DATAREDIS-316 - Polishing.

Extend JavaDoc documentation. Spelling fixes. Add Expiration.from factory method to create Expiration from all available time units.

Original pull request: #170.

src/test/java/org/springframework/data/redis/core/types/ExpirationUnitTests.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2016 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.core.types;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Test;
+
+/**
+ * @author Mark Paluch
+ */
+public class ExpirationUnitTests {
+
+	/**
+	 * @see DATAREDIS-316
+	 */
+	@Test
+	public void fromDefault() throws Exception {
+
+		Expiration expiration = Expiration.from(5, null);
+
+		assertThat(expiration.getExpirationTime(), is(5L));
+		assertThat(expiration.getTimeUnit(), is(TimeUnit.SECONDS));
+	}
+
+	/**
+	 * @see DATAREDIS-316
+	 */
+	@Test
+	public void fromNanos() throws Exception {
+
+		Expiration expiration = Expiration.from(5L * 1000 * 1000, TimeUnit.NANOSECONDS);
+
+		assertThat(expiration.getExpirationTime(), is(5L));
+		assertThat(expiration.getTimeUnit(), is(TimeUnit.MILLISECONDS));
+	}
+
+	/**
+	 * @see DATAREDIS-316
+	 */
+	@Test
+	public void fromMinutes() throws Exception {
+
+		Expiration expiration = Expiration.from(5, TimeUnit.MINUTES);
+
+		assertThat(expiration.getExpirationTime(), is(5L * 60));
+		assertThat(expiration.getTimeUnit(), is(TimeUnit.SECONDS));
+	}
+}