HttpRunner 2.0 is comming!

1, new design for testcase format;
2, refactor testcase layer mechanism.

tests/testcases/create_and_check.yml

@@ -0,0 +1,47 @@
+
+- config:
+    name: "create user and check result."
+    id: create_and_check
+    variables:
+        - uid: 9001
+        - token: XXX
+        - device_sn: "TESTCASE_CREATE_XXX"
+    base_url: "http://127.0.0.1:5000"
+
+- test:
+    name: setup and reset all (override).
+    testcase: testcases/setup.yml
+    output:
+        - token
+
+- test:
+    name: make sure user $uid does not exist
+    api: get_user
+    variables:
+        - uid: $uid
+        - token: $token
+    validate:
+        - eq: ["status_code", 404]
+        - eq: ["content.success", false]
+
+- test:
+    name: create user $uid
+    api: create_user
+    variables:
+        - user_name: "user1"
+        - user_password: "123456"
+        - uid: $uid
+        - token: $token
+    validate:
+        - eq: ["status_code", 201]
+        - eq: ["content.success", true]
+
+- test:
+    name: check if user $uid exists
+    api: get_user
+    variables:
+        - uid: $uid
+        - token: $token
+    validate:
+        - eq: ["status_code", 200]
+        - eq: ["content.success", true]