Java example source code file (PrimitivesTest.java)

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Java - Java tags/keywords

nullpointertester, primitivestest, set, testcase, unsupportedoperationexception, util

The PrimitivesTest.java Java example source code

/*
 * Copyright (C) 2007 The Guava 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 com.google.common.primitives;

import com.google.common.collect.ImmutableSet;
import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.util.Set;

/**
 * Unit test for {@link Primitives}.
 *
 * @author Kevin Bourrillion
 */
public class PrimitivesTest extends TestCase {
  public void testIsWrapperType() {
    assertTrue(Primitives.isWrapperType(Void.class));
    assertFalse(Primitives.isWrapperType(void.class));
  }

  public void testWrap() {
    assertSame(Integer.class, Primitives.wrap(int.class));
    assertSame(Integer.class, Primitives.wrap(Integer.class));
    assertSame(String.class, Primitives.wrap(String.class));
  }

  public void testUnwrap() {
    assertSame(int.class, Primitives.unwrap(Integer.class));
    assertSame(int.class, Primitives.unwrap(int.class));
    assertSame(String.class, Primitives.unwrap(String.class));
  }

  public void testAllPrimitiveTypes() {
    Set<Class primitives = Primitives.allPrimitiveTypes();
    assertEquals(
        ImmutableSet.<Object>of(
            boolean.class, byte.class, char.class, double.class,
            float.class, int.class, long.class, short.class, void.class),
        primitives);

    try {
      primitives.remove(boolean.class);
      fail();
    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testAllWrapperTypes() {
    Set<Class wrappers = Primitives.allWrapperTypes();
    assertEquals(
        ImmutableSet.<Object>of(
            Boolean.class, Byte.class, Character.class, Double.class,
            Float.class, Integer.class, Long.class, Short.class, Void.class),
        wrappers);

    try {
      wrappers.remove(Boolean.class);
      fail();
    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testNullPointerExceptions() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicStaticMethods(Primitives.class);
  }
}