[ONOS-7905] Add default implementation for kubernetes data model

Change-Id: I08e9266dec2050e8299e4189745608a6e03fd06e
diff --git a/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkCodecTest.java b/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkCodecTest.java
new file mode 100644
index 0000000..9d7fd99
--- /dev/null
+++ b/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkCodecTest.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.k8snetworking.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.hamcrest.MatcherAssert;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.IpAddress;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.codec.impl.CodecManager;
+import org.onosproject.core.CoreService;
+import org.onosproject.k8snetworking.api.DefaultK8sNetwork;
+import org.onosproject.k8snetworking.api.K8sNetwork;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+import static junit.framework.TestCase.assertEquals;
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.replay;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onosproject.k8snetworking.codec.K8sNetworkJsonMatcher.matchesK8sNetwork;
+import static org.onosproject.net.NetTestTools.APP_ID;
+
+/**
+ * Unit tests for kubernetes network codec.
+ */
+public class K8sNetworkCodecTest {
+
+    MockCodecContext context;
+
+    JsonCodec<K8sNetwork> k8sNetworkCodec;
+
+    final CoreService mockCoreService = createMock(CoreService.class);
+    private static final String REST_APP_ID = "org.onosproject.rest";
+
+    /**
+     * Initial setup for this unit test.
+     */
+    @Before
+    public void setUp() {
+        context = new MockCodecContext();
+        k8sNetworkCodec = new K8sNetworkCodec();
+
+        assertThat(k8sNetworkCodec, notNullValue());
+
+        expect(mockCoreService.registerApplication(REST_APP_ID))
+                .andReturn(APP_ID).anyTimes();
+        replay(mockCoreService);
+        context.registerService(CoreService.class, mockCoreService);
+    }
+
+    /**
+     * Tests the kubernetes network encoding.
+     */
+    @Test
+    public void testK8sNetworkEncode() {
+        K8sNetwork network = DefaultK8sNetwork.builder()
+                .networkId("network-1")
+                .segmentId("1")
+                .type(K8sNetwork.Type.VXLAN)
+                .gatewayIp(IpAddress.valueOf("10.10.10.1"))
+                .cidr("32")
+                .mtu(1500)
+                .build();
+
+        ObjectNode nodeJson = k8sNetworkCodec.encode(network, context);
+        assertThat(nodeJson, matchesK8sNetwork(network));
+    }
+
+    /**
+     * Tests the kubernetes network decoding.
+     */
+    @Test
+    public void testK8sNetworkDecode() throws IOException {
+        K8sNetwork network = getK8sNetwork("K8sNetwork.json");
+
+        assertEquals("network-1", network.networkId());
+        assertEquals("1", network.segmentId());
+        assertEquals("VXLAN", network.type().name());
+        assertEquals("10.10.10.1", network.gatewayIp().toString());
+        assertEquals("32", network.cidr());
+        assertThat(network.mtu(), is(1500));
+    }
+
+    /**
+     * Reads in an kubernetes network from the given resource and decodes it.
+     *
+     * @param resourceName resource to use to read the JSON for the rule
+     * @return decoded kubernetes network
+     * @throws IOException if processing the resource fails
+     */
+    private K8sNetwork getK8sNetwork(String resourceName) throws IOException {
+        InputStream jsonStream = K8sNetworkCodecTest.class.getResourceAsStream(resourceName);
+        JsonNode json = context.mapper().readTree(jsonStream);
+        MatcherAssert.assertThat(json, notNullValue());
+        K8sNetwork network = k8sNetworkCodec.decode((ObjectNode) json, context);
+        assertThat(network, notNullValue());
+        return network;
+    }
+
+    private class MockCodecContext implements CodecContext {
+        private final ObjectMapper mapper = new ObjectMapper();
+        private final CodecManager manager = new CodecManager();
+        private final Map<Class<?>, Object> services = new HashMap<>();
+
+        /**
+         * Constructs a new mock codec context.
+         */
+        public MockCodecContext() {
+            manager.activate();
+        }
+
+        @Override
+        public ObjectMapper mapper() {
+            return mapper;
+        }
+
+        @Override
+        @SuppressWarnings("unchecked")
+        public <T> JsonCodec<T> codec(Class<T> entityClass) {
+            if (entityClass == K8sNetwork.class) {
+                return (JsonCodec<T>) k8sNetworkCodec;
+            }
+            return manager.getCodec(entityClass);
+        }
+
+        @SuppressWarnings("unchecked")
+        @Override
+        public <T> T getService(Class<T> serviceClass) {
+            return (T) services.get(serviceClass);
+        }
+
+        // for registering mock services
+        public <T> void registerService(Class<T> serviceClass, T impl) {
+            services.put(serviceClass, impl);
+        }
+    }
+}