Add a set of codecs for kubevirt network with unit test cases

Change-Id: I0734a085258236f524d0d251ab71056eb5602dc4
diff --git a/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtHostRouteJsonMatcher.java b/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtHostRouteJsonMatcher.java
new file mode 100644
index 0000000..4603980
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtHostRouteJsonMatcher.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2021-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.kubevirtnetworking.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.kubevirtnetworking.api.KubevirtHostRoute;
+
+/**
+ * Hamcrest matcher for kubevirt host route interface.
+ */
+public final class KubevirtHostRouteJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final KubevirtHostRoute hostRoute;
+
+    private static final String DESTINATION = "destination";
+    private static final String NEXTHOP = "nexthop";
+
+    private KubevirtHostRouteJsonMatcher(KubevirtHostRoute hostRoute) {
+        this.hostRoute = hostRoute;
+    }
+
+    @Override
+    protected boolean matchesSafely(JsonNode jsonNode, Description description) {
+        // check destination
+        String jsonDestination = jsonNode.get(DESTINATION).asText();
+        String destination = hostRoute.destination().toString();
+        if (!jsonDestination.equals(destination)) {
+            description.appendText("destination was " + jsonDestination);
+            return false;
+        }
+
+        // check nexthop
+        JsonNode jsonNexthop = jsonNode.get(NEXTHOP);
+        if (jsonNexthop != null) {
+            String nexthop = hostRoute.nexthop().toString();
+            if (!jsonNexthop.asText().equals(nexthop)) {
+                description.appendText("nexthop was " + jsonNexthop);
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(description.toString());
+    }
+
+    /**
+     * Factory to allocate an kubevirt host route matcher.
+     *
+     * @param route kubevirt host route object we are looking for
+     * @return matcher
+     */
+    public static KubevirtHostRouteJsonMatcher matchesKubevirtHostRoute(KubevirtHostRoute route) {
+        return new KubevirtHostRouteJsonMatcher(route);
+    }
+}