[CORD-1628] DHCP relay app configuration change for multiple servers

Change-Id: I13747d8e6451658dfd9344c428b6aad11bf5af62
diff --git a/apps/dhcprelay/src/test/java/org/onosproject/dhcprelay/config/DhcpRelayConfigTest.java b/apps/dhcprelay/src/test/java/org/onosproject/dhcprelay/config/DhcpRelayConfigTest.java
new file mode 100644
index 0000000..4160e06
--- /dev/null
+++ b/apps/dhcprelay/src/test/java/org/onosproject/dhcprelay/config/DhcpRelayConfigTest.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2017-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.dhcprelay.config;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.io.Resources;
+import org.junit.Test;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.Ip6Address;
+import org.onosproject.TestApplicationId;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+
+
+import java.io.IOException;
+
+import static org.junit.Assert.*;
+import static org.onosproject.dhcprelay.DhcpRelayManager.DHCP_RELAY_APP;
+
+/**
+ * Tests for DHCP relay app configuration.
+ */
+public class DhcpRelayConfigTest {
+    private static final String CONFIG_FILE_PATH = "dhcp-relay.json";
+    private static final String INVALID_CONFIG_FILE_PATH = "invalid-dhcp-relay.json";
+    private static final ApplicationId APP_ID = new TestApplicationId("DhcpRelayTest");
+    private static final ConnectPoint DEFAULT_CONNECT_POINT = ConnectPoint.deviceConnectPoint("of:0000000000000002/2");
+    private static final Ip4Address DEFAULT_SERVER_IP = Ip4Address.valueOf("172.168.10.2");
+    private static final Ip4Address DEFAULT_GATEWAY_IP = Ip4Address.valueOf("192.168.10.254");
+    private static final Ip6Address DEFAULT_SERVER_IP_V6 = Ip6Address.valueOf("2000::200:1");
+    private static final Ip6Address DEFAULT_GATEWAY_IP_V6 = Ip6Address.valueOf("1000::100:1");
+
+    private static final ConnectPoint INDIRECT_CONNECT_POINT = ConnectPoint.deviceConnectPoint("of:0000000000000002/3");
+    private static final Ip4Address INDIRECT_SERVER_IP = Ip4Address.valueOf("172.168.10.3");
+
+    @Test
+    public void testDefaultConfig() throws IOException {
+        ObjectMapper om = new ObjectMapper();
+        JsonNode json = om.readTree(Resources.getResource(CONFIG_FILE_PATH));
+        DefaultDhcpRelayConfig config = new DefaultDhcpRelayConfig();
+        json = json.path("apps").path(DHCP_RELAY_APP).path(DefaultDhcpRelayConfig.KEY);
+        config.init(APP_ID, DefaultDhcpRelayConfig.KEY, json, om, null);
+
+        assertEquals(1, config.dhcpServerConfigs().size());
+        DhcpServerConfig serverConfig = config.dhcpServerConfigs().get(0);
+        assertEquals(DEFAULT_CONNECT_POINT, serverConfig.getDhcpServerConnectPoint().orElse(null));
+        assertEquals(DEFAULT_SERVER_IP, serverConfig.getDhcpServerIp4().orElse(null));
+        assertEquals(DEFAULT_GATEWAY_IP, serverConfig.getDhcpGatewayIp4().orElse(null));
+        assertEquals(DEFAULT_SERVER_IP_V6, serverConfig.getDhcpServerIp6().orElse(null));
+        assertEquals(DEFAULT_GATEWAY_IP_V6, serverConfig.getDhcpGatewayIp6().orElse(null));
+    }
+
+    @Test
+    public void testIndirectConfig() throws IOException {
+        ObjectMapper om = new ObjectMapper();
+        JsonNode json = om.readTree(Resources.getResource(CONFIG_FILE_PATH));
+        IndirectDhcpRelayConfig config = new IndirectDhcpRelayConfig();
+        json = json.path("apps").path(DHCP_RELAY_APP).path(IndirectDhcpRelayConfig.KEY);
+        config.init(APP_ID, IndirectDhcpRelayConfig.KEY, json, om, null);
+
+        assertEquals(1, config.dhcpServerConfigs().size());
+        DhcpServerConfig serverConfig = config.dhcpServerConfigs().get(0);
+        assertEquals(INDIRECT_CONNECT_POINT, serverConfig.getDhcpServerConnectPoint().orElse(null));
+        assertEquals(INDIRECT_SERVER_IP, serverConfig.getDhcpServerIp4().orElse(null));
+        assertNull(serverConfig.getDhcpGatewayIp4().orElse(null));
+        assertNull(serverConfig.getDhcpServerIp6().orElse(null));
+        assertNull(serverConfig.getDhcpGatewayIp6().orElse(null));
+    }
+
+    @Test
+    public void testInvalidConfig() throws IOException {
+        ObjectMapper om = new ObjectMapper();
+        JsonNode json = om.readTree(Resources.getResource(INVALID_CONFIG_FILE_PATH));
+        DefaultDhcpRelayConfig config = new DefaultDhcpRelayConfig();
+        json = json.path("apps").path(DHCP_RELAY_APP).path(DefaultDhcpRelayConfig.KEY);
+        config.init(APP_ID, DefaultDhcpRelayConfig.KEY, json, om, null);
+        assertFalse(config.isValid());
+    }
+}