如何使用powermock来存根Instant对象

PowerMock是一个Java测试框架，它扩展了Mockito和EasyMock，可以用于模拟和存根静态方法、私有方法、构造函数和final类等。使用PowerMock来存根Instant对象的步骤如下：

首先，确保你的项目中已经引入了PowerMock的依赖。可以在Maven或Gradle配置文件中添加以下依赖：

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-core</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>

在测试类上添加PowerMockRunner运行器注解，例如：

@RunWith(PowerMockRunner.class)
@PrepareForTest({YourClass.class}) // 需要存根的类
public class YourTestClass {
    // 测试方法
}

在测试方法中，使用PowerMockito.mockStatic()方法来模拟静态方法的行为，例如：

@Test
public void testYourMethod() {
    PowerMockito.mockStatic(YourClass.class);
    // 存根静态方法的行为
    YourClass yourClassMock = Mockito.mock(YourClass.class);
    Mockito.when(yourClassMock.yourStaticMethod()).thenReturn(yourExpectedResult);
    PowerMockito.when(YourClass.class, "yourStaticMethod").thenReturn(yourExpectedResult);
    
    // 调用被测试方法
    YourClass.yourStaticMethod();
    
    // 断言结果
    // ...
}

如果需要存根构造函数，可以使用PowerMockito.whenNew()方法，例如：

@Test
public void testYourMethod() throws Exception {
    YourClass yourClassMock = Mockito.mock(YourClass.class);
    PowerMockito.whenNew(YourClass.class).withNoArguments().thenReturn(yourClassMock);
    
    // 调用被测试方法
    YourClass instance = new YourClass();
    
    // 断言结果
    // ...
}

这样，你就可以使用PowerMock来存根Instant对象了。记得在测试类上使用PowerMockRunner运行器注解，并在需要存根的类上使用@PrepareForTest注解。通过PowerMockito.mockStatic()方法模拟静态方法，使用PowerMockito.when()方法定义存根的行为。如果需要存根构造函数，可以使用PowerMockito.whenNew()方法。

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import org.easymock.EasyMock;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.easymock.PowerMock;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.springframework.aop.framework.Advised;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.util.ReflectionTestUtils;

@RunWith(PowerMockRunner.class)
@PrepareForTest( { PaymentReconService.class })
@PowerMockIgnore(“org.apache.log4j.*”)
public class PaymentGatherServiceTest extends PaymentServiceTestBase {

@Autowired
private GatherService gatherResultService;
@Autowired
private PaymentBaseDAO baseDAO;

/**
* 测试正常postback
*/
public void testPaymentSucc() {
PaymentReconService mock = mock();

Long pbId = 10004L;
String pbStatus = PaymentBaseEO.PB_STATUS_GATHER_SUCC;
BigDecimal succAmount = new BigDecimal(“99.3”);

try {
GatherOrderRO ro = gatherResultService.processPaymentGather(pbId, pbStatus, succAmount, succAmount);
assertNotNull(ro);

} catch (SystemException e) {
fail(e.getLocalizedMessage());
} catch (BusinessException e) {
fail(e.getBusinessCode());
}
EasyMock.verify(mock);
}

/**
* MOCK PaymentReconService实现
* @return
*/
private PaymentReconService mock() {
PaymentReconRO mockRO = new PaymentReconRO(PaymentReconRO.Status.SUCESS, “OK”);

PaymentReconService mock = EasyMock.createMock(PaymentReconServiceImpl.class);
EasyMock.expect(mock.paymentSuccessRecon(EasyMock.anyObject(Long.class))).andReturn(mockRO);
EasyMock.replay(mock);
//这里把依赖的数据注进去
ReflectionTestUtils.s