Question

我有一个简单的案例来说明一个更复杂的案例（哦遗产代码，我爱你，吟游诗人会以你的名义唱出奇妙的歌曲）。

将一组课程描述如下：

实用程序类：

package org.osef.test;

public final class A {

    private static A instance;
    public static String status;

    private A() {
        initPaths();
    }

    public static A getInstance(){
            if(instance==null){
                instance = new A();
            }
            return instance;
    }

    private void initPaths() {
        A.status = "I have been in the method !";
    }
    public String doStuff() {
        return "stuff done ...";
    }
}

这个叫它的班级

package org.osef.test;

public class B {

    public String doBdo() {
        A instance = A.getInstance();
        return instance.doStuff();
    }
}

班级测试了这堆......咳咳......非常难以理解＆＃34;逻辑＆＃34;。

package org.osef.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

import org.easymock.EasyMock;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.easymock.PowerMock;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.reflect.Whitebox;

@RunWith(PowerMockRunner.class)
@PrepareForTest({ A.class })
public class BTest {

    @Before
    public void setUp() {
        PowerMock.replace(PowerMock.method(A.class, "getInstance")).with(PowerMock.method(BTest.class, "giveOutInstance"));

        A a = A.getInstance();

        EasyMock.expect(a.doStuff()).andReturn("lol");
        EasyMock.replay(a);
    }

    @Test
    public void testDoBdo() {

        B b = new B();
        assertEquals("lol", b.doBdo());
        assertNull(A.status);
    }

    public static A giveOutInstance(){
        return Whitebox.newInstance(A.class);
    }
}

另一种做法如下：

package org.osef.test;

//[imports ommited here but are the same that those of the previous example]

@RunWith(PowerMockRunner.class)
@PrepareForTest({ A.class })
public class BTest {

    @Before
    public void setUp() {
        PowerMock.mockStatic(A.class);
        A a = Whitebox.newInstance(A.class);
        EasyMock.expect(A.getInstance()).andReturn(a);
        PowerMock.replay(A.class);

        EasyMock.expect(a.doStuff()).andReturn("lol");

        EasyMock.replay(a);
    }

    @Test
    public void testDoBdo() {

        B b = new B();
        assertEquals("lol", b.doBdo());
        assertNull(A.status);
    }

}

但在所有情况下，我得到：

java.lang.IllegalStateException：没有最后一次调用可用的模拟在org.easymock.EasyMock.getControlForLastCall（EasyMock.java:560）在org.easymock.EasyMock.expect（EasyMock.java:538）在org.osef.test.BTest.setUp（BTest.java:25） ...

我只需要测试最后一节课。
我需要避免使用它的构造函数逻辑（在我对doStuff＆＃34;方法的测试中，这些逻辑是无趣的和无关紧要的。）
我必须测试doStuff。

知道如何有效地做我想做的事吗？

Answer 1

我认为您的问题是您没有重播课程，您只是在每个测试中重播A的模拟实例。

PowerMock.replayAll()是你的朋友。它会强制你所期望的类处于重放模式，然后通过调用静态方法返回你的模拟实例。

以下是我为您的示例制作的示例测试：

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

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

@RunWith(PowerMockRunner.class)
@PrepareForTest(A.class)
public class BTest{

    @Test
    public void thatCallingClassMakesExpectedCalls() {
        final A mockA = PowerMock.createMock(A.class);
        EasyMock.expect(mockA.doStuff()).andReturn("lol").anyTimes();

        PowerMock.mockStatic(A.class);
        EasyMock.expect(A.getInstance()).andReturn(mockA).anyTimes();

        PowerMock.replayAll(mockA);

        final B callingClass = new B();
        final String doBdo = callingClass.doBdo();
        assertThat(doBdo, is("lol"));

        EasyMock.verify(mockA);
        PowerMock.verifyAll();
    }
}

如何使用powerMock在同一个类中模拟静态和非静态方法？

1 个答案: