Add support for COPY.

Closes #2040
Original pull request: #2059.

src/test/java/org/springframework/data/redis/connection/DefaultStringRedisConnectionPipelineTests.java

@@ -138,6 +138,12 @@ public class DefaultStringRedisConnectionPipelineTests extends DefaultStringRedi
 		super.testDel();
 	}
 
+	@Test
+	public void testCopy() {
+		doReturn(Collections.singletonList(Boolean.TRUE)).when(nativeConnection).closePipeline();
+		super.testCopy();
+	}
+
 	@Test
 	public void testEchoBytes() {
 		doReturn(Arrays.asList(new Object[] { barBytes })).when(nativeConnection).closePipeline();

src/test/java/org/springframework/data/redis/connection/DefaultStringRedisConnectionPipelineTxTests.java

@@ -142,6 +142,13 @@ public class DefaultStringRedisConnectionPipelineTxTests extends DefaultStringRe
 		super.testDel();
 	}
 
+	@Test
+	public void testCopy() {
+		doReturn(Collections.singletonList(Collections.singletonList(Boolean.TRUE))).when(nativeConnection).closePipeline();
+		super.testCopy();
+	}
+
+
 	@Test
 	public void testEchoBytes() {
 		doReturn(Collections.singletonList(Arrays.asList(new Object[] { barBytes }))).when(nativeConnection)

src/test/java/org/springframework/data/redis/connection/DefaultStringRedisConnectionTests.java

@@ -71,6 +71,7 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
  * @author Ninad Divadkar
  * @author Mark Paluch
  * @author dengliming
+ * @author ihaohong
  */
 @ExtendWith(MockitoExtension.class)
 @MockitoSettings(strictness = Strictness.LENIENT)
@@ -235,6 +236,13 @@ public class DefaultStringRedisConnectionTests {
 		verifyResults(Collections.singletonList(1L));
 	}
 
+	@Test
+	public void testCopy() {
+		doReturn(Boolean.TRUE).when(nativeConnection).copy(fooBytes, barBytes);
+		actual.add(connection.copy(foo, bar));
+		verifyResults(Collections.singletonList(Boolean.TRUE));
+	}
+
 	@Test
 	public void testEchoBytes() {
 		doReturn(barBytes).when(nativeConnection).echo(fooBytes);

src/test/java/org/springframework/data/redis/connection/RedisConnectionUnitTests.java

@@ -187,6 +187,10 @@ class RedisConnectionUnitTests {
 			return delegate.del(keys);
 		}
 
+		public Boolean copy(byte[] sourceKey, byte[] targetKey) {
+			return delegate.copy(sourceKey, targetKey);
+		}
+
 		public void close() throws DataAccessException {
 			super.close();
 		}

src/test/java/org/springframework/data/redis/core/RedisTemplateIntegrationTests.java

@@ -58,6 +58,7 @@ import org.springframework.data.redis.test.util.CollectionAwareComparator;
  * @author Anqing Shao
  * @author Duobiao Ou
  * @author Mark Paluch
+ * @author ihaohong
  */
 @MethodSource("testParams")
 public class RedisTemplateIntegrationTests<K, V> {
@@ -390,6 +391,20 @@ public class RedisTemplateIntegrationTests<K, V> {
 		assertThat(redisTemplate.hasKey(key1)).isFalse();
 	}
 
+	@ParameterizedRedisTest
+	void testCopy() {
+		K key1 = keyFactory.instance();
+		K key2 = keyFactory.instance();
+		V value1 = valueFactory.instance();
+
+		redisTemplate.opsForValue().set(key1, value1);
+
+		assertThat(redisTemplate.hasKey(key2)).isFalse();
+		redisTemplate.copy(key1, key2);
+		assertThat(redisTemplate.hasKey(key2)).isTrue();
+		assertThat(redisTemplate.opsForValue().get(key2)).isEqualTo(value1);
+	}
+
 	@ParameterizedRedisTest // DATAREDIS-688
 	void testDeleteMultiple() {