Initial support for multi kubernetes clusters for k8s nodes

Change-Id: I6ca132898f8e157e0583de38a637fdc135f21d6f
diff --git a/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/ExternalNetworkManagerTest.java b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/ExternalNetworkManagerTest.java
new file mode 100644
index 0000000..f236491
--- /dev/null
+++ b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/impl/ExternalNetworkManagerTest.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2020-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.k8snode.impl;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.IpPrefix;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreServiceAdapter;
+import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.store.service.TestStorageService;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Unit tests for external network manager.
+ */
+public class ExternalNetworkManagerTest {
+
+    private static final ApplicationId TEST_APP_ID = new DefaultApplicationId(1, "test");
+
+    private ExternalNetworkManager target;
+
+    /**
+     * Initial setup for this unit test.
+     */
+    @Before
+    public void setUp() {
+        target = new ExternalNetworkManager();
+
+        target.coreService = new TestCoreService();
+        target.storageService = new TestStorageService();
+        target.activate();
+    }
+
+    /**
+     * Clean up unit test.
+     */
+    @After
+    public void tearDown() {
+        target.deactivate();
+        target = null;
+    }
+
+    /**
+     * Checks if creating and removing a config work well with proper events.
+     */
+    @Test
+    public void testObtainGatewayIp() {
+        IpPrefix cidr = IpPrefix.valueOf("192.168.200.0/24");
+        target.registerNetwork(cidr);
+
+        assertEquals(target.getGatewayIp(cidr), IpAddress.valueOf("192.168.200.1"));
+    }
+
+    @Test
+    public void testAllocateReleaseIp() {
+        IpPrefix cidr = IpPrefix.valueOf("192.168.200.0/24");
+        target.registerNetwork(cidr);
+        IpAddress ip = target.allocateIp(cidr);
+        assertEquals(251, target.getAllIps(cidr).size());
+
+        target.releaseIp(cidr, ip);
+        assertEquals(252, target.getAllIps(cidr).size());
+    }
+
+    private static class TestCoreService extends CoreServiceAdapter {
+        @Override
+        public ApplicationId registerApplication(String name) {
+            return TEST_APP_ID;
+        }
+    }
+}