Implement kubevirt loadbalancer service with unit tests

Change-Id: I1c29e75aa5196b497f8f12f1d182788e3d173244
(cherry picked from commit 870abf8c7a7904c5953e20807ee7c681d8b5cd0b)
diff --git a/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtLoadBalancerRuleJsonMatcher.java b/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtLoadBalancerRuleJsonMatcher.java
new file mode 100644
index 0000000..404d1ee
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/test/java/org/onosproject/kubevirtnetworking/codec/KubevirtLoadBalancerRuleJsonMatcher.java
@@ -0,0 +1,89 @@
+/*
+ * 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.KubevirtLoadBalancerRule;
+
+/**
+ * Hamcrest matcher for kubevirt load balancer.
+ */
+public final class KubevirtLoadBalancerRuleJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final KubevirtLoadBalancerRule rule;
+
+    private static final String PROTOCOL = "protocol";
+    private static final String PORT_RANGE_MAX = "portRangeMax";
+    private static final String PORT_RANGE_MIN = "portRangeMin";
+
+    private KubevirtLoadBalancerRuleJsonMatcher(KubevirtLoadBalancerRule rule) {
+        this.rule = rule;
+    }
+
+    @Override
+    protected boolean matchesSafely(JsonNode jsonNode, Description description) {
+        // check protocol
+        JsonNode jsonProtocol = jsonNode.get(PROTOCOL);
+        if (jsonProtocol != null) {
+            String protocol = rule.protocol();
+            if (!jsonProtocol.asText().equals(protocol)) {
+                description.appendText("Protocol was " + jsonProtocol);
+                return false;
+            }
+        }
+
+        // check port range max
+        JsonNode jsonPortRangeMax = jsonNode.get(PORT_RANGE_MAX);
+        if (jsonPortRangeMax != null) {
+            int portRangeMax = rule.portRangeMax();
+            if (portRangeMax != jsonPortRangeMax.asInt()) {
+                description.appendText("PortRangeMax was " + jsonPortRangeMax);
+                return false;
+            }
+        }
+
+        // check port range min
+        JsonNode jsonPortRangeMin = jsonNode.get(PORT_RANGE_MIN);
+        if (jsonPortRangeMin != null) {
+            int portRangeMin = rule.portRangeMin();
+            if (portRangeMin != jsonPortRangeMin.asInt()) {
+                description.appendText("PortRangeMin was " + jsonPortRangeMin);
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(rule.toString());
+    }
+
+    /**
+     * Factory to allocate an kubevirt load balancer rule matcher.
+     *
+     * @param rule kubevirt load balancer rule object we are looking for
+     * @return matcher
+     */
+    public static KubevirtLoadBalancerRuleJsonMatcher
+        matchesKubevirtLoadBalancerRule(KubevirtLoadBalancerRule rule) {
+        return new KubevirtLoadBalancerRuleJsonMatcher(rule);
+    }
+}