JAX-RSでコンテキストの取得 ref: http://qiita.com/takaki@github/items/7e5abaca0d96261cb3a9

ContextResource.java

package example.jaxrs;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.UriInfo;

@Path("/")
public class ContextResource {

    @GET
    @Path("uriinfo")
    public String uriinfo(@Context UriInfo uriInfo) {
        return uriInfo.getPath() + ";" + uriInfo.getQueryParameters().getFirst("foo");
    }

    @GET
    @Path("headers")
    public String headers(@Context HttpHeaders headers) {
        return headers.getHeaderString("X-Qiita-Demo");
    }
}

ContextResourceTest.groovy

package example.jaxrs

import org.glassfish.jersey.server.ResourceConfig
import org.glassfish.jersey.test.JerseyTest
import spock.lang.Shared
import spock.lang.Specification

import javax.ws.rs.core.Application

class ContextResourceTest extends Specification {
    @Shared
    def jerseyTest = new JerseyTest() {
        @Override
        protected Application configure() {
            return new ResourceConfig(ContextResource.class)
        }
    }

    def setupSpec() {
        jerseyTest.setUp()
    }

    def cleanupSpec() {
        jerseyTest.tearDown()
    }


    def "test uriinfo"() {
        when:
        def response = jerseyTest.target("/uriinfo").queryParam("foo", "bar").request().get()

        then:
        response.readEntity(String.class) == "uriinfo;bar"
    }

    def "test headers"() {
        when:
        def response = jerseyTest.target("/headers").request().header("X-Qiita-Demo", "Foo Bar").get()

        then:
        response.readEntity(String.class) == "Foo Bar"
    }
}