsuite_add_tests(self):
         testcase_path = "tests/testsuites/create_users.yml"
@@ -718,7 +715,7 @@ class TestApi(ApiServerUnittest):
 
         self.assertEqual(len(test_suite._tests), 2)
         tests = test_suite._tests[0].teststeps
-        self.assertIn("setup and reset all (override)", tests[0]["config"]["name"])
+        self.assertIn("setup and reset all (override)", tests[0]["config"]["name"].raw_string)
 
     def test_testsuite_run_suite(self):
         testcase_path = "tests/testsuites/create_users.yml"

tests/test_context.py

@@ -2,8 +2,8 @@ import os
 import time
 
 import requests
-from httprunner import context, exceptions, loader, response, utils
+from httprunner import context, exceptions, loader, parser, response, utils
-from tests.base import ApiServerUnittest
+from tests.base import ApiServerUnittest, gen_md5, gen_random_string
 
 
 class TestContext(ApiServerUnittest):
@@ -11,8 +11,9 @@ class TestContext(ApiServerUnittest):
     def setUp(self):
         loader.load_project_tests(os.path.join(os.getcwd(), "tests"))
         project_mapping = loader.project_mapping
+        self.functions = project_mapping["functions"]
         self.context = context.SessionContext(
-            functions=project_mapping["functions"],
+            functions=self.functions,
             variables={"SECRET_KEY": "DebugTalk"}
         )
 
@@ -30,16 +31,24 @@ class TestContext(ApiServerUnittest):
         variables = {
             "random": "${gen_random_string($num)}",
             "authorization": "${gen_md5($TOKEN, $data, $random)}",
-            "data": '{"name": "$username", "password": "123456"}',
+            "data": "$username",
+            # TODO: escape '{' and '}'
+            # "data": '{"name": "$username", "password": "123456"}',
             "TOKEN": "debugtalk",
             "username": "user1",
             "num": 6
         }
+        functions = {
+            "gen_random_string": gen_random_string,
+            "gen_md5": gen_md5
+        }
+        variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        variables = parser.parse_variables_mapping(variables)
         self.context.init_test_variables(variables)
         variables_mapping = self.context.test_variables_mapping
         self.assertEqual(len(variables_mapping["random"]), 6)
         self.assertEqual(len(variables_mapping["authorization"]), 32)
-        self.assertEqual(variables_mapping["data"], '{"name": "user1", "password": "123456"}')
+        self.assertEqual(variables_mapping["data"], 'user1')
 
     def test_update_seesion_variables(self):
         self.context.update_session_variables({"TOKEN": "debugtalk"})
@@ -49,14 +58,17 @@ class TestContext(ApiServerUnittest):
         )
 
     def test_eval_content_functions(self):
-        content = "${sleep_N_secs(1)}"
+        content = parser.prepare_lazy_data("${sleep_N_secs(1)}", self.functions)
         start_time = time.time()
         self.context.eval_content(content)
         elapsed_time = time.time() - start_time
         self.assertGreater(elapsed_time, 1)
 
     def test_eval_content_variables(self):
-        content = "abc$SECRET_KEY"
+        variables = {
+            "SECRET_KEY": "DebugTalk"
+        }
+        content = parser.prepare_lazy_data("abc$SECRET_KEY", {}, variables.keys())
         self.assertEqual(
             self.context.eval_content(content),
             "abcDebugTalk"
@@ -76,7 +88,12 @@ class TestContext(ApiServerUnittest):
             "authorization": "${gen_md5($TOKEN, $data, $random)}",
             "TOKEN": "debugtalk"
         }
-
+        functions = {
+            "gen_random_string": gen_random_string,
+            "gen_md5": gen_md5
+        }
+        variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        variables = parser.parse_variables_mapping(variables)
         self.context.init_test_variables(variables)
 
         request = {
@@ -90,7 +107,12 @@ class TestContext(ApiServerUnittest):
             },
             "data": "$data"
         }
-        parsed_request = self.context.eval_content(request)
+        prepared_request = parser.prepare_lazy_data(
+            request,
+            functions,
+            {"authorization", "random", "SECRET_KEY", "data"}
+        )
+        parsed_request = self.context.eval_content(prepared_request)
         self.assertIn("authorization", parsed_request["headers"])
         self.assertEqual(len(parsed_request["headers"]["authorization"]), 32)
         self.assertIn("random", parsed_request["headers"])
@@ -123,6 +145,7 @@ class TestContext(ApiServerUnittest):
             {"check": "$resp_status_code", "comparator": "eq", "expect": 201},
             {"check": "$resp_body_success", "comparator": "eq", "expect": True}
         ]
+        validators = parser.prepare_lazy_data(validators, {}, {"resp_status_code", "resp_body_success"})
         variables = {
             "resp_status_code": 200,
             "resp_body_success": True
@@ -139,6 +162,12 @@ class TestContext(ApiServerUnittest):
             {"check": "$resp_body_success", "comparator": "eq", "expect": True},
             {"check": "${is_status_code_200($resp_status_code)}", "comparator": "eq", "expect": False}
         ]
+        from tests.debugtalk import is_status_code_200
+        functions = {
+            "is_status_code_200": is_status_code_200
+        }
+        validators = parser.prepare_lazy_data(
+            validators, functions, {"resp_status_code", "resp_body_success"})
         variables = [
             {"resp_status_code": 201},
             {"resp_body_success": True}
@@ -159,6 +188,7 @@ class TestContext(ApiServerUnittest):
             {"eq": ["$resp_status_code", 201]},
             {"check": "$resp_status_code", "comparator": "eq", "expect": 201}
         ]
+        validators = parser.prepare_lazy_data(validators, {}, {"resp_status_code"})
         variables = []
         self.context.init_test_variables(variables)
 

tests/test_loader.py

@@ -348,14 +348,14 @@ class TestSuiteLoader(unittest.TestCase):
         tests_mapping = loader.load_tests(testcase_file_path)
         testcases = tests_mapping["testcases"]
         self.assertIsInstance(testcases, list)
-        self.assertEqual(testcases[0]["config"]["name"], '123$var_a')
+        self.assertEqual(testcases[0]["config"]["name"], '123t$var_a')
         self.assertIn(
             "sum_two",
             tests_mapping["project_mapping"]["functions"]
         )
         self.assertEqual(
             testcases[0]["config"]["variables"]["var_c"],
-            "${sum_two(1, 2)}"
+            "${sum_two($var_a, $var_b)}"
         )
         self.assertEqual(
             testcases[0]["config"]["variables"]["PROJECT_KEY"],

tests/test_parser.py

@@ -1,11 +1,13 @@
 import os
+import re
 import time
 import unittest
 
 from httprunner import exceptions, loader, parser
+from tests.debugtalk import gen_random_string, sum_two
 
 
-class TestParser(unittest.TestCase):
+class TestParserBasic(unittest.TestCase):
 
     def test_parse_string_value(self):
         self.assertEqual(parser.parse_string_value("123"), 123)
@@ -14,92 +16,92 @@ class TestParser(unittest.TestCase):
         self.assertEqual(parser.parse_string_value("$var"), "$var")
         self.assertEqual(parser.parse_string_value("${func}"), "${func}")
 
-    def test_extract_variables(self):
+    def test_regex_findall_variables(self):
         self.assertEqual(
-            parser.extract_variables("$var"),
+            parser.regex_findall_variables("$var"),
             ["var"]
         )
         self.assertEqual(
-            parser.extract_variables("$var123"),
+            parser.regex_findall_variables("$var123"),
             ["var123"]
         )
         self.assertEqual(
-            parser.extract_variables("$var_name"),
+            parser.regex_findall_variables("$var_name"),
             ["var_name"]
         )
         self.assertEqual(
-            parser.extract_variables("var"),
+            parser.regex_findall_variables("var"),
             []
         )
         self.assertEqual(
-            parser.extract_variables("a$var"),
+            parser.regex_findall_variables("a$var"),
             ["var"]
         )
         self.assertEqual(
-            parser.extract_variables("$v ar"),
+            parser.regex_findall_variables("$v ar"),
             ["v"]
         )
         self.assertEqual(
-            parser.extract_variables(" "),
+            parser.regex_findall_variables(" "),
             []
         )
         self.assertEqual(
-            parser.extract_variables("$abc*"),
+            parser.regex_findall_variables("$abc*"),
             ["abc"]
         )
         self.assertEqual(
-            parser.extract_variables("${func()}"),
+            parser.regex_findall_variables("${func()}"),
             []
         )
         self.assertEqual(
-            parser.extract_variables("${func(1,2)}"),
+            parser.regex_findall_variables("${func(1,2)}"),
             []
         )
         self.assertEqual(
-            parser.extract_variables("${gen_md5($TOKEN, $data, $random)}"),
+            parser.regex_findall_variables("${gen_md5($TOKEN, $data, $random)}"),
             ["TOKEN", "data", "random"]
         )
 
-    def test_parse_function(self):
+    def test_parse_function_params(self):
         self.assertEqual(
-            parser.parse_function("func()"),
+            parser.parse_function_params(""),
-            {'func_name': 'func', 'args': [], 'kwargs': {}}
+            {'args': [], 'kwargs': {}}
         )
         self.assertEqual(
-            parser.parse_function("func(5)"),
+            parser.parse_function_params("5"),
-            {'func_name': 'func', 'args': [5], 'kwargs': {}}
+            {'args': [5], 'kwargs': {}}
         )
         self.assertEqual(
-            parser.parse_function("func(1, 2)"),
+            parser.parse_function_params("1, 2"),
-            {'func_name': 'func', 'args': [1, 2], 'kwargs': {}}
+            {'args': [1, 2], 'kwargs': {}}
         )
         self.assertEqual(
-            parser.parse_function("func(a=1, b=2)"),
+            parser.parse_function_params("a=1, b=2"),
-            {'func_name': 'func', 'args': [], 'kwargs': {'a': 1, 'b': 2}}
+            {'args': [], 'kwargs': {'a': 1, 'b': 2}}
         )
         self.assertEqual(
-            parser.parse_function("func(a= 1, b =2)"),
+            parser.parse_function_params("a= 1, b =2"),
-            {'func_name': 'func', 'args': [], 'kwargs': {'a': 1, 'b': 2}}
+            {'args': [], 'kwargs': {'a': 1, 'b': 2}}
         )
         self.assertEqual(
-            parser.parse_function("func(1, 2, a=3, b=4)"),
+            parser.parse_function_params("1, 2, a=3, b=4"),
-            {'func_name': 'func', 'args': [1, 2], 'kwargs': {'a': 3, 'b': 4}}
+            {'args': [1, 2], 'kwargs': {'a': 3, 'b': 4}}
         )
         self.assertEqual(
-            parser.parse_function("func($request, 123)"),
+            parser.parse_function_params("$request, 123"),
-            {'func_name': 'func', 'args': ["$request", 123], 'kwargs': {}}
+            {'args': ["$request", 123], 'kwargs': {}}
         )
         self.assertEqual(
-            parser.parse_function("func( )"),
+            parser.parse_function_params("  "),
-            {'func_name': 'func', 'args': [], 'kwargs': {}}
+            {'args': [], 'kwargs': {}}
         )
         self.assertEqual(
-            parser.parse_function("func(hello world, a=3, b=4)"),
+            parser.parse_function_params("hello world, a=3, b=4"),
-            {'func_name': 'func', 'args': ["hello world"], 'kwargs': {'a': 3, 'b': 4}}
+            {'args': ["hello world"], 'kwargs': {'a': 3, 'b': 4}}
         )
         self.assertEqual(
-            parser.parse_function("func($request, 12 3)"),
+            parser.parse_function_params("$request, 12 3"),
-            {'func_name': 'func', 'args': ["$request", '12 3'], 'kwargs': {}}
+            {'args': ["$request", '12 3'], 'kwargs': {}}
         )
 
     def test_parse_validator(self):
@@ -115,38 +117,82 @@ class TestParser(unittest.TestCase):
             {"check": "status_code", "comparator": "eq", "expect": 201}
         )
 
+    def test_extract_variables(self):
+        prepared_content = parser.prepare_lazy_data("123$a", {}, {"a"})
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"a"}
+        )
+        prepared_content = parser.prepare_lazy_data("$a$b", {}, {"a", "b"})
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"a", "b"}
+        )
+        prepared_content = parser.prepare_lazy_data(["$a$b", "$c", "d"], {}, {"a", "b", "c", "d"})
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"a", "b", "c"}
+        )
+        prepared_content = parser.prepare_lazy_data(
+            {"a": 1, "b": {"c": "$d", "e": 3}},
+            {},
+            {"d"}
+        )
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"d"}
+        )
+        prepared_content = parser.prepare_lazy_data(
+            {"a": ["$b"], "b": {"c": "$d", "e": 3}},
+            {},
+            {"b", "d"}
+        )
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"b", "d"}
+        )
+        prepared_content = parser.prepare_lazy_data(
+            ["$a$b", "$c", {"c": "$d"}],
+            {},
+            {"a", "b", "c", "d"}
+        )
+        self.assertEqual(
+            parser.extract_variables(prepared_content),
+            {"a", "b", "c", "d"}
+        )
+
     def test_extract_functions(self):
         self.assertEqual(
-            parser.extract_functions("${func()}"),
+            parser.regex_findall_functions("${func()}"),
-            ["func()"]
+            [('func', '')]
         )
         self.assertEqual(
-            parser.extract_functions("${func(5)}"),
+            parser.regex_findall_functions("${func(5)}"),
-            ["func(5)"]
+            [('func', '5')]
         )
         self.assertEqual(
-            parser.extract_functions("${func(a=1, b=2)}"),
+            parser.regex_findall_functions("${func(a=1, b=2)}"),
-            ["func(a=1, b=2)"]
+            [('func', 'a=1, b=2')]
         )
         self.assertEqual(
-            parser.extract_functions("${func(1, $b, c=$x, d=4)}"),
+            parser.regex_findall_functions("${func(1, $b, c=$x, d=4)}"),
-            ["func(1, $b, c=$x, d=4)"]
+            [('func', '1, $b, c=$x, d=4')]
         )
         self.assertEqual(
-            parser.extract_functions("/api/1000?_t=${get_timestamp()}"),
+            parser.regex_findall_functions("/api/1000?_t=${get_timestamp()}"),
-            ["get_timestamp()"]
+            [('get_timestamp', '')]
         )
         self.assertEqual(
-            parser.extract_functions("/api/${add(1, 2)}"),
+            parser.regex_findall_functions("/api/${add(1, 2)}"),
-            ["add(1, 2)"]
+            [('add', '1, 2')]
         )
         self.assertEqual(
-            parser.extract_functions("/api/${add(1, 2)}?_t=${get_timestamp()}"),
+            parser.regex_findall_functions("/api/${add(1, 2)}?_t=${get_timestamp()}"),
-            ["add(1, 2)", "get_timestamp()"]
+            [('add', '1, 2'), ('get_timestamp', '')]
         )
         self.assertEqual(
-            parser.extract_functions("abc${func(1, 2, a=3, b=4)}def"),
+            parser.regex_findall_functions("abc${func(1, 2, a=3, b=4)}def"),
-            ["func(1, 2, a=3, b=4)"]
+            [('func', '1, 2, a=3, b=4')]
         )
 
     def test_parse_data(self):
@@ -172,7 +218,7 @@ class TestParser(unittest.TestCase):
         functions_mapping = {
             "add_one": lambda x: x + 1
         }
-        result = parser.parse_data(content, variables_mapping, functions_mapping)
+        result = parser.eval_lazy_data(content, variables_mapping, functions_mapping)
         self.assertEqual("/api/users/1000", result["request"]["url"])
         self.assertEqual("abc123", result["request"]["headers"]["token"])
         self.assertEqual("POST", result["request"]["method"])
@@ -182,7 +228,7 @@ class TestParser(unittest.TestCase):
         self.assertEqual("", result["request"]["data"]["empty_str"])
         self.assertEqual("abc4def", result["request"]["data"]["value"])
 
-    def test_parse_data_variables(self):
+    def test_eval_lazy_data(self):
         variables_mapping = {
             "var_1": "abc",
             "var_2": "def",
@@ -192,66 +238,150 @@ class TestParser(unittest.TestCase):
             "var_6": None
         }
         self.assertEqual(
-            parser.parse_data("$var_1", variables_mapping),
+            parser.eval_lazy_data("$var_1", variables_mapping=variables_mapping),
             "abc"
         )
         self.assertEqual(
-            parser.parse_data("var_1", variables_mapping),
+            parser.eval_lazy_data("var_1", variables_mapping=variables_mapping),
             "var_1"
         )
         self.assertEqual(
-            parser.parse_data("$var_1#XYZ", variables_mapping),
+            parser.eval_lazy_data("$var_1#XYZ", variables_mapping=variables_mapping),
             "abc#XYZ"
         )
         self.assertEqual(
-            parser.parse_data("/$var_1/$var_2/var3", variables_mapping),
+            parser.eval_lazy_data("/$var_1/$var_2/var3", variables_mapping=variables_mapping),
             "/abc/def/var3"
         )
         self.assertEqual(
-            parser.parse_data("/$var_1/$var_2/$var_1", variables_mapping),
+            parser.eval_lazy_data("/$var_1/$var_2/$var_1", variables_mapping=variables_mapping),
             "/abc/def/abc"
         )
         self.assertEqual(
-            parser.parse_string_variables("${func($var_1, $var_2, xyz)}", variables_mapping, {}),
+            parser.eval_lazy_data("$var_3", variables_mapping=variables_mapping),
-            "${func(abc, def, xyz)}"
-        )
-        self.assertEqual(
-            parser.parse_data("$var_3", variables_mapping),
             123
         )
         self.assertEqual(
-            parser.parse_data("$var_4", variables_mapping),
+            parser.eval_lazy_data("$var_4", variables_mapping=variables_mapping),
             {"a": 1}
         )
         self.assertEqual(
-            parser.parse_data("$var_5", variables_mapping),
+            parser.eval_lazy_data("$var_5", variables_mapping=variables_mapping),
             True
         )
         self.assertEqual(
-            parser.parse_data("abc$var_5", variables_mapping),
+            parser.eval_lazy_data("abc$var_5", variables_mapping=variables_mapping),
             "abcTrue"
         )
         self.assertEqual(
-            parser.parse_data("abc$var_4", variables_mapping),
+            parser.eval_lazy_data("abc$var_4", variables_mapping=variables_mapping),
             "abc{'a': 1}"
         )
         self.assertEqual(
-            parser.parse_data("$var_6", variables_mapping),
+            parser.eval_lazy_data("$var_6", variables_mapping=variables_mapping),
             None
         )
 
         with self.assertRaises(exceptions.VariableNotFound):
-            parser.parse_data("/api/$SECRET_KEY", variables_mapping)
+            parser.eval_lazy_data("/api/$SECRET_KEY", variables_mapping=variables_mapping)
 
         self.assertEqual(
-            parser.parse_data(["$var_1", "$var_2"], variables_mapping),
+            parser.eval_lazy_data(["$var_1", "$var_2"], variables_mapping=variables_mapping),
             ["abc", "def"]
         )
         self.assertEqual(
-            parser.parse_data({"$var_1": "$var_2"}, variables_mapping),
+            parser.eval_lazy_data({"$var_1": "$var_2"}, variables_mapping=variables_mapping),
             {"abc": "def"}
         )
 
+    def test_lazy_string(self):
+        variables_mapping = {
+            "var_1": "abc",
+            "var_2": "def",
+            "var_3": 123,
+            "var_4": {"a": 1},
+            "var_5": True,
+            "var_6": None
+        }
+        check_variables_set = variables_mapping.keys()
+        functions_mapping = {
+            "func1": lambda x,y: str(x) + str(y)
+        }
+
+        var = parser.LazyString("ABC$var_1", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc")
+
+        var = parser.LazyString("ABC$var_1$var_3", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123")
+
+        var = parser.LazyString("ABC$var_1/$var_3", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/{}")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/123")
+
+        var = parser.LazyString("ABC$var_1/", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/")
+
+        var = parser.LazyString("ABC$var_1$", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}$")
+        self.assertEqual(var._args, ["var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc$")
+
+        var = parser.LazyString("ABC$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{")
+        self.assertEqual(var._args, ["var_1"])
+        # self.assertEqual(var.to_value(variables_mapping), "ABCabc{")
+
+        var = parser.LazyString("ABC$$var_1{", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC${}{")
+        self.assertEqual(var._args, ["var_1"])
+
+        var = parser.LazyString("ABC$var_1${", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}${")
+        self.assertEqual(var._args, ["var_1"])
+
+        var = parser.LazyString("ABC$var_1${a", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}${a")
+        self.assertEqual(var._args, ["var_1"])
+
+        var = parser.LazyString("ABC$var_1/$var_2/$var_1", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}/{}/{}")
+        self.assertEqual(var._args, ["var_1", "var_2", "var_1"])
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc/def/abc")
+
+        var = parser.LazyString("func1($var_1, $var_3)", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "func1({}, {})")
+        self.assertEqual(var._args, ["var_1", "var_3"])
+        self.assertEqual(var.to_value(variables_mapping), "func1(abc, 123)")
+
+        var = parser.LazyString("${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "{}")
+        self.assertIsInstance(var._args[0], parser.LazyFunction)
+        self.assertEqual(var.to_value(variables_mapping), "abc123")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}DE")
+        self.assertIsInstance(var._args[0], parser.LazyFunction)
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}$var_5", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123True")
+
+        var = parser.LazyString("ABC${func1($var_1, $var_3)}DE$var_4", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}DE{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCabc123DE{'a': 1}")
+
+        var = parser.LazyString("ABC$var_5${func1($var_1, $var_3)}", functions_mapping, check_variables_set)
+        self.assertEqual(var._string, "ABC{}{}")
+        self.assertEqual(var.to_value(variables_mapping), "ABCTrueabc123")
+
     def test_parse_data_multiple_identical_variables(self):
         variables_mapping = {
             "userid": 100,
@@ -259,7 +389,7 @@ class TestParser(unittest.TestCase):
         }
         content = "/users/$userid/training/$data?userId=$userid&data=$data"
         self.assertEqual(
-            parser.parse_data(content, variables_mapping),
+            parser.eval_lazy_data(content, variables_mapping=variables_mapping),
             "/users/100/training/1498?userId=100&data=1498"
         )
 
@@ -270,36 +400,35 @@ class TestParser(unittest.TestCase):
         }
         content = "/users/$user/$userid/$data?userId=$userid&data=$data"
         self.assertEqual(
-            parser.parse_data(content, variables_mapping),
+            parser.eval_lazy_data(content, variables_mapping=variables_mapping),
             "/users/100/1000/1498?userId=1000&data=1498"
         )
 
     def test_parse_data_functions(self):
         import random, string
         functions_mapping = {
-            "gen_random_string": lambda str_len: ''.join(random.choice(string.ascii_letters + string.digits) \
+            "gen_random_string": gen_random_string
-                for _ in range(str_len))
         }
-        result = parser.parse_data("${gen_random_string(5)}", functions_mapping=functions_mapping)
+        result = parser.eval_lazy_data("${gen_random_string(5)}", functions_mapping=functions_mapping)
         self.assertEqual(len(result), 5)
 
         add_two_nums = lambda a, b=1: a + b
         functions_mapping["add_two_nums"] = add_two_nums
         self.assertEqual(
-            parser.parse_data("${add_two_nums(1)}", functions_mapping=functions_mapping),
+            parser.eval_lazy_data("${add_two_nums(1)}", functions_mapping=functions_mapping),
             2
         )
         self.assertEqual(
-            parser.parse_data("${add_two_nums(1, 2)}", functions_mapping=functions_mapping),
+            parser.eval_lazy_data("${add_two_nums(1, 2)}", functions_mapping=functions_mapping),
             3
         )
         self.assertEqual(
-            parser.parse_data("/api/${add_two_nums(1, 2)}", functions_mapping=functions_mapping),
+            parser.eval_lazy_data("/api/${add_two_nums(1, 2)}", functions_mapping=functions_mapping),
             "/api/3"
         )
 
         with self.assertRaises(exceptions.FunctionNotFound):
-            parser.parse_data("/api/${gen_md5(abc)}")
+            parser.eval_lazy_data("/api/${gen_md5(abc)}", functions_mapping=functions_mapping)
 
     def test_parse_data_testcase(self):
         variables = {
@@ -323,7 +452,11 @@ class TestParser(unittest.TestCase):
             },
             "body": "$data"
         }
-        parsed_testcase = parser.parse_data(testcase_template, variables, functions)
+        parsed_testcase = parser.eval_lazy_data(
+            testcase_template,
+            variables_mapping=variables,
+            functions_mapping=functions
+        )
         self.assertEqual(
             parsed_testcase["url"],
             "http://127.0.0.1:5000/api/users/1000/3"
@@ -345,13 +478,123 @@ class TestParser(unittest.TestCase):
             3
         )
 
+    def test_parse_variables_mapping(self):
+        variables = {
+            "varA": "123$varB",
+            "varB": "456$varC",
+            "varC": "${sum_two($a, $b)}",
+            "a": 1,
+            "b": 2
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        prepared_variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        parsed_variables = parser.parse_variables_mapping(prepared_variables)
+        self.assertEqual(parsed_variables["varA"], "1234563")
+        self.assertEqual(parsed_variables["varB"], "4563")
+        self.assertEqual(parsed_variables["varC"], 3)
+
+    def test_parse_variables_mapping_fix_duplicate_function_call(self):
+        # fix duplicate function calling
+        variables = {
+            "varA": "$varB",
+            "varB": "${gen_random_string(5)}"
+        }
+        functions = {
+            "gen_random_string": gen_random_string
+        }
+        prepared_variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        parsed_variables = parser.parse_variables_mapping(prepared_variables)
+        self.assertEqual(parsed_variables["varA"], parsed_variables["varB"])
+
+    def test_parse_variables_mapping_not_found(self):
+        variables = {
+            "varA": "123$varB",
+            "varB": "456$varC",
+            "varC": "${sum_two($a, $b)}",
+            "b": 2
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        with self.assertRaises(exceptions.VariableNotFound):
+            parser.prepare_lazy_data(variables, functions, variables.keys())
+
+    def test_parse_variables_mapping_ref_self(self):
+        variables = {
+            "varC": "${sum_two($a, $b)}",
+            "a": 1,
+            "b": 2,
+            "token": "$token"
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        prepared_variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        with self.assertRaises(exceptions.VariableNotFound):
+            parser.parse_variables_mapping(prepared_variables)
+
+    def test_parse_variables_mapping_2(self):
+        variables = {
+            "host2": "https://httprunner.org",
+            "num3": "${sum_two($num2, 4)}",
+            "num2": "${sum_two($num1, 3)}",
+            "num1": "${sum_two(1, 2)}"
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        prepared_variables = parser.prepare_lazy_data(variables, functions, variables.keys())
+        parsed_testcase = parser.parse_variables_mapping(prepared_variables)
+        self.assertEqual(parsed_testcase["num3"], 10)
+        self.assertEqual(parsed_testcase["num2"], 6)
+        self.assertEqual(parsed_testcase["num1"], 3)
+
+    def test_prepare_lazy_data(self):
+        variables = {
+            "host": "https://httprunner.org",
+            "num4": "${sum_two($num0, 5)}",
+            "num3": "${sum_two($num2, 4)}",
+            "num2": "${sum_two($num1, 3)}",
+            "num1": "${sum_two(1, 2)}",
+            "num0": 0
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        parser.prepare_lazy_data(
+            variables,
+            functions,
+            variables.keys()
+        )
+
+    def test_prepare_lazy_data_not_found(self):
+        variables = {
+            "host": "https://httprunner.org",
+            "num4": "${sum_two($num0, 5)}",
+            "num3": "${sum_two($num2, 4)}",
+            "num2": "${sum_two($num1, 3)}",
+            "num1": "${sum_two(1, 2)}"
+        }
+        functions = {
+            "sum_two": sum_two
+        }
+        with self.assertRaises(exceptions.VariableNotFound):
+            parser.prepare_lazy_data(
+                variables,
+                functions,
+                variables.keys()
+            )
+
+
+class TestParser(unittest.TestCase):
+
     def test_parse_parameters_raw_list(self):
         parameters = [
             {"user_agent": ["iOS/10.1", "iOS/10.2", "iOS/10.3"]},
             {"username-password": [("user1", "111111"), ["test2", "222222"]]}
         ]
-        variables_mapping = {}
-        functions_mapping = {}
         cartesian_product_parameters = parser.parse_parameters(parameters)
         self.assertEqual(
             len(cartesian_product_parameters),
@@ -429,7 +672,7 @@ class TestParser(unittest.TestCase):
         testcases = tests_mapping["testcases"]
         self.assertEqual(
             testcases[0]["config"]["variables"]["var_c"],
-            "${sum_two(1, 2)}"
+            "${sum_two($var_a, $var_b)}"
         )
         self.assertEqual(
             testcases[0]["config"]["variables"]["PROJECT_KEY"],
@@ -439,10 +682,9 @@ class TestParser(unittest.TestCase):
         parsed_testcases = parsed_tests_mapping["testcases"]
         self.assertIsInstance(parsed_testcases, list)
         test_dict1 = parsed_testcases[0]["teststeps"][0]
-        self.assertEqual(test_dict1["variables"]["var_c"], 3)
+        self.assertEqual(test_dict1["variables"]["var_c"].raw_string, "${sum_two($var_a, $var_b)}")
-        self.assertEqual(test_dict1["variables"]["PROJECT_KEY"], "ABCDEFGH")
+        self.assertEqual(test_dict1["variables"]["PROJECT_KEY"].raw_string, "${ENV(PROJECT_KEY)}")
-        self.assertEqual(test_dict1["variables"]["var_d"], test_dict1["variables"]["var_e"])
+        self.assertIsInstance(parsed_testcases[0]["config"]["name"], parser.LazyString)
-        self.assertEqual(parsed_testcases[0]["config"]["name"], '1230')
 
     def test_parse_tests_override_variables(self):
         tests_mapping = {
@@ -471,7 +713,7 @@ class TestParser(unittest.TestCase):
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict1_variables = parsed_tests_mapping["testcases"][0]["teststeps"][0]["variables"]
         self.assertEqual(test_dict1_variables["creator"], "user_test_001")
-        self.assertEqual(test_dict1_variables["username"], "user_test_001")
+        self.assertEqual(test_dict1_variables["username"].raw_string, "$creator")
 
     def test_parse_tests_base_url_priority(self):
         """ base_url & verify: priority test_dict > config
@@ -499,7 +741,7 @@ class TestParser(unittest.TestCase):
         }
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
-        self.assertEqual(test_dict["request"]["url"], "https://httprunner.org/api1")
+        self.assertEqual(test_dict["request"]["url"], "/api1")
         self.assertEqual(test_dict["request"]["verify"], True)
 
     def test_parse_tests_base_url_path_with_variable(self):
@@ -527,7 +769,9 @@ class TestParser(unittest.TestCase):
         }
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
-        self.assertEqual(test_dict["request"]["url"], "https://httprunner.org/api1")
+        self.assertEqual(test_dict["variables"]["host2"], "https://httprunner.org")
+        parsed_test_dict = parser.parse_lazy_data(test_dict, test_dict["variables"])
+        self.assertEqual(parsed_test_dict["request"]["url"], "https://httprunner.org/api1")
 
     def test_parse_tests_base_url_test_dict(self):
         tests_mapping = {
@@ -555,52 +799,10 @@ class TestParser(unittest.TestCase):
         }
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
-        self.assertEqual(test_dict["request"]["url"], "https://httprunner.org/api1")
+        parsed_test_dict = parser.parse_lazy_data(test_dict, test_dict["variables"])
-
+        self.assertEqual(parsed_test_dict["base_url"], "https://httprunner.org")
-    def test_parse_data_with_variables(self):
-        variables = {
-            "host2": "https://httprunner.org",
-            "num3": "${sum_two($num2, 4)}",
-            "num2": "${sum_two($num1, 3)}",
-            "num1": "${sum_two(1, 2)}"
-        }
-        from tests.debugtalk import sum_two
-        functions = {
-            "sum_two": sum_two
-        }
-        parsed_testcase = parser.parse_data(variables, variables, functions)
-        self.assertEqual(parsed_testcase["num3"], 10)
-        self.assertEqual(parsed_testcase["num2"], 6)
-        self.assertEqual(parsed_testcase["num1"], 3)
-
-    def test_parse_data_with_variables_not_found(self):
-        variables = {
-            "host": "https://httprunner.org",
-            "num4": "${sum_two($num0, 5)}",
-            "num3": "${sum_two($num2, 4)}",
-            "num2": "${sum_two($num1, 3)}",
-            "num1": "${sum_two(1, 2)}"
-        }
-        from tests.debugtalk import sum_two
-        functions = {
-            "sum_two": sum_two
-        }
-        with self.assertRaises(exceptions.VariableNotFound):
-            parser.parse_data(variables, variables, functions)
-
-        parsed_testcase = parser.parse_data(
-            variables,
-            variables,
-            functions,
-            raise_if_variable_not_found=False
-        )
-        self.assertEqual(parsed_testcase["num3"], 10)
-        self.assertEqual(parsed_testcase["num2"], 6)
-        self.assertEqual(parsed_testcase["num1"], 3)
-        self.assertEqual(parsed_testcase["num4"], "${sum_two($num0, 5)}")
 
     def test_parse_tests_variable_with_function(self):
-        from tests.debugtalk import sum_two, gen_random_string
         tests_mapping = {
             "project_mapping": {
                 "functions": {
@@ -642,16 +844,18 @@ class TestParser(unittest.TestCase):
         }
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
-        self.assertEqual(test_dict["variables"]["num3"], 10)
+        variables = parser.parse_variables_mapping(test_dict["variables"])
-        self.assertEqual(test_dict["variables"]["num2"], 6)
+        self.assertEqual(variables["num3"], 10)
-        self.assertEqual(test_dict["variables"]["str1"], test_dict["variables"]["str2"])
+        self.assertEqual(variables["num2"], 6)
+        parsed_test_dict = parser.parse_lazy_data(test_dict, variables)
+        self.assertEqual(parsed_test_dict["base_url"], "https://httprunner.org")
         self.assertEqual(
-            test_dict["request"]["url"],
+            parsed_test_dict["request"]["url"],
-            "https://httprunner.org/api1/?num1=3&num2=6&num3=10"
+            "/api1/?num1=3&num2=6&num3=10"
         )
+        self.assertEqual(variables["str1"], variables["str2"])
 
     def test_parse_tests_variable_not_found(self):
-        from tests.debugtalk import sum_two
         tests_mapping = {
             "project_mapping": {
                 "functions": {
@@ -687,15 +891,8 @@ class TestParser(unittest.TestCase):
                 }
             ]
         }
-        parsed_tests_mapping = parser.parse_tests(tests_mapping)
+        with self.assertRaises(exceptions.VariableNotFound):
-        test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
+            parser.parse_tests(tests_mapping)
-        self.assertEqual(test_dict["variables"]["num3"], 10)
-        self.assertEqual(test_dict["variables"]["num2"], 6)
-        self.assertEqual(test_dict["variables"]["num4"], "${sum_two($num0, 5)}")
-        self.assertEqual(
-            test_dict["request"]["url"],
-            "https://httprunner.org/api1/?num1=3&num2=6&num3=10&num4=${sum_two($num0, 5)}"
-        )
 
     def test_parse_tests_base_url_teststep_empty(self):
         """ base_url & verify: priority test_dict > config
@@ -723,7 +920,7 @@ class TestParser(unittest.TestCase):
         }
         parsed_tests_mapping = parser.parse_tests(tests_mapping)
         test_dict = parsed_tests_mapping["testcases"][0]["teststeps"][0]
-        self.assertEqual(test_dict["request"]["url"], "https://debugtalk.com/api1")
+        self.assertEqual(str(test_dict["base_url"]), 'LazyString($host)')
         self.assertEqual(test_dict["request"]["verify"], True)
 
     def test_parse_tests_verify_config_set(self):
@@ -839,7 +1036,7 @@ class TestParser(unittest.TestCase):
                 {"PROJECT_KEY": "${ENV(PROJECT_KEY)}"}
             ]
         }
-        result = parser.parse_data(content)
+        result = parser.eval_lazy_data(content)
 
         content = {
             "variables": [
@@ -847,7 +1044,7 @@ class TestParser(unittest.TestCase):
             ]
         }
         with self.assertRaises(exceptions.ParamsError):
-            parser.parse_data(content)
+            parser.eval_lazy_data(content)
 
         content = {
             "variables": [
@@ -855,7 +1052,7 @@ class TestParser(unittest.TestCase):
             ]
         }
         with self.assertRaises(exceptions.ParamsError):
-            parser.parse_data(content)
+            parser.eval_lazy_data(content)
 
     def test_extend_with_api(self):
         loader.load_project_tests(os.path.join(os.getcwd(), "tests"))

tests/test_runner.py

@@ -1,7 +1,7 @@
 import os
 import time
 
-from httprunner import exceptions, loader, runner
+from httprunner import exceptions, loader, parser, runner
 from httprunner.utils import deep_update_dict
 from tests.api_server import HTTPBIN_SERVER
 from tests.base import ApiServerUnittest
@@ -37,7 +37,11 @@ class TestRunner(ApiServerUnittest):
 
         for testcase_file_path in testcase_file_path_list:
             testcases = loader.load_file(testcase_file_path)
-
+            testcases = parser.prepare_lazy_data(
+                testcases,
+                self.debugtalk_functions,
+                {"expect_status_code", "token_len", "token", "success"}
+            )
             config_dict = {}
             test_runner = runner.Runner(config_dict, self.debugtalk_functions)
 
@@ -83,7 +87,7 @@ class TestRunner(ApiServerUnittest):
             "name": "basic test with httpbin",
             "base_url": HTTPBIN_SERVER,
             "setup_hooks": [
-                "${sleep_N_secs(0.5)}"
+                "${sleep_N_secs(0.5)}",
                 "${hook_print(setup)}"
             ],
             "teardown_hooks": [
@@ -91,6 +95,13 @@ class TestRunner(ApiServerUnittest):
                 "${hook_print(teardown)}"
             ]
         }
+        prepared_config_dict = parser.prepare_lazy_data(config_dict, self.debugtalk_functions)
+        test_runner = runner.Runner(prepared_config_dict, self.debugtalk_functions)
+        end_time = time.time()
+        # check if testcase setup hook executed
+        self.assertGreater(end_time - start_time, 0.5)
+
+        start_time = time.time()
         test = {
             "name": "get token",
             "request": {
@@ -111,12 +122,6 @@ class TestRunner(ApiServerUnittest):
                 {"check": "status_code", "expect": 200}
             ]
         }
-        test_runner = runner.Runner(config_dict, self.debugtalk_functions)
-        end_time = time.time()
-        # check if testcase setup hook executed
-        self.assertGreater(end_time - start_time, 0.5)
-
-        start_time = time.time()
         test_runner.run_test(test)
         test_runner.run_test(test)
         end_time = time.time()
@@ -130,6 +135,7 @@ class TestRunner(ApiServerUnittest):
         }
         test = {
             "name": "modify request headers",
+            "base_url": HTTPBIN_SERVER,
             "request": {
                 "url": "/anything",
                 "method": "POST",
@@ -146,8 +152,9 @@ class TestRunner(ApiServerUnittest):
                 {"check": "status_code", "expect": 200}
             ]
         }
+        parsed_test = parser.prepare_lazy_data(test, self.debugtalk_functions)
         test_runner = runner.Runner(config_dict, self.debugtalk_functions)
-        test_runner.run_test(test)
+        test_runner.run_test(parsed_test)
         test_variables_mapping = test_runner.session_context.test_variables_mapping
         self.assertEqual(test_variables_mapping["total"], 6)
         self.assertEqual(test_variables_mapping["request"]["data"], "a=1&b=2")
@@ -159,6 +166,7 @@ class TestRunner(ApiServerUnittest):
         }
         test = {
             "name": "modify request headers",
+            "base_url": HTTPBIN_SERVER,
             "request": {
                 "url": "/anything",
                 "method": "POST",
@@ -180,7 +188,8 @@ class TestRunner(ApiServerUnittest):
             ]
         }
         test_runner = runner.Runner(config_dict, self.debugtalk_functions)
-        test_runner.run_test(test)
+        parsed_test = parser.prepare_lazy_data(test, self.debugtalk_functions, {"request"})
+        test_runner.run_test(parsed_test)
 
     def test_run_testcase_with_teardown_hooks_success(self):
         test = {
@@ -232,8 +241,9 @@ class TestRunner(ApiServerUnittest):
             ],
             "teardown_hooks": ["${teardown_hook_sleep_N_secs($response, 2)}"]
         }
+        prepared_test = parser.prepare_lazy_data(test, self.debugtalk_functions, {"response"})
         start_time = time.time()
-        self.test_runner.run_test(test)
+        self.test_runner.run_test(prepared_test)
         end_time = time.time()
         # check if teardown function executed
         self.assertGreater(end_time - start_time, 2)