DATAREDIS-372 - Allow easier RedisSentinelConfiguration setup.

We now allow to initialize a RedisSentinelConfiguration based on a given String collection of host:ports.
  sentinelHostAndPorts[0] = 127.0.0.1:23679
  sentinelHostAndPorts[1] = 127.0.0.1:23680

Further on it’s possible to pass in a PropertySource containing master name and sentinel nodes.
  spring.redis.sentinel.master=myMaster
  spring.redis.sentinel.nodes=127.0.0.1:23679,127.0.0.1:23680

Original pull request: #126.

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

@@ -0,0 +1,150 @@
+/*
+ * Copyright 2015 the original author or authors.
+ *
+ * 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.springframework.data.redis.connection;
+
+import static org.hamcrest.core.Is.*;
+import static org.hamcrest.core.IsCollectionContaining.*;
+import static org.hamcrest.core.IsNull.*;
+import static org.junit.Assert.*;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+
+import org.junit.Test;
+import org.springframework.core.env.PropertySource;
+import org.springframework.mock.env.MockPropertySource;
+import org.springframework.util.StringUtils;
+
+/**
+ * @author Christoph Strobl
+ */
+public class RedisSentinelConfigurationUnitTests {
+
+	static final String HOST_AND_PORT_1 = "127.0.0.1:123";
+	static final String HOST_AND_PORT_2 = "localhost:456";
+	static final String HOST_AND_PORT_3 = "localhost:789";
+	static final String HOST_AND_NO_PORT = "localhost";
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldCreateRedisSentinelConfigurationCorrectlyGivenMasterAndSingleHostAndPortString() {
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration("mymaster",
+				Collections.singleton(HOST_AND_PORT_1));
+
+		assertThat(config.getSentinels().size(), is(1));
+		assertThat(config.getSentinels(), hasItems(new RedisNode("127.0.0.1", 123)));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldCreateRedisSentinelConfigurationCorrectlyGivenMasterAndMultipleHostAndPortStrings() {
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration("mymaster", new HashSet<String>(Arrays.asList(
+				HOST_AND_PORT_1, HOST_AND_PORT_2, HOST_AND_PORT_3)));
+
+		assertThat(config.getSentinels().size(), is(3));
+		assertThat(config.getSentinels(),
+				hasItems(new RedisNode("127.0.0.1", 123), new RedisNode("localhost", 456), new RedisNode("localhost", 789)));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void shouldThrowExecptionOnInvalidHostAndPortString() {
+		new RedisSentinelConfiguration("mymaster", Collections.singleton(HOST_AND_NO_PORT));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void shouldThrowExceptionWhenListOfHostAndPortIsNull() {
+		new RedisSentinelConfiguration("mymaster", Collections.<String> singleton(null));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldNotFailWhenListOfHostAndPortIsEmpty() {
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration("mymaster", Collections.<String> emptySet());
+
+		assertThat(config.getSentinels().size(), is(0));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void shouldThrowExceptionGivenNullPropertySource() {
+		new RedisSentinelConfiguration((PropertySource<?>) null);
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldNotFailWhenGivenPropertySourceNotContainingRelevantProperties() {
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration(new MockPropertySource());
+
+		assertThat(config.getMaster(), nullValue());
+		assertThat(config.getSentinels().size(), is(0));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldBeCreatedCorrecltyGivenValidPropertySourceWithMasterAndSingleHostPort() {
+
+		MockPropertySource propertySource = new MockPropertySource();
+		propertySource.setProperty("spring.redis.sentinel.master", "myMaster");
+		propertySource.setProperty("spring.redis.sentinel.nodes", HOST_AND_PORT_1);
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration(propertySource);
+
+		assertThat(config.getMaster().getName(), is("myMaster"));
+		assertThat(config.getSentinels().size(), is(1));
+		assertThat(config.getSentinels(), hasItems(new RedisNode("127.0.0.1", 123)));
+	}
+
+	/**
+	 * @see DATAREDIS-372
+	 */
+	@Test
+	public void shouldBeCreatedCorrecltyGivenValidPropertySourceWithMasterAndMultipleHostPort() {
+
+		MockPropertySource propertySource = new MockPropertySource();
+		propertySource.setProperty("spring.redis.sentinel.master", "myMaster");
+		propertySource.setProperty("spring.redis.sentinel.nodes",
+				StringUtils.collectionToCommaDelimitedString(Arrays.asList(HOST_AND_PORT_1, HOST_AND_PORT_2, HOST_AND_PORT_3)));
+
+		RedisSentinelConfiguration config = new RedisSentinelConfiguration(propertySource);
+
+		assertThat(config.getSentinels().size(), is(3));
+		assertThat(config.getSentinels(),
+				hasItems(new RedisNode("127.0.0.1", 123), new RedisNode("localhost", 456), new RedisNode("localhost", 789)));
+	}
+}