Adding a basic FixedOrderComparatorTest

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1159026 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/lang3/compare/FixedOrderComparatorTest.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.commons.lang3.compare;
+
+import static org.junit.Assert.*;
+
+import java.util.Comparator;
+import java.util.Arrays;
+
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * <p>
+ * Tests the methods in the {@link org.apache.commons.lang3.compare.FixedOrderComparator} class.
+ * </p>
+ * 
+ * @version $Id: RangeTest.java 1147537 2011-07-17 06:10:37Z mbenson $
+ */
+public class FixedOrderComparatorTest {
+
+    @Before
+    public void setUp() {
+    }
+
+    //-----------------------------------------------------------------------
+    @Test
+    public void testJavadocExample() {
+        String[] planets = {"Mercury", "Venus", "Earth", "Mars"};
+        String[] modified = {"Mercury", "Venus", "Earth", "Mars"};
+        Comparator distanceFromSun = new FixedOrderComparator(planets);
+        Arrays.sort(modified);                     // Sort to alphabetical order
+        Arrays.sort(modified, distanceFromSun);    // Back to original order
+        assertArrayEquals("Did not sort to fixed order", planets, modified);
+    }
+
+}