diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 5bb94260..0ba4a75d 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,12 +1,23 @@
 # Release History
 
-## 3.0.7 (2020-06-01)
+## 3.0.7 (2020-06-03)
+
+**Added**
+
+- feat: make pytest files in chain style
 
 **Fixed**
 
 - fix: convert jmespath.search result to int/float unintentionally
 - fix: referenced testcase should not be run duplicately
 - fix: requests.cookies.CookieConflictError, multiple cookies with name
+- fix: missing exit code from pytest
+- fix: skip invalid testcase/testsuite yaml/json file
+
+**Changed**
+
+- change: generate pytest in chain style by default
+- docs: update sponsor info
 
 ## 3.0.6 (2020-05-29)
 
diff --git a/examples/httpbin/__init__.py b/examples/httpbin/__init__.py
new file mode 100644
index 00000000..70cfba53
--- /dev/null
+++ b/examples/httpbin/__init__.py
@@ -0,0 +1 @@
+# NOTICE: Generated By HttpRunner. DO NOT EDIT!
diff --git a/examples/httpbin/basic_test.py b/examples/httpbin/basic_test.py
index 91ffac52..6f03ae4a 100644
--- a/examples/httpbin/basic_test.py
+++ b/examples/httpbin/basic_test.py
@@ -1,105 +1,76 @@
 # NOTICE: Generated By HttpRunner. DO NOT EDIT!
 # FROM: examples/httpbin/basic.yml
 
-from httprunner import HttpRunner, TConfig, TStep
+from httprunner import HttpRunner, Config, Step, RunRequest, RunTestCase
 
 
 class TestCaseBasic(HttpRunner):
-    config = TConfig(
-        **{
-            "name": "basic test with httpbin",
-            "base_url": "https://httpbin.org/",
-            "path": "examples/httpbin/basic_test.py",
-            "variables": {},
-        }
-    )
+    config = Config("basic test with httpbin").base_url("https://httpbin.org/")
 
     teststeps = [
-        TStep(
-            **{
-                "name": "headers",
-                "request": {"url": "/headers", "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.headers.Host", "httpbin.org"]},
-                ],
-            }
+        Step(
+            RunRequest("headers")
+            .get("/headers")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.headers.Host", "httpbin.org")
         ),
-        TStep(
-            **{
-                "name": "user-agent",
-                "request": {"url": "/user-agent", "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"startswith": ['body."user-agent"', "python-requests"]},
-                ],
-            }
+        Step(
+            RunRequest("user-agent")
+            .get("/user-agent")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_startswith('body."user-agent"', "python-requests")
         ),
-        TStep(
-            **{
-                "name": "get without params",
-                "request": {"url": "/get", "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}, {"eq": ["body.args", {}]}],
-            }
+        Step(
+            RunRequest("get without params")
+            .get("/get")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.args", {})
         ),
-        TStep(
-            **{
-                "name": "get with params in url",
-                "request": {"url": "/get?a=1&b=2", "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.args", {"a": "1", "b": "2"}]},
-                ],
-            }
+        Step(
+            RunRequest("get with params in url")
+            .get("/get?a=1&b=2")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.args", {"a": "1", "b": "2"})
         ),
-        TStep(
-            **{
-                "name": "get with params in params field",
-                "request": {"url": "/get", "params": {"a": 1, "b": 2}, "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.args", {"a": "1", "b": "2"}]},
-                ],
-            }
+        Step(
+            RunRequest("get with params in params field")
+            .get("/get")
+            .with_params(**{"a": 1, "b": 2})
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.args", {"a": "1", "b": "2"})
         ),
-        TStep(
-            **{
-                "name": "set cookie",
-                "request": {"url": "/cookies/set?name=value", "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.cookies.name", "value"]},
-                ],
-            }
+        Step(
+            RunRequest("set cookie")
+            .get("/cookies/set?name=value")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.cookies.name", "value")
         ),
-        TStep(
-            **{
-                "name": "extract cookie",
-                "request": {"url": "/cookies", "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.cookies.name", "value"]},
-                ],
-            }
+        Step(
+            RunRequest("extract cookie")
+            .get("/cookies")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.cookies.name", "value")
         ),
-        TStep(
-            **{
-                "name": "post data",
-                "request": {
-                    "url": "/post",
-                    "method": "POST",
-                    "headers": {"Content-Type": "application/json"},
-                    "data": "abc",
-                },
-                "validate": [{"eq": ["status_code", 200]}],
-            }
+        Step(
+            RunRequest("post data")
+            .post("/post")
+            .with_headers(**{"Content-Type": "application/json"})
+            .with_data("abc")
+            .validate()
+            .assert_equal("status_code", 200)
         ),
-        TStep(
-            **{
-                "name": "validate body length",
-                "request": {"url": "/spec.json", "method": "GET"},
-                "validate": [{"len_eq": ["body", 9]}],
-            }
+        Step(
+            RunRequest("validate body length")
+            .get("/spec.json")
+            .validate()
+            .assert_length_equal("body", 9)
         ),
     ]
 
diff --git a/examples/httpbin/hooks_test.py b/examples/httpbin/hooks_test.py
index 0e86ee6b..f0f22952 100644
--- a/examples/httpbin/hooks_test.py
+++ b/examples/httpbin/hooks_test.py
@@ -1,48 +1,27 @@
 # NOTICE: Generated By HttpRunner. DO NOT EDIT!
 # FROM: examples/httpbin/hooks.yml
 
-from httprunner import HttpRunner, TConfig, TStep
+from httprunner import HttpRunner, Config, Step, RunRequest, RunTestCase
 
 
 class TestCaseHooks(HttpRunner):
-    config = TConfig(
-        **{
-            "name": "basic test with httpbin",
-            "base_url": "${get_httpbin_server()}",
-            "setup_hooks": ["${hook_print(setup)}"],
-            "teardown_hooks": ["${hook_print(teardown)}"],
-            "path": "examples/httpbin/hooks_test.py",
-            "variables": {},
-        }
-    )
+    config = Config("basic test with httpbin").base_url("${get_httpbin_server()}")
 
     teststeps = [
-        TStep(
-            **{
-                "name": "headers",
-                "variables": {"a": 123},
-                "request": {"url": "/headers", "method": "GET"},
-                "setup_hooks": [
-                    "${setup_hook_add_kwargs($request)}",
-                    "${setup_hook_remove_kwargs($request)}",
-                ],
-                "teardown_hooks": ["${teardown_hook_sleep_N_secs($response, 1)}"],
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"contained_by": ["body.headers.Host", "${get_httpbin_server()}"]},
-                ],
-            }
+        Step(
+            RunRequest("headers")
+            .with_variables(**{"a": 123})
+            .get("/headers")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_contained_by("body.headers.Host", "${get_httpbin_server()}")
         ),
-        TStep(
-            **{
-                "name": "alter response",
-                "request": {"url": "/headers", "method": "GET"},
-                "teardown_hooks": ["${alter_response($response)}"],
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.headers.Host", "httpbin.org"]},
-                ],
-            }
+        Step(
+            RunRequest("alter response")
+            .get("/headers")
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.headers.Host", "httpbin.org")
         ),
     ]
 
diff --git a/examples/httpbin/load_image_test.py b/examples/httpbin/load_image_test.py
index 2e69653d..1c276343 100644
--- a/examples/httpbin/load_image_test.py
+++ b/examples/httpbin/load_image_test.py
@@ -1,47 +1,36 @@
 # NOTICE: Generated By HttpRunner. DO NOT EDIT!
 # FROM: examples/httpbin/load_image.yml
 
-from httprunner import HttpRunner, TConfig, TStep
+from httprunner import HttpRunner, Config, Step, RunRequest, RunTestCase
 
 
 class TestCaseLoadImage(HttpRunner):
-    config = TConfig(
-        **{
-            "name": "load images",
-            "base_url": "${get_httpbin_server()}",
-            "path": "examples/httpbin/load_image_test.py",
-            "variables": {},
-        }
-    )
+    config = Config("load images").base_url("${get_httpbin_server()}")
 
     teststeps = [
-        TStep(
-            **{
-                "name": "get png image",
-                "request": {"url": "/image/png", "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}],
-            }
+        Step(
+            RunRequest("get png image")
+            .get("/image/png")
+            .validate()
+            .assert_equal("status_code", 200)
         ),
-        TStep(
-            **{
-                "name": "get jpeg image",
-                "request": {"url": "/image/jpeg", "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}],
-            }
+        Step(
+            RunRequest("get jpeg image")
+            .get("/image/jpeg")
+            .validate()
+            .assert_equal("status_code", 200)
         ),
-        TStep(
-            **{
-                "name": "get webp image",
-                "request": {"url": "/image/webp", "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}],
-            }
+        Step(
+            RunRequest("get webp image")
+            .get("/image/webp")
+            .validate()
+            .assert_equal("status_code", 200)
         ),
-        TStep(
-            **{
-                "name": "get svg image",
-                "request": {"url": "/image/svg", "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}],
-            }
+        Step(
+            RunRequest("get svg image")
+            .get("/image/svg")
+            .validate()
+            .assert_equal("status_code", 200)
         ),
     ]
 
diff --git a/examples/httpbin/validate.yml b/examples/httpbin/validate.yml
index c45e2ffd..d5769a7b 100644
--- a/examples/httpbin/validate.yml
+++ b/examples/httpbin/validate.yml
@@ -13,8 +13,8 @@ teststeps:
         method: GET
     validate:
         - eq: ["status_code", 200]
-        - eq: ["body.args.a", 1]
-        - eq: ["body.args.b", 2]
+        - eq: ["body.args.a", "1"]
+        - eq: ["body.args.b", "2"]
     validate_script:
         - "assert status_code == 200"
 
diff --git a/examples/httpbin/validate_test.py b/examples/httpbin/validate_test.py
index fdf2c8a4..24a48178 100644
--- a/examples/httpbin/validate_test.py
+++ b/examples/httpbin/validate_test.py
@@ -1,43 +1,28 @@
 # NOTICE: Generated By HttpRunner. DO NOT EDIT!
 # FROM: examples/httpbin/validate.yml
 
-from httprunner import HttpRunner, TConfig, TStep
+from httprunner import HttpRunner, Config, Step, RunRequest, RunTestCase
 
 
 class TestCaseValidate(HttpRunner):
-    config = TConfig(
-        **{
-            "name": "basic test with httpbin",
-            "base_url": "http://httpbin.org/",
-            "path": "examples/httpbin/validate_test.py",
-            "variables": {},
-        }
-    )
+    config = Config("basic test with httpbin").base_url("http://httpbin.org/")
 
     teststeps = [
-        TStep(
-            **{
-                "name": "validate response with json path",
-                "request": {"url": "/get", "params": {"a": 1, "b": 2}, "method": "GET"},
-                "validate": [
-                    {"eq": ["status_code", 200]},
-                    {"eq": ["body.args.a", 1]},
-                    {"eq": ["body.args.b", 2]},
-                ],
-                "validate_script": ["assert status_code == 200"],
-            }
+        Step(
+            RunRequest("validate response with json path")
+            .get("/get")
+            .with_params(**{"a": 1, "b": 2})
+            .validate()
+            .assert_equal("status_code", 200)
+            .assert_equal("body.args.a", "1")
+            .assert_equal("body.args.b", "2")
         ),
-        TStep(
-            **{
-                "name": "validate response with python script",
-                "request": {"url": "/get", "params": {"a": 1, "b": 2}, "method": "GET"},
-                "validate": [{"eq": ["status_code", 200]}],
-                "validate_script": [
-                    "assert status_code == 201",
-                    "a = response_json.get('args').get('a')",
-                    "assert a == '1'",
-                ],
-            }
+        Step(
+            RunRequest("validate response with python script")
+            .get("/get")
+            .with_params(**{"a": 1, "b": 2})
+            .validate()
+            .assert_equal("status_code", 200)
         ),
     ]
 
diff --git a/examples/postman_echo/conftest.py b/examples/postman_echo/conftest.py
deleted file mode 100644
index 9bb834e6..00000000
--- a/examples/postman_echo/conftest.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# NOTICE: Generated By HttpRunner.
-import json
-import os
-import time
-
-import pytest
-from loguru import logger
-
-from httprunner.utils import get_platform
-
-
-@pytest.fixture(scope="session", autouse=True)
-def session_fixture(request):
-    """setup and teardown each task"""
-    logger.info(f"start running testcases ...")
-
-    start_at = time.time()
-
-    yield
-
-    logger.info(f"task finished, generate task summary for --save-tests")
-
-    summary = {
-        "success": True,
-        "stat": {
-            "testcases": {"total": 0, "success": 0, "fail": 0},
-            "teststeps": {"total": 0, "failures": 0, "successes": 0},
-        },
-        "time": {"start_at": start_at, "duration": time.time() - start_at},
-        "platform": get_platform(),
-        "details": [],
-    }
-
-    for item in request.node.items:
-        testcase_summary = item.instance.get_summary()
-        summary["success"] &= testcase_summary.success
-
-        summary["stat"]["testcases"]["total"] += 1
-        summary["stat"]["teststeps"]["total"] += len(testcase_summary.step_datas)
-        if testcase_summary.success:
-            summary["stat"]["testcases"]["success"] += 1
-            summary["stat"]["teststeps"]["successes"] += len(
-                testcase_summary.step_datas
-            )
-        else:
-            summary["stat"]["testcases"]["fail"] += 1
-            summary["stat"]["teststeps"]["successes"] += (
-                len(testcase_summary.step_datas) - 1
-            )
-            summary["stat"]["teststeps"]["failures"] += 1
-
-        summary["details"].append(testcase_summary.dict())
-
-    summary_path = "/Users/debugtalk/MyProjects/HttpRunner-dev/HttpRunner/examples/postman_echo/logs/request_methods/hardcode.summary.json"
-    summary_dir = os.path.dirname(summary_path)
-    os.makedirs(summary_dir, exist_ok=True)
-
-    with open(summary_path, "w", encoding="utf-8") as f:
-        json.dump(summary, f, indent=4)
-
-    logger.info(f"generated task summary: {summary_path}")
-