DATAREDIS-1085 - Support approximate trimming using XTRIM.

Original pull request: #561.

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

@@ -1726,6 +1726,13 @@ public class DefaultStringRedisConnectionPipelineTests extends DefaultStringRedi
 		super.xTrimShouldDelegateAndConvertCorrectly();
 	}
 
+	@Test
+	public void xTrimApproximateShouldDelegateAndConvertCorrectly() {
+
+		doReturn(Arrays.asList(1L)).when(nativeConnection).closePipeline();
+		super.xTrimApproximateShouldDelegateAndConvertCorrectly();
+	}
+
 	protected List<Object> getResults() {
 		return connection.closePipeline();
 	}

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

@@ -1846,6 +1846,13 @@ public class DefaultStringRedisConnectionPipelineTxTests extends DefaultStringRe
 		super.xTrimShouldDelegateAndConvertCorrectly();
 	}
 
+	@Test
+	public void xTrimApproximateShouldDelegateAndConvertCorrectly() {
+
+		doReturn(Arrays.asList(Arrays.asList(1L))).when(nativeConnection).closePipeline();
+		super.xTrimApproximateShouldDelegateAndConvertCorrectly();
+	}
+
 	@SuppressWarnings("unchecked")
 	protected List<Object> getResults() {
 		connection.exec();

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

@@ -2169,6 +2169,15 @@ public class DefaultStringRedisConnectionTests {
 		Assertions.assertThat(getResults()).containsExactly(1L);
 	}
 
+	@Test
+	public void xTrimApproximateShouldDelegateAndConvertCorrectly() {
+
+		doReturn(1L).when(nativeConnection).xTrim(any(), anyLong(), anyBoolean());
+
+		actual.add(connection.xTrim("key", 2L, true));
+		Assertions.assertThat(getResults()).containsExactly(1L);
+	}
+
 	protected List<Object> getResults() {
 		return actual;
 	}

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

@@ -1733,6 +1733,13 @@ public class DefaultStringRedisConnectionTxTests extends DefaultStringRedisConne
 		super.xTrimShouldDelegateAndConvertCorrectly();
 	}
 
+	@Test
+	public void xTrimApproximateShouldDelegateAndConvertCorrectly() {
+
+		doReturn(Arrays.asList(1L)).when(nativeConnection).exec();
+		super.xTrimApproximateShouldDelegateAndConvertCorrectly();
+	}
+
 	protected List<Object> getResults() {
 		return connection.exec();
 	}