Expose PolicyService through API package

Change-Id: I2166e14a0dd256b3f8ab680c8f2ad59cce8a3678
diff --git a/impl/src/test/java/org/onosproject/segmentrouting/policy/impl/RedirectPolicyCodecTest.java b/impl/src/test/java/org/onosproject/segmentrouting/policy/impl/RedirectPolicyCodecTest.java
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+/*
+ * 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.segmentrouting.policy.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import junit.framework.TestCase;
+import org.junit.Before;
+import org.junit.Test;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.codec.impl.MockCodecContext;
+import org.onosproject.net.DeviceId;
+import org.onosproject.segmentrouting.policy.api.RedirectPolicy;
+
+import java.io.InputStream;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+
+public class RedirectPolicyCodecTest extends TestCase {
+    private RedirectPolicy redirectPolicy;
+
+    private CodecContext context;
+    private JsonCodec<RedirectPolicy> codec;
+
+    @Before
+    public void setUp() throws Exception {
+        context = new MockCodecContext();
+        codec = new RedirectPolicyCodec();
+
+        List<DeviceId> deviceIds = new LinkedList<>();
+        deviceIds.add(DeviceId.deviceId("of:0000000000000001"));
+        deviceIds.add(DeviceId.deviceId("of:0000000000000002"));
+        deviceIds.add(DeviceId.deviceId("of:0000000000000003"));
+        redirectPolicy = new RedirectPolicy(Set.copyOf(deviceIds));
+    }
+
+    @Test
+    public void testEncode() throws Exception {
+        ObjectMapper mapper = new ObjectMapper();
+
+        InputStream jsonStream1 = RedirectPolicyCodecTest.class.getResourceAsStream("/redirectpolicy.json");
+        JsonNode expected = mapper.readTree(jsonStream1);
+
+        JsonNode actual = codec.encode(redirectPolicy, context);
+
+        assertEquals(expected.get(RedirectPolicyCodec.POLICY_ID), actual.get(RedirectPolicyCodec.POLICY_ID));
+        assertEquals(expected.get(RedirectPolicyCodec.POLICY_TYPE), actual.get(RedirectPolicyCodec.POLICY_TYPE));
+        assertEquals(expected.get(RedirectPolicyCodec.DEVICE_ID), actual.get(RedirectPolicyCodec.DEVICE_ID));
+    }
+
+    @Test
+    public void testDecode() throws Exception {
+        ObjectMapper mapper = new ObjectMapper();
+
+        InputStream jsonStream1 = RedirectPolicyCodecTest.class.getResourceAsStream("/redirectpolicy.json");
+        ObjectNode json = mapper.readTree(jsonStream1).deepCopy();
+
+        RedirectPolicy actual = codec.decode(json, context);
+
+        assertEquals(redirectPolicy, actual);
+    }
+}
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