EasyMock/PowerMock - 模拟静态方法抛出错误：没有可用的模拟的最后一次调用

Question

我正在编写一个简单的 Java 类来测试 EasyMock/PowerMock 功能以模拟类中的静态方法。

所以我只是模拟 Math.random 方法以返回 constant 值用于测试目的。

这是我的代码：

package x.y.z;

import org.easymock.EasyMock;
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.testng.annotations.BeforeClass;
import org.testng.annotations.Test;



@RunWith(PowerMockRunner.class)
@PrepareForTest(Math.class)
public class PowerMockStaticTestExample {

    @BeforeClass
    public static void setupBeforeClass() {
        try {
            PowerMock.mockStatic(Math.class);
            EasyMock.expect(Math.random()).andReturn(0.50).anyTimes();
            PowerMock.replay(Math.class);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }

    }

    @Test
    public void dummyTest()
    {
        System.out.println("DummyTest Called!");
        assert true==true;
    }

    @Test
    public void testMath()
    {
        System.out.println("Math Test Start "+Math.random());
        assert true==true;

    }


 }

依赖关系：

我正在使用：easyMock: org.easymock:easymock:3.1，

powerMockEasyMockFull: org.powermock:powermock-easymock-release-full:1.5.1

java 1.7.0_80.

但每次我尝试使用testng 运行这个测试类；它抛出以下异常：

java.lang.IllegalStateException: no last call on a mock available
        at org.easymock.EasyMock.getControlForLastCall(EasyMock.java:520)
        at org.easymock.EasyMock.expect(EasyMock.java:498)
        at x.y.z.PowerMockStaticTestExample.setupBeforeClass(PowerMockStaticTestExample.java:40)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
        at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
        at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
        at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
        at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
        at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
        at org.testng.TestRunner.privateRun(TestRunner.java:767)
        at org.testng.TestRunner.run(TestRunner.java:617)
        at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)

在浏览了很多关于 SO 和 Google 的帖子之后；终于想到在这里问这个问题了。

希望这里的专家能帮助我。提前致谢！

Answer 1

您似乎在使用 TestNG（查看导入）。但使用的跑步者是 JUnit 跑步者。

那么，PowerMock 不适用于BeforeClass。您需要使用Before。这是一个工作示例。

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;

@RunWith(PowerMockRunner.class)
@PrepareForTest(Math.class)
public class PowerMockStaticTestExample {

    @Before
    public void setupBeforeClass() {
        PowerMock.mockStatic(Math.class);
        EasyMock.expect(Math.random()).andReturn(0.50).anyTimes();
        PowerMock.replay(Math.class);
    }

    @Test
    public void dummyTest() {
        System.out.println("DummyTest Called!");
    }

    @Test
    public void testMath() {
        System.out.println("Math Test Start "+Math.random());
    }
}