MockingOfInstanceMethodsInFinalSystemClassTest.java

/*
 * Copyright 2009 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 samples.junit4.finalmocking;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.easymock.EasyMock.expect;
import static org.junit.Assert.assertEquals;
import static org.powermock.api.easymock.PowerMock.*;

/**
 * Test class to demonstrate non-static final mocking of instance methods in
 * system classes.
 */
@RunWith(PowerMockRunner.class)
@PrepareForTest(MockingOfInstanceMethodsInFinalSystemClassTest.class)
public class MockingOfInstanceMethodsInFinalSystemClassTest {

	@Test
	public void assertThatMockingOfInstanceMethodsInFinalSystemClassesWorks() throws Exception {
		Long tested = createMock(Long.class);
		expect(tested.longValue()).andReturn(22L);
		replayAll();

		assertEquals(22L, tested.longValue());

		verifyAll();
	}

	@Test
	public void assertThatMockingOfInstanceMethodsInStringWorks() throws Exception {
		String tested = createMock(String.class);
		expect(tested.charAt(2)).andReturn('A');
		replayAll();

		assertEquals('A', tested.charAt(2));

		verifyAll();
	}

	@Test
	public void assertThatPartialMockingOfInstanceMethodsInFinalSystemClassesWhenNotInvokingConstructorWorks()
			throws Exception {
		Long tested = createPartialMock(Long.class, "doubleValue");
		expect(tested.doubleValue()).andReturn(54d);
		replayAll();

		assertEquals(0, tested.longValue());
		assertEquals(54d, tested.doubleValue(), 0.0d);

		verifyAll();
	}

	@Test
	public void assertThatPartialMockingOfInstanceMethodsInFinalSystemClassesWhenNotInvokingNonDefaultConstructorWorks()
			throws Exception {
		Long tested = createPartialMock(Long.class, new String[] { "doubleValue" }, 27L);
		expect(tested.doubleValue()).andReturn(54d);
		replayAll();

		assertEquals(27L, tested.longValue());
		assertEquals(54d, tested.doubleValue(), 0.0d);

		verifyAll();
	}

}