/**
 * Copyright 2009 Google Inc.
 *
 * 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.waveprotocol.wave.model.util;


import junit.framework.TestCase;

/**
 * Tests for value utility methods.
 *
 * @author anorth@google.com (Alex North)
 */

public class ValueUtilsTest extends TestCase {
  public void testNullValuesEqual() {
    assertTrue(ValueUtils.equal(null, null));
    assertFalse(ValueUtils.notEqual(null, null));
  }

  public void testOneNullNotEqual() {
    assertFalse(ValueUtils.equal(null, "foo"));
    assertTrue(ValueUtils.notEqual(null, "foo"));

    assertFalse(ValueUtils.equal("foo", null));
    assertTrue(ValueUtils.notEqual("foo", null));
  }

  public void testEqualValues() {
    assertTrue(ValueUtils.equal(foo(), foo()));
    assertFalse(ValueUtils.notEqual(foo(), foo()));
  }

  public void testUnequalValues() {
    assertFalse(ValueUtils.equal(foo(), "bar"));
    assertTrue(ValueUtils.notEqual(foo(), "bar"));
  }

  public void testDefaultValues() {
    assertEquals("aa", ValueUtils.valueOrDefault("aa", "bb"));
    assertEquals("bb", ValueUtils.valueOrDefault(null, "bb"));
    String empty = null;
    assertEquals(null, ValueUtils.valueOrDefault(null, empty));
  }

  /**
   * Creates a new instance of a string equal to "foo". Use this to
   * exercise String.equals() rather than relying on reference equality
   * of interned strings.
   */
  private String foo() {
    return new String("foo");
  }
}