diff --git a/README.md b/README.md
index d42e2fa2..0c3ecda6 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ To ensure the installation or upgrade is successful, you can execute command `at
 
 ```text
 $ ate -V
-ApiTestEngine version: 0.7.0
+ApiTestEngine version: 0.7.4
 ```
 
 Execute the command `ate -h` to view command help.
@@ -75,7 +75,7 @@ To install mail helper, run this command in your terminal:
 $ pip install -U git+https://github.com/debugtalk/jenkins-mail-py.git#egg=jenkins-mail-py
 $ ate -V
 jenkins-mail-py version: 0.2.5
-ApiTestEngine version: 0.7.0
+ApiTestEngine version: 0.7.4
 ```
 
 With [`jenkins-mail-py`][jenkins-mail-py] installed, you can see more optional arguments.
@@ -283,7 +283,8 @@ $ python main-locust -h
 - [《ApiTestEngine 演进之路（2）探索优雅的测试用例描述方式》](http://debugtalk.com/post/ApiTestEngine-2-best-testcase-description/)
 - [《ApiTestEngine 演进之路（3）测试用例中实现 Python 函数的定义》](http://debugtalk.com/post/ApiTestEngine-3-define-functions-in-yaml-testcases/)
 - [《ApiTestEngine 演进之路（4）测试用例中实现 Python 函数的调用》](http://debugtalk.com/post/ApiTestEngine-4-call-functions-in-yaml-testcases/)
-
+- [《ApiTestEngine 集成 Locust 实现更好的性能测试体验》](http://debugtalk.com/post/apitestengine-supersede-locust/)
+- [《约定大于配置：ApiTestEngine实现热加载机制》](http://debugtalk.com/post/apitestengine-hot-plugin/)
 
 [requests]: http://docs.python-requests.org/en/master/
 [unittest]: https://docs.python.org/3/library/unittest.html
diff --git a/ate/runner.py b/ate/runner.py
index 298b9372..a19a5a44 100644
--- a/ate/runner.py
+++ b/ate/runner.py
@@ -197,10 +197,9 @@ class Runner(object):
             try:
                 result = self._run_testset(testset, mapping)
                 assert result["success"]
+                output.update(result["output"])
             except AssertionError:
                 success = False
-            finally:
-                output.update(result["output"])
 
         return {
             "success": success,
diff --git a/ate/testcase.py b/ate/testcase.py
index fd4dd829..dcd4c51e 100644
--- a/ate/testcase.py
+++ b/ate/testcase.py
@@ -12,6 +12,7 @@ test_def_overall_dict = {
     "api": {},
     "suite": {}
 }
+testcases_cache_mapping = {}
 
 
 def extract_variables(content):
@@ -149,16 +150,25 @@ def load_testcases_by_path(path):
     if not os.path.isabs(path):
         path = os.path.join(os.getcwd(), path)
 
+    if path in testcases_cache_mapping:
+        return testcases_cache_mapping[path]
+
     if os.path.isdir(path):
         files_list = utils.load_folder_files(path)
-        return load_testcases_by_path(files_list)
+        testcases_list = load_testcases_by_path(files_list)
 
     elif os.path.isfile(path):
         testset = load_test_file(path)
         if testset["testcases"] or testset["api"]:
-            return [testset]
+            testcases_list = [testset]
+        else:
+            testcases_list = []
 
-    return []
+    else:
+        testcases_list = []
+
+    testcases_cache_mapping[path] = testcases_list
+    return testcases_list
 
 def load_test_file(file_path):
     """ load testset file, get testset data structure.
diff --git a/tests/api/demo.yml b/tests/api/demo.yml
index 1e641a54..ee752e39 100644
--- a/tests/api/demo.yml
+++ b/tests/api/demo.yml
@@ -24,3 +24,46 @@
         json:
             name: $user_name
             password: $user_password
+
+- api:
+    def: get_user($uid, $token)
+    request:
+        url: /api/users/$uid
+        method: GET
+        headers:
+            token: $token
+
+- api:
+    def: update_user($uid, $user_name, $user_password, $token)
+    request:
+        url: /api/users/$uid
+        method: PUT
+        headers:
+            token: $token
+        json:
+            name: $user_name
+            password: $user_password
+
+- api:
+    def: delete_user($uid, $token)
+    request:
+        url: /api/users/$uid
+        method: DELETE
+        headers:
+            token: $token
+
+- api:
+    def: get_users($token)
+    request:
+        url: /api/users
+        method: GET
+        headers:
+            token: $token
+
+- api:
+    def: reset_all($token)
+    request:
+        url: /api/reset-all
+        method: GET
+        headers:
+            token: $token
diff --git a/tests/api_server.py b/tests/api_server.py
index 98a09032..8517dc70 100644
--- a/tests/api_server.py
+++ b/tests/api_server.py
@@ -1,5 +1,4 @@
 import hashlib
-import hmac
 import json
 from functools import wraps
 
@@ -184,6 +183,7 @@ def update_user(uid):
         user = request.get_json()
         success = True
         status_code = 200
+        users_dict[uid] = user
     else:
         success = False
         status_code = 404
diff --git a/tests/data/demo_testset_layer.yml b/tests/data/demo_testset_layer.yml
index 87758abf..d731c18a 100644
--- a/tests/data/demo_testset_layer.yml
+++ b/tests/data/demo_testset_layer.yml
@@ -20,14 +20,18 @@
         - token: content.token
 
 - test:
-    name: create user which does not exist
-    variable_binds:
-        - user_name: "user1"
-        - user_password: "123456"
-    api: create_user(1000, $user_name, $user_password, $token)
+    name: reset all users
+    api: reset_all($token)
     validators:
-        - {"check": "status_code", "comparator": "eq", "expected": 201}
-        - {"check": "content.success", "comparator": "eq", "expected": true}
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.success", "expected": true}
+
+- test:
+    name: get user that does not exist
+    api: get_user(1000, $token)
+    validators:
+        - {"check": "status_code", "expected": 404}
+        - {"check": "content.success", "expected": false}
 
 - test:
     name: create user which does not exist
@@ -36,5 +40,79 @@
         - user_password: "123456"
     api: create_user(1000, $user_name, $user_password, $token)
     validators:
-        - {"check": "status_code", "comparator": "eq", "expected": 500}
-        - {"check": "content.success", "comparator": "eq", "expected": false}
+        - {"check": "status_code", "expected": 201}
+        - {"check": "content.success", "expected": true}
+
+- test:
+    name: get user that has been created
+    api: get_user(1000, $token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.success", "expected": true}
+        - {"check": "content.data.password", "expected": "123456"}
+
+- test:
+    name: create user which exists
+    variable_binds:
+        - user_name: "user1"
+        - user_password: "123456"
+    api: create_user(1000, $user_name, $user_password, $token)
+    validators:
+        - {"check": "status_code", "expected": 500}
+        - {"check": "content.success", "expected": false}
+
+- test:
+    name: update user which exists
+    variable_binds:
+        - user_name: "user1"
+        - user_password: "654321"
+    api: update_user(1000, $user_name, $user_password, $token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.success", "expected": true}
+
+- test:
+    name: get user that has been created
+    api: get_user(1000, $token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.success", "expected": true}
+        - {"check": "content.data.password", "expected": "654321"}
+
+- test:
+    name: get users
+    api: get_users($token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.count", "expected": 1}
+
+- test:
+    name: delete user that exists
+    api: delete_user(1000, $token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.success", "expected": true}
+
+- test:
+    name: get users
+    api: get_users($token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.count", "expected": 0}
+
+- test:
+    name: create user which has been deleted
+    variable_binds:
+        - user_name: "user1"
+        - user_password: "123456"
+    api: create_user(1000, $user_name, $user_password, $token)
+    validators:
+        - {"check": "status_code", "expected": 201}
+        - {"check": "content.success", "expected": true}
+
+- test:
+    name: get users
+    api: get_users($token)
+    validators:
+        - {"check": "status_code", "expected": 200}
+        - {"check": "content.count", "expected": 1}