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我正在执行一些模拟测试，但是我在 1 个具有静态方法的类中遇到了一些问题，我在测试类的 setUp() 方法中进行了模拟

有这个类：

public class ResponseFileWriteHelper {


    public static void write(HttpServletResponse response, String fileName, StreamWriter writer) {

        response.setHeader("Cache-Control", "");
        response.setContentType("application/octet");
        if (!StringUtils.isBlank(fileName)) {
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        }

        try {
            writer.doWrite(response.getOutputStream());
        }
        catch (Exception e) {
            throw new RuntimeException(e);
        }    
    }
}

这是我要测试的控制器：

public class ManageDeviceController extends SimpleFormController {

...

private void generateDevicexBeneficiaryList(
            Collection<Integer> selectedYears, PriorityAreaKey priorityAreaKey, Language language, Collection<DeviceStatus> statuses, HttpServletResponse response) throws Exception {

        final List<ReportItem> reportItems
            = DeviceListReportService.getDevicesxBeneficiaryForYears(selectedYears, priorityAreaKey, language, statuses);

        ResponseFileWriteHelper.write(response, "DevicesxBeneficiaryList.xls", new StreamWriter() {

            @Override
            public void doWrite(OutputStream outputStream) throws Exception {
                DeviceListExcelReportRendererBuilder.build().renderToStream(
                    reportItems, outputStream);
            }});
    }

}

这里是测试类

@RunWith(MockitoJUnitRunner.class)
public class SelectDeviceListExcelReportControllerTest {

    public void setUp() {
        PowerMockito.mockStatic (ResponseFileWriteHelper.class);
        EDeviceSessionContext.getInstance().setSession(httpSession);
        when(request.getSession()).thenReturn(httpSession);
        when(request.getLocale()).thenReturn(Locale.ENGLISH);
        messages.initialize();
    }

    @SuppressWarnings("unchecked")
    @Test
    @PrepareForTest(ResponseFileWriteHelper.class)
    public void successTest() throws Exception {

        TableItemBuilder tableItemBuilder = 
                new TableItemBuilder(new LabelCellItem("success.test"));

        List<ReportItem> expectedData = Arrays.asList(
            new ReportItem("success.test",Arrays.asList(tableItemBuilder.getTableItem())));

        final ByteArrayOutputStream resultData = new ByteArrayOutputStream();

        ServletOutputStream output = new ServletOutputStream() {

            @Override
            public void write(int val) throws IOException {
                resultData.write(val);
            }
        };

        when(response.getOutputStream()).thenReturn(output);

        when(deviceListReportService.getDevicesxBeneficiaryForYears(
            any(List.class), any(PriorityAreaKey.class), any(Language.class), any(Collection.class))).thenReturn(expectedData);


        doCall();

        //assertArrayEquals(expectedData, resultData);
    }
}

但是测试崩溃了，因为这里有一个 java.lang.NullPointer：

ResponseFileWriteHelper.write(response, "DevicesxBeneficiaryList.xls", new StreamWriter() {
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1 回答 1

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@PrepareForTest()仅在您的PowerMockRunner.class测试类中使用，因此您需要@RunWith(PowerMockRunner.class)在测试类中添加。

但它带来的另一个问题是您真的想SpringJUnit4ClassRunner.class用作测试运行器，感谢 powermock 已经意识到这个问题，它提供了PowerMockRunnerDelegate注释来实现它。

工作副本将是这样的：

@WebAppConfiguration
@ContextConfiguration(locations = {
        "......"
        )
@RunWith(PowerMockRunner.class)
@PowerMockRunnerDelegate(SpringJUnit4ClassRunner.class)
@PowerMockIgnore("javax.management.*") // to specify that all classes under the specified package be loaded by the system class loader
@PrepareForTest({Static.class})
public void ControllerTest {
    public void testMockStatic() {
        PowerMockito.mockStatic(Static.class);
        ......
    }
}
于 2017-08-18T08:27:52.113 回答