docs: Add back end E2E test document

docs/back-end-e2e.md

@@ -0,0 +1,87 @@
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+
+This document describes how to use E2E test locally.
+
+1. To run back end E2E test, please start the `manager-api`, `admin-api`, etcd and upstream node at first.
+
+2. To start the `manager-api` project locally, please refer to [develop](./develop.md) web section.
+
+3. To start the etcd locally, please refer to [etcd start](https://github.com/apache/apisix/blob/master/doc/install-dependencies.md) web section.
+
+4. To start the `admin-api` project locally, please refer to [admin-api start](https://github.com/apache/apisix#get-started) web section.
+
+5. To start the upstream node locally, please install docker in the local environment and execute the command.
+
+   ```sh
+    docker run -d --name upstream -v /(Your apisix-dashboard folder path)/api/test/docker/upstream.conf:/etc/nginx/conf.d/default.conf:ro -p 80:80 -p 1980:1980 -p 1981:1981 -p 1982:1982 -p 1983:1983 -p 1984:1984 johz/upstream:v2.0
+   ```
+
+6. After all the services are started, you can start the back-end E2E test.
+
+7. The upstream node IP is temporarily changed to the local IP address. After the test, it should be changed to GitHub upstream node IP. If the test case does not involve the upstream node, it does not need to be modified.
+
+   ```sh
+    # Local E2E test create route example
+    {
+        "uris": ["/test-test"],
+        "name": "route_all",
+        "desc": "test",
+        "methods": ["GET"],
+        "hosts": ["test.com"],
+        "status": 1,
+        "upstream": {
+            "nodes": {
+                # upstream node IP is required for local test
+                "(local ip):1981": 1
+            },
+            "type": "roundrobin"
+         }
+    }
+
+     # GitHub E2E test create route example
+    {
+        "uris": ["/test-test"],
+        "name": "route_all",
+        "desc": "test",
+        "methods": ["GET"],
+        "hosts": ["test.com"],
+        "status": 1,
+        "upstream": {
+            "nodes": {
+                "172.16.238.20:1981": 1
+            },
+            "type": "roundrobin"
+         }
+    }
+   ```
+
+8. Enter the E2E folder and execute the command to test all E2E test files.
+
+   ```sh
+    cd /(Your apisix-dashboard folder path)/api/test/e2e
+    go test -v
+   ```
+
+9. You can also do E2E test on a single file.
+
+   ```sh
+    cd /(Your apisix-dashboard folder path)/api/test/e2e
+    go test -v E2E-test-file.go base.go
+   ```

docs/develop.md

@@ -55,6 +55,8 @@ $ make api-stop
 
 4. Please refer to the [FAQ](./FAQ.md) about the problem of displaying exception in the dashboard after adding custom plugins or modifying plugin's schema.
 
+5. If writing an back end E2E test, please refer to the [Back End E2E Writing Guide](./back-end-e2e.md)
+
 ### web
 
 1. Go to the `web` directory.
@@ -73,4 +75,4 @@ $ yarn install
 $ yarn start
 ```
 
-4. If writing an E2E test, refer to the [E2E Writing Guide](./front-end-e2e.md)
+4. If writing an front end E2E test, please refer to the [Front End E2E Writing Guide](./front-end-e2e.md)