1. 对静态方法的mock

代码如下：

@RunWith(PowerMockRunner.class)
@PrepareForTest({HPPrinter.class})
public class StationerTest {

    @Mock
    private Payee payee;

    @InjectMocks
    private Stationer stationer;

    @Test
    public void testPrintSuccess(){
        PowerMockito.mockStatic(HPPrinter.class);
        when(HPPrinter.getOut()).thenReturn(System.out);

        stationer.print("I am testing powermock");

        verify(payee).collect();
    }
}

/**
 * A stationer is a person who sells paper, envelopes, pens, and other equipment used for writing
 */
public class Stationer {

    private Payee payee;

    public Stationer() {
    }

    public Stationer(Payee payee) {
        this.payee = payee;
    }

    public void print(String content){
        HPPrinter.getOut().print(content);
        payee.collect();
    }

}

public class Payee {
    public void collect() {
        System.out.println("Money received");
    }
}

public class HPPrinter {

    private static PrintStream out = null;

    public static void setOut(PrintStream out) {
        HPPrinter.out = out;
    }

    public static PrintStream getOut() {
        return out;
    }
}

pom.xml

<dependency>
	<groupId>org.mockito</groupId>
	<artifactId>mockito-core</artifactId>
    <version>1.10.19</version>
	<scope>test</scope>
</dependency>

<dependency>
	<groupId>org.powermock</groupId>
	<artifactId>powermock-module-junit4</artifactId>
	<version>1.7.4</version>
    <scope>test</scope>
</dependency>

<dependency>
	<groupId>org.powermock</groupId>
	<artifactId>powermock-api-mockito</artifactId>
	<version>1.7.4</version>
    <scope>test</scope>
</dependency>

Tips: 当powermock-module-junit4,powermock-api-mockito采用版本1.6.1时，运行测试会报错：

Exception in thread "main" java.lang.IllegalAccessError: tried to access class org.mockito.internal.creation.cglib.CGLIBHacker from class org.mockito.internal.creation.MethodInterceptorFilter

将版本修改成1.7.4后，运行成功。