ONOS-792 Implement Unit Tests for Links and Devices REST APIs

Also added a missing attribute to the Devices codec

Change-Id: I824a3559ca6278297a52169249f413c850204a9b

@@ -33,12 +33,14 @@ public class DeviceCodec extends AnnotatedCodec<Device> {
         DeviceService service = context.get(DeviceService.class);
         DeviceService service = context.get(DeviceService.class);
         ObjectNode result = context.mapper().createObjectNode()
         ObjectNode result = context.mapper().createObjectNode()
                 .put("id", device.id().toString())
                 .put("id", device.id().toString())
+                .put("type", device.type().name())
                 .put("available", service.isAvailable(device.id()))
                 .put("available", service.isAvailable(device.id()))
                 .put("role", service.getRole(device.id()).toString())
                 .put("role", service.getRole(device.id()).toString())
                 .put("mfr", device.manufacturer())
                 .put("mfr", device.manufacturer())
                 .put("hw", device.hwVersion())
                 .put("hw", device.hwVersion())
                 .put("sw", device.swVersion())
                 .put("sw", device.swVersion())
-                .put("serial", device.serialNumber());
+                .put("serial", device.serialNumber())
+                .put("chassisId", device.chassisId().toString());
         return annotate(result, device, context);
         return annotate(result, device, context);
     }
     }
 
 

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.rest;
+
+import java.util.List;
+
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeMatcher;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.osgi.ServiceDirectory;
+import org.onlab.osgi.TestServiceDirectory;
+import org.onlab.rest.BaseResource;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.impl.CodecManager;
+import org.onosproject.net.DefaultPort;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.Port;
+import org.onosproject.net.device.DeviceService;
+
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import com.google.common.collect.ImmutableList;
+import com.sun.jersey.api.client.UniformInterfaceException;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.test.framework.JerseyTest;
+
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.isA;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.fail;
+import static org.onosproject.net.NetTestTools.device;
+import static org.onosproject.net.NetTestTools.did;
+import static org.onosproject.net.PortNumber.portNumber;
+
+/**
+ * Unit tests for devices REST APIs.
+ */
+public class DevicesResourceTest extends JerseyTest {
+    DeviceService mockDeviceService;
+
+    /**
+     * Constructs the test.
+     */
+    public DevicesResourceTest() {
+        super("org.onosproject.rest");
+    }
+
+    /**
+     * Hamcrest matcher to check that an device representation in JSON matches
+     * the actual device.
+     */
+    public static class DeviceJsonMatcher extends TypeSafeMatcher<JsonObject> {
+        private final Device device;
+        private String reason = "";
+
+        public DeviceJsonMatcher(Device deviceValue) {
+            device = deviceValue;
+        }
+
+        @Override
+        public boolean matchesSafely(JsonObject jsonDevice) {
+            // check id
+            String jsonId = jsonDevice.get("id").asString();
+            if (!jsonId.equals(device.id().toString())) {
+                reason = "id " + device.id().toString();
+                return false;
+            }
+
+            // check type
+            String jsonType = jsonDevice.get("type").asString();
+            if (!jsonType.equals(device.type().toString())) {
+                reason = "appId " + device.type().toString();
+                return false;
+            }
+
+            // check manufacturer
+            String jsonManufacturer = jsonDevice.get("mfr").asString();
+            if (!jsonManufacturer.equals(device.manufacturer())) {
+                reason = "manufacturer " + device.manufacturer();
+                return false;
+            }
+
+            // check HW version field
+            String jsonHwVersion = jsonDevice.get("hw").asString();
+            if (!jsonHwVersion.equals(device.hwVersion())) {
+                reason = "hw Version " + device.hwVersion();
+                return false;
+            }
+
+            // check SW version field
+            String jsonSwVersion = jsonDevice.get("sw").asString();
+            if (!jsonSwVersion.equals(device.swVersion())) {
+                reason = "sw Version " + device.swVersion();
+                return false;
+            }
+
+            // check serial number field
+            String jsonSerialNumber = jsonDevice.get("serial").asString();
+            if (!jsonSerialNumber.equals(device.serialNumber())) {
+                reason = "serial number " + device.serialNumber();
+                return false;
+            }
+
+            // check chassis id field
+            String jsonChassisId = jsonDevice.get("chassisId").asString();
+            if (!jsonChassisId.equals(device.chassisId().toString())) {
+                reason = "Chassis id " + device.chassisId().toString();
+                return false;
+            }
+
+            return true;
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    /**
+     * Factory to allocate an device matcher.
+     *
+     * @param device device object we are looking for
+     * @return matcher
+     */
+    private static DeviceJsonMatcher matchesDevice(Device device) {
+        return new DeviceJsonMatcher(device);
+    }
+
+    /**
+     * Hamcrest matcher to check that an device is represented properly in a JSON
+     * array of devices.
+     */
+    private static class DeviceJsonArrayMatcher extends TypeSafeMatcher<JsonArray> {
+        private final Device device;
+        private String reason = "";
+
+        public DeviceJsonArrayMatcher(Device deviceValue) {
+            device = deviceValue;
+        }
+
+        @Override
+        public boolean matchesSafely(JsonArray json) {
+            final int minExpectedAttributes = 9;
+            final int maxExpectedAttributes = 10;
+
+            boolean deviceFound = false;
+
+            for (int jsonDeviceIndex = 0; jsonDeviceIndex < json.size();
+                 jsonDeviceIndex++) {
+
+                JsonObject jsonDevice = json.get(jsonDeviceIndex).asObject();
+
+                if (jsonDevice.names().size() < minExpectedAttributes ||
+                    jsonDevice.names().size() > maxExpectedAttributes) {
+                    reason = "Found a device with the wrong number of attributes";
+                    return false;
+                }
+
+                String jsonDeviceId = jsonDevice.get("id").asString();
+                if (jsonDeviceId.equals(device.id().toString())) {
+                    deviceFound = true;
+
+                    //  We found the correct device, check attribute values
+                    assertThat(jsonDevice, matchesDevice(device));
+                }
+            }
+            if (!deviceFound) {
+                reason = "Device with id " + device.id().toString() + " not found";
+                return false;
+            } else {
+                return true;
+            }
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    /**
+     * Factory to allocate an device array matcher.
+     *
+     * @param device device object we are looking for
+     * @return matcher
+     */
+    private static DeviceJsonArrayMatcher hasDevice(Device device) {
+        return new DeviceJsonArrayMatcher(device);
+    }
+
+    @Before
+    public void setUp() {
+        mockDeviceService = createMock(DeviceService.class);
+
+        expect(mockDeviceService.isAvailable(isA(DeviceId.class)))
+                .andReturn(true)
+                .anyTimes();
+        expect(mockDeviceService.getRole(isA(DeviceId.class)))
+                .andReturn(MastershipRole.MASTER)
+                .anyTimes();
+
+        // Register the services needed for the test
+        CodecManager codecService =  new CodecManager();
+        codecService.activate();
+        ServiceDirectory testDirectory =
+                new TestServiceDirectory()
+                        .add(DeviceService.class, mockDeviceService)
+                        .add(CodecService.class, codecService);
+
+        BaseResource.setServiceDirectory(testDirectory);
+
+
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        super.tearDown();
+        verify(mockDeviceService);
+    }
+
+    /**
+     * Tests the result of the rest api GET when there are no devices.
+     */
+    @Test
+    public void testDevicesEmptyArray() {
+        expect(mockDeviceService.getDevices()).andReturn(ImmutableList.of());
+        replay(mockDeviceService);
+
+        WebResource rs = resource();
+        String response = rs.path("devices").get(String.class);
+        assertThat(response, is("{\"devices\":[]}"));
+    }
+
+    /**
+     * Tests the result of the rest api GET when there are devices present.
+     */
+    @Test
+    public void testDevices() {
+        Device device1 = device("dev1");
+        Device device2 = device("dev2");
+        Device device3 = device("dev3");
+
+        expect(mockDeviceService.getDevices())
+                .andReturn(ImmutableList.of(device1, device2, device3))
+                .anyTimes();
+
+        replay(mockDeviceService);
+
+        WebResource rs = resource();
+        String response = rs.path("devices").get(String.class);
+        assertThat(response, containsString("{\"devices\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("devices"));
+
+        JsonArray jsonDevices = result.get("devices").asArray();
+        assertThat(jsonDevices, notNullValue());
+        assertThat(jsonDevices.size(), is(3));
+
+        assertThat(jsonDevices, hasDevice(device1));
+        assertThat(jsonDevices, hasDevice(device2));
+        assertThat(jsonDevices, hasDevice(device3));
+    }
+
+    /**
+     * Tests the result of a rest api GET for a single device.
+     */
+    @Test
+    public void testDevicesSingle() {
+
+        String deviceIdString = "testdevice";
+        DeviceId deviceId = did(deviceIdString);
+        Device device = device(deviceIdString);
+
+        expect(mockDeviceService.getDevice(deviceId))
+                .andReturn(device)
+                .once();
+        replay(mockDeviceService);
+
+        WebResource rs = resource();
+        String response = rs.path("devices/" + deviceId).get(String.class);
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, matchesDevice(device));
+    }
+
+    /**
+     * Tests the result of a rest api GET for the ports of a single device.
+     */
+    @Test
+    public void testDeviceAndPorts() {
+
+        String deviceIdString = "testdevice";
+        DeviceId deviceId = did(deviceIdString);
+        Device device = device(deviceIdString);
+
+        Port port1 = new DefaultPort(device, portNumber(1), true);
+        Port port2 = new DefaultPort(device, portNumber(2), true);
+        Port port3 = new DefaultPort(device, portNumber(3), true);
+        List<Port> ports = ImmutableList.of(port1, port2, port3);
+
+        expect(mockDeviceService.getDevice(deviceId))
+                .andReturn(device)
+                .once();
+
+        expect(mockDeviceService.getPorts(deviceId))
+                .andReturn(ports)
+                .once();
+        replay(mockDeviceService);
+
+        WebResource rs = resource();
+        String response =
+                rs.path("devices/" + deviceId + "/ports")
+                    .get(String.class);
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, matchesDevice(device));
+
+        JsonArray jsonPorts = result.get("ports").asArray();
+        assertThat(jsonPorts.size(), is(3));
+        for (int portIndex = 0; portIndex < jsonPorts.size(); portIndex++) {
+            JsonObject jsonPort = jsonPorts.get(portIndex).asObject();
+
+            assertThat(jsonPort.size(), is(4));
+            assertThat(jsonPort.get("port").asString(),
+                       is(Integer.toString(portIndex + 1)));
+            assertThat(jsonPort.get("isEnabled").asBoolean(),
+                       is(true));
+            assertThat(jsonPort.get("type").asString(),
+                       equalTo("copper"));
+            assertThat(jsonPort.get("portSpeed").asLong(),
+                    is(1000L));
+        }
+    }
+
+    /**
+     * Tests that a fetch of a non-existent device object throws an exception.
+     */
+    @Test
+    public void testBadGet() {
+
+        expect(mockDeviceService.getDevice(isA(DeviceId.class)))
+                .andReturn(null)
+                .anyTimes();
+        replay(mockDeviceService);
+
+        WebResource rs = resource();
+        try {
+            rs.path("devices/0").get(String.class);
+            fail("Fetch of non-existent device did not throw an exception");
+        } catch (UniformInterfaceException ex) {
+            assertThat(ex.getMessage(),
+                    containsString("returned a response status of"));
+        }
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.rest;
+
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeMatcher;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.osgi.ServiceDirectory;
+import org.onlab.osgi.TestServiceDirectory;
+import org.onlab.rest.BaseResource;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.impl.CodecManager;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.link.LinkService;
+
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.test.framework.JerseyTest;
+
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.isA;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.net.NetTestTools.link;
+
+/**
+ * Unit tests for links REST APIs.
+ */
+public class LinksResourceTest extends JerseyTest {
+    LinkService mockLinkService;
+
+    Link link1 = link("src1", 1, "dst1", 1);
+    Link link2 = link("src2", 2, "dst2", 2);
+    Link link3 = link("src3", 3, "dst3", 3);
+
+    /**
+     * Constructs the test.
+     */
+    public LinksResourceTest() {
+        super("org.onosproject.rest");
+    }
+
+    /**
+     * Hamcrest matcher to check that an link representation in JSON matches
+     * the actual link.
+     */
+    public static class LinkJsonMatcher extends TypeSafeMatcher<JsonObject> {
+        private final Link link;
+        private String reason = "";
+
+        public LinkJsonMatcher(Link linkValue) {
+            link = linkValue;
+        }
+
+        @Override
+        public boolean matchesSafely(JsonObject jsonLink) {
+            JsonObject jsonSrc = jsonLink.get("src").asObject();
+            String jsonSrcDevice = jsonSrc.get("device").asString();
+            String jsonSrcPort = jsonSrc.get("port").asString();
+
+            JsonObject jsonDst = jsonLink.get("dst").asObject();
+            String jsonDstDevice = jsonDst.get("device").asString();
+            String jsonDstPort = jsonDst.get("port").asString();
+
+            return jsonSrcDevice.equals(link.src().deviceId().toString()) &&
+                   jsonSrcPort.equals(link.src().port().toString()) &&
+                   jsonDstDevice.equals(link.dst().deviceId().toString()) &&
+                   jsonDstPort.equals(link.dst().port().toString());
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    /**
+     * Factory to allocate an link matcher.
+     *
+     * @param link link object we are looking for
+     * @return matcher
+     */
+    private static LinkJsonMatcher matchesLink(Link link) {
+        return new LinkJsonMatcher(link);
+    }
+
+    /**
+     * Hamcrest matcher to check that an link is represented properly in a JSON
+     * array of links.
+     */
+    private static class LinkJsonArrayMatcher extends TypeSafeMatcher<JsonArray> {
+        private final Link link;
+        private String reason = "";
+
+        public LinkJsonArrayMatcher(Link linkValue) {
+            link = linkValue;
+        }
+
+        @Override
+        public boolean matchesSafely(JsonArray json) {
+            final int expectedAttributes = 2;
+
+            for (int jsonLinkIndex = 0; jsonLinkIndex < json.size();
+                 jsonLinkIndex++) {
+
+                JsonObject jsonLink = json.get(jsonLinkIndex).asObject();
+
+                if (jsonLink.names().size() != expectedAttributes) {
+                    reason = "Found a link with the wrong number of attributes";
+                    return false;
+                }
+
+                if (matchesLink(link).matchesSafely(jsonLink)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    /**
+     * Factory to allocate an link array matcher.
+     *
+     * @param link link object we are looking for
+     * @return matcher
+     */
+    private static LinkJsonArrayMatcher hasLink(Link link) {
+        return new LinkJsonArrayMatcher(link);
+    }
+
+
+    @Before
+    public void setUp() {
+        mockLinkService = createMock(LinkService.class);
+
+        // Register the services needed for the test
+        CodecManager codecService =  new CodecManager();
+        codecService.activate();
+        ServiceDirectory testDirectory =
+                new TestServiceDirectory()
+                        .add(LinkService.class, mockLinkService)
+                        .add(CodecService.class, codecService);
+
+        BaseResource.setServiceDirectory(testDirectory);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        super.tearDown();
+        verify(mockLinkService);
+    }
+
+    /**
+     * Tests the result of the rest api GET when there are no links.
+     */
+    @Test
+    public void testLinksEmptyArray() {
+        expect(mockLinkService.getLinks()).andReturn(ImmutableList.of());
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs.path("links").get(String.class);
+        assertThat(response, is("{\"links\":[]}"));
+    }
+
+    /**
+     * Tests the result of the rest api GET when there are links present.
+     */
+    @Test
+    public void testLinks() {
+        expect(mockLinkService.getLinks())
+                .andReturn(ImmutableList.of(link1, link2, link3))
+                .anyTimes();
+
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs.path("links").get(String.class);
+        assertThat(response, containsString("{\"links\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("links"));
+
+        JsonArray jsonLinks = result.get("links").asArray();
+        assertThat(jsonLinks, notNullValue());
+        assertThat(jsonLinks.size(), is(3));
+
+        assertThat(jsonLinks, hasLink(link1));
+        assertThat(jsonLinks, hasLink(link2));
+        assertThat(jsonLinks, hasLink(link3));
+    }
+
+    /**
+     * Tests the result of the rest api GET of links for a specific device.
+     */
+    @Test
+    public void testLinksByDevice() {
+        expect(mockLinkService.getDeviceLinks(isA(DeviceId.class)))
+                .andReturn(ImmutableSet.of(link2))
+                .anyTimes();
+
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs
+                .path("links")
+                .queryParam("device", "src2")
+                .get(String.class);
+        assertThat(response, containsString("{\"links\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("links"));
+
+        JsonArray jsonLinks = result.get("links").asArray();
+        assertThat(jsonLinks, notNullValue());
+        assertThat(jsonLinks.size(), is(1));
+
+        assertThat(jsonLinks, hasLink(link2));
+    }
+
+    /**
+     * Tests the result of the rest api GET of links for a specific device
+     * and port.
+     */
+    @Test
+    public void testLinksByDevicePort() {
+
+        expect(mockLinkService.getLinks(isA(ConnectPoint.class)))
+                .andReturn(ImmutableSet.of(link2))
+                .anyTimes();
+
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs
+                .path("links")
+                .queryParam("device", "src2")
+                .queryParam("port", "2")
+                .get(String.class);
+        assertThat(response, containsString("{\"links\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("links"));
+
+        JsonArray jsonLinks = result.get("links").asArray();
+        assertThat(jsonLinks, notNullValue());
+        assertThat(jsonLinks.size(), is(1));
+
+        assertThat(jsonLinks, hasLink(link2));
+    }
+
+    /**
+     * Tests the result of the rest api GET of links for a specific
+     * device, port, and direction.
+     */
+    @Test
+    public void testLinksByDevicePortDirection() {
+
+        expect(mockLinkService.getIngressLinks(isA(ConnectPoint.class)))
+                .andReturn(ImmutableSet.of(link2))
+                .anyTimes();
+
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs
+                .path("links")
+                .queryParam("device", "src2")
+                .queryParam("port", "2")
+                .queryParam("direction", "INGRESS")
+                .get(String.class);
+        assertThat(response, containsString("{\"links\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("links"));
+
+        JsonArray jsonLinks = result.get("links").asArray();
+        assertThat(jsonLinks, notNullValue());
+        assertThat(jsonLinks.size(), is(1));
+
+        assertThat(jsonLinks, hasLink(link2));
+    }
+
+    /**
+     * Tests the result of the rest api GET of links for a specific
+     * device and direction.
+     */
+    @Test
+    public void testLinksByDeviceDirection() {
+
+        expect(mockLinkService.getDeviceIngressLinks(isA(DeviceId.class)))
+                .andReturn(ImmutableSet.of(link2))
+                .anyTimes();
+
+        replay(mockLinkService);
+
+        WebResource rs = resource();
+        String response = rs
+                .path("links")
+                .queryParam("device", "src2")
+                .queryParam("direction", "INGRESS")
+                .get(String.class);
+        assertThat(response, containsString("{\"links\":["));
+
+        JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("links"));
+
+        JsonArray jsonLinks = result.get("links").asArray();
+        assertThat(jsonLinks, notNullValue());
+        assertThat(jsonLinks.size(), is(1));
+
+        assertThat(jsonLinks, hasLink(link2));
+    }
+}