DequeMapTest.java

/*
 * Copyright 2013 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 com.google.gwt.user.server.rpc;

import com.google.gwt.user.server.rpc.impl.DequeMap;

import junit.framework.TestCase;

/**
 * Verifies {@link DequeMap}.
 */
public class DequeMapTest extends TestCase {

  public void testIsEmpty() throws Exception {
    DequeMap<String, String> m = new DequeMap<String, String>();
    assertTrue(m.isEmpty());
    assertEquals(null, m.get("foo"));

    m.add("foo", "first");
    assertFalse(m.isEmpty());
    assertEquals("first", m.get("foo"));

    m.add("foo", "second");
    assertFalse(m.isEmpty());
    assertEquals("second", m.get("foo"));

    assertEquals(null, m.remove("unknown"));
    assertFalse(m.isEmpty());

    assertEquals("second", m.remove("foo"));
    assertFalse(m.isEmpty());
    assertEquals("first", m.get("foo"));

    assertEquals("first", m.remove("foo"));
    assertTrue(m.isEmpty());
    assertEquals(null, m.get("foo"));

    assertEquals(null, m.remove("foo"));
    assertTrue(m.isEmpty());
  }
}