Integration-Tests.md

@@ -31,3 +31,15 @@ To test it locally, please run `mvn integration-test`
 Please update [pom.xml](https://github.com/openapitools/openapi-generator/blob/master/pom.xml).
 
 For example, search for "ruby" in pom.xml to see how the Ruby petstore folder is added.
+
+**3. Run the test server locally**
+
+To setup the test server locally, please run
+
+`docker pull swaggerapi/petstore`
+
+`docker run -d -e SWAGGER_HOST=http://petstore.swagger.io -e SWAGGER_BASE_PATH=/v2 -p 80:8080 swaggerapi/petstore`
+
+and add the following entry to your host table:
+
+`127.0.0.1    petstore.swagger.io`
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