MockSelfDemoTest.java

/*
 * Copyright 2008 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.partialmocking;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.reflect.Whitebox;
import org.powermock.reflect.exceptions.ConstructorNotFoundException;
import samples.partialmocking.MockSelfDemo;
import samples.partialmocking.MockSelfWithNoDefaultConstructorDemo;

import java.sql.Connection;

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

@RunWith(PowerMockRunner.class)
@PrepareForTest(MockSelfDemo.class)
public class MockSelfDemoTest {

    private MockSelfDemo tested;

    @Test
    public void testMockMultiple_ok() throws Exception {
        tested = createPartialMock(MockSelfDemo.class, "aMethod2", "getString");

        tested.aMethod2();
        expectLastCall().times(1);

        final String expected = "Hello altered world";
        expect(tested.getString("world")).andReturn(expected);

        replay(tested);

        String actual = tested.aMethod();

        verify(tested);

        assertEquals("Result ought to be \"Hello altered world\".", expected, actual);
    }

    @Test
    public void testMockMultiple_sameName() throws Exception {
        tested = createPartialMock(MockSelfDemo.class, "getString");

        final String firstString = "A message: ";
        expectPrivate(tested, "getString").andReturn(firstString);

        final String secondString = "altered world";
        expect(tested.getString("world2")).andReturn(secondString);
        final String expected = firstString + secondString;

        replay(tested);

        String actual = tested.getTwoStrings();

        verify(tested);

        assertEquals("Result ought to be \"A message:Hello altered world\".", expected, actual);
    }

    @Test
    public void testMockSingleMethod() throws Exception {
        tested = createPartialMock(MockSelfDemo.class, "timesTwo", int.class);

        final int expectedInt = 2;
        final int expectedInteger = 8;
        expect(tested.timesTwo(4)).andReturn(expectedInt);

        replay(tested);

        int actualInt = tested.timesTwo(4);
        int actualInteger = tested.timesTwo(new Integer(4));

        verify(tested);

        assertEquals(expectedInt, actualInt);
        assertEquals(expectedInteger, actualInteger);
    }

    @Test
    public void testMockAllExcept_parametersDefined() throws Exception {
        tested = createPartialMockForAllMethodsExcept(MockSelfDemo.class, "getString2", String.class);

        final String expected = "Hello altered world";
        expect(tested.getString2()).andReturn(expected);

        replay(tested);
        assertEquals(expected, tested.getString2());
        assertEquals("Hello string", tested.getString2("string"));
        verify(tested);
    }

    @Test
    public void testMockAllExcept_single() throws Exception {
        tested = createPartialMockForAllMethodsExcept(MockSelfDemo.class, "aMethod");
        tested.aMethod2();
        expectLastCall().times(1);

        final String expected = "Hello altered world";
        expect(tested.getString("world")).andReturn(expected);

        replay(tested);

        String actual = tested.aMethod();

        verify(tested);

        assertEquals("Result ought to be \"Hello altered world\".", expected, actual);
    }

    @Test
    public void testMockAllExcept_multiple() throws Exception {
        tested = createPartialMockForAllMethodsExcept(MockSelfDemo.class, "timesTwo", "timesThree");

        final String expected = "A new value";
        expect(tested.getString2()).andReturn(expected);

        replay(tested);

        assertEquals(4, tested.timesTwo(2));
        assertEquals(4, tested.timesTwo(new Integer(2)));
        assertEquals(6, tested.timesThree(2));
        assertEquals(expected, tested.getString2());

        verify(tested);
    }

    @Test
    public void testCreatePartialMockAndInvokeObjectConstructor() throws Exception {
        tested = createPartialMock(MockSelfDemo.class, new String[] { "aMethod2", "getString" }, new Object());

        tested.aMethod2();
        expectLastCall().times(1);

        final String expected = "Hello altered world";
        expect(tested.getString("world")).andReturn(expected);

        replay(tested);

        String actual = tested.aMethod();

        verify(tested);

        assertEquals("Result ought to be \"Hello altered world\".", expected, actual);
    }

    @Test
    public void testCreatePartialMockAndInvokeDefaultConstructor() throws Exception {
        tested = createPartialMockAndInvokeDefaultConstructor(MockSelfDemo.class, "aMethod2", "getString");

        tested.aMethod2();
        expectLastCall().times(1);

        final String expected = "Hello altered world";
        expect(tested.getString("world")).andReturn(expected);

        replay(tested);

        String actual = tested.aMethod();

        verify(tested);

        assertEquals("Result ought to be \"Hello altered world\".", expected, actual);
    }

    @Test
    public void partialMockingWithNullArgumentWorks() throws Exception {
        final MockSelfDemo tested = createPartialMock(MockSelfDemo.class, "establishConnection");
        Connection conn=null;
        Whitebox.invokeMethod(tested, "establishConnection", conn);
    }

    @PrepareForTest(MockSelfWithNoDefaultConstructorDemo.class)
    @Test
    public void testCreatePartialMockAndInvokeDefaultConstructor_noDefaultConstructorFound() throws Exception {
        try {
            createPartialMockAndInvokeDefaultConstructor(MockSelfWithNoDefaultConstructorDemo.class, "aMethod2");
            fail("Should throw ConstructorNotFoundException!");
        } catch (ConstructorNotFoundException e) {
            assertEquals("Failed to lookup constructor with parameter types [ <none> ] in class samples.partialmocking.MockSelfWithNoDefaultConstructorDemo.", e.getMessage());
        }
    }
}