[英]AssertionError when I try to write a unit test
我正在創建處理器來收集數據並在列表中提供它們。 但是當我嘗試為我的方法創建測試時,我發現了斷言錯誤。 我究竟做錯了什么?
我的課:
@AllArgsConstructor
public class ZteProcessor implements OurProcessor {
private final static String VENDOR = "ZTE";
private String jsonString;
private Map<String, String> metricsGU;
private Map<String, String> metricsUMTS;
private Map<String, String> metricsLTE;
@Override
public List<TimingAdvance> getTA() throws ParseException, NotFoundPatternOrMetricsException {
TimeAdvanceDataStore data = new TimeAdvanceDataStore();
AllDataFromJSONFile fromJSONFile = ProcessorUtil.getAllData(jsonString);
if (jsonString.contains("String")) {
return data.allDataToTimingAdvance(VENDOR, fromJSONFile, metricsGU, 2);
} else if (jsonString.contains("String-2")) {
return data.allDataToTimingAdvance(VENDOR, fromJSONFile, metricsUMTS, 3);
} else if (jsonString.contains("String3")) {
return data.allDataToTimingAdvance(VENDOR, fromJSONFile, metricsLTE, 4);
} else {
throw new NotFoundPatternOrMetricsException();
}
}
}
我的測試:
@RunWith(PowerMockRunner.class)
@PrepareForTest({ProcessorUtil.class})
public class ZteProcessorTest {
@Mock
private AllDataFromJSONFile fromJSONFile;
@Mock
private TimeAdvanceDataStore data;
private OurProcessor processor;
private TimingAdvance timingAdvance = new TimingAdvance();
private Map<String, String> metricsGU = new HashMap<>();
private Map<String, String> metricsUMTS = new HashMap<>();
private Map<String, String> metricsLTE = new HashMap<>();
@Test
public void getTATest() throws Exception {
String jsonString = " { String : value}";
processor = new ZteProcessor(jsonString, metricsGU, metricsUMTS, metricsLTE);
List<TimingAdvance> list = new ArrayList<>();
list.add(timingAdvance);
PowerMockito.mockStatic(ProcessorUtil.class);
when(ProcessorUtil.getAllData(jsonString)).thenReturn(fromJSONFile);
when(data.allDataToTimingAdvance(jsonString, fromJSONFile, metricsGU, 2)).thenReturn(list);
assertEquals(list, processor.getTA());
}
}
堆棧跟蹤:
java.lang.AssertionError:
Expected :[TimingAdvance{filial='null', vendor='null', cellName='null', periodDate=null, taMetrics=null}]
Actual :[]
<Click to see difference>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:144)
我的 ZteProcessor 使用類ProcessorUtill
靜態方法getAllData(jsonString)
。 為此,我使用了 powermock。
問題源於這樣一個事實,即您在TimeAdvanceDataStore data
模擬上設置您的期望,但您正在測試的方法中創建TimeAdvanceDataStore
的新實例。
由於您已經在使用 PowerMockito,您可以利用新對象創建,例如
PowerMockito.whenNew(TimeAdvanceDataStore.class)
.withAnyArguments().thenReturn(data);
最重要的是,想想你的應用程序中有多少 ZTEProcessor 和 TimeAdvanceDataStores。 您是否總是希望在每次調用 getTA 時都有一個新的 TimeAdvanceDataStore 實例?
如果沒有,只需在構造函數中傳遞 TimeAdvanceDataStore。
如果是,當您無法使用 PowerMockito 時,常用的方法是:
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