DATACMNS-790 - Added Tuple value type.

Related pull request: https://github.com/spring-projects/spring-data-mongodb/pull/327.

src/test/java/org/springframework/data/util/TupleUnitTests.java

@@ -0,0 +1,85 @@
+/*
+ * 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.util;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link Tuple}.
+ * 
+ * @author Oliver Gierke
+ */
+public class TupleUnitTests {
+
+	/**
+	 * @see DATACMNS-790
+	 */
+	@Test
+	public void setsUpSimpleInstance() {
+
+		Tuple<Integer, Integer> tuple = Tuple.of(1, 2);
+
+		assertThat(tuple.getFirst(), is(1));
+		assertThat(tuple.getSecond(), is(2));
+	}
+
+	/**
+	 * @see DATACMNS-790
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullFirstElement() {
+		Tuple.of(null, 1);
+	}
+
+	/**
+	 * @see DATACMNS-790
+	 */
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullSecondElement() {
+		Tuple.of(1, null);
+	}
+
+	/**
+	 * @see DATACMNS-790
+	 */
+	@Test
+	public void hasCorrectEquals() {
+
+		Tuple<Integer, Integer> first = Tuple.of(1, 2);
+		Tuple<Integer, Integer> second = Tuple.of(1, 2);
+
+		assertThat(first, is(first));
+		assertThat(first, is(second));
+		assertThat(second, is(first));
+	}
+
+	/**
+	 * @see DATACMNS-790
+	 */
+	@Test
+	public void hasCorrectHashCode() {
+
+		Tuple<Integer, Integer> first = Tuple.of(1, 2);
+		Tuple<Integer, Integer> second = Tuple.of(1, 2);
+		Tuple<Integer, Integer> third = Tuple.of(2, 2);
+
+		assertThat(first.hashCode(), is(second.hashCode()));
+		assertThat(first.hashCode(), is(not(third.hashCode())));
+	}
+}