save api in individual file: each file is corresponding to one api definition

tests/api/get_token.yml

@@ -0,0 +1,22 @@
+name: get token
+variables:
+    user_agent: XXX
+    device_sn: API_XXX
+    os_platform: XXX
+    app_version: XXX
+request:
+    url: /api/get-token
+    method: POST
+    headers:
+        user_agent: $user_agent
+        device_sn: $device_sn
+        os_platform: $os_platform
+        app_version: $app_version
+        Content-Type: "application/json"
+        device_sn: $device_sn
+    json:
+        sign: ${get_sign($user_agent, $device_sn, $os_platform, $app_version)}
+validate:
+    - eq: ["status_code", 0]
+    - len_eq: ["content.token", 12]
+    - contains: [{"a": 1, "b": 2}, "a"]