Using MicroProfile Rest Client For System Testing

A JAX-RS resource:


@Path("ping")
public class PingResource {

    @GET
    public String ping() {
        return "Enjoy Java EE 8!";
    }

}    
...can be system tested (checkout: http://javaeetesting.com) with MicroProfile Rest Client by describing the resource with an interface:

import javax.ws.rs.GET;
import javax.ws.rs.Path;
        
@Path("/restclient/resources/ping")
public interface PingClient {

    @GET
    String ping();
}
    
...and creating a proxy implementation with RestClientBuilder:

import java.net.MalformedURLException;
import java.net.URI;
import org.eclipse.microprofile.rest.client.RestClientBuilder;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;


public class RestClientTest {

    @Test
    public void init() throws MalformedURLException {
        URI baseURI = URI.create("http://localhost:8080");
        PingClient client = RestClientBuilder.newBuilder().
                baseUri(baseURI).
                build(PingClient.class);                
        assertNotNull(client);
        String result = client.ping();
        assertNotNull(result);
    }
}

You will need the following dependencies to run the system test from your IDE / CLI:


<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>8.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.cxf</groupId>
        <artifactId>cxf-rt-rs-mp-client</artifactId>
        <version>3.3.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>    

Project created with javaee8-essentials-archetype, the 3kB ThinWAR was built and deployed with: wad.sh in 2940ms

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