Mocking HTTP Server Responses in Junit

BaseHttpServerIntegrationTest.groovy

import org.junit.AfterClass
import org.junit.BeforeClass
import org.mortbay.jetty.Server
import org.springframework.core.io.ClassPathResource

abstract class BaseHttpServerIntegrationTest {
    static Server server

    @BeforeClass
    static void createServer() {
        server = new Server(8081)
        def resources = [
                "/zuul/settings/prod/app-data-config.properties" :new ClassPathResource("/mock-server-response.properties")
        ]
        server.handler = new ResourceRequestHandler(resources: resources)
        server.start()
    }

    @AfterClass
    static void stopServer() {
        server.stop()
    }

}

dependencies.xml

<!-- part of pom.xml -->
<dependencies>
  <!-- for embedded http server testing -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <scope>test</scope>
    </dependency>  
    <dependency>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty</artifactId>
        <version>6.1.25</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

ResourceRequestHandler.groovy

import org.mortbay.jetty.handler.AbstractHandler
import org.springframework.core.io.Resource

import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

class ResourceRequestHandler extends AbstractHandler {
    Map<String, Resource> resources

    void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) {
        response.status = HttpServletResponse.SC_OK
        response.outputStream << resources[target].inputStream

    }
}

Useful for mocking out http client requests when testing web services, etc..