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[英]Mockito : java.lang.NullPointerException when calling method from mocked Class
[英]java.lang.NullPointerException is occuring due to property is not loading in Mockito when mocking a method
我是Mockito的新手,由於無法從appication.propertie
的文件中加載屬性,因此我面臨一個問題。
問題陳述:我正在嘗試模擬使用application.properties文件中的屬性的方法。 當控件到達要加載屬性值的行時,它顯示為null,並且由於此Mockito拋出java.lang.NullPointerException
。
我正在尋找的是在模擬方法時如何從application.properties文件加載屬性。 在這里我正在嘗試加載全局變量partsListGlobal
。請幫助我如何實現這一目標。
這是我下面的代碼片段。
@Service
public class ClimoDiagnosticReportServImpl implements ClimoDiagnosticReportService {
@Value("${PARTS_LIST}")
private String partsListGlobal;
@Override
public boolean getSomeResult() {
String[] partsListLocal = getPartsList();
List<String> partsList = Arrays.asList(partsListGlobal);
if (partsList.contains("PART_X1"))
return true;
else
return false;
}
public String[] getPartsList() {
return partsListGlobal.split(",");// Here is the error occuring due to partsListGlobal is not loading the value from application.properties file.
}
}
@RunWith(MockitoJUnitRunner.class)
public class ClimoDiagnosticReportServImplTest {
@InjectMocks
private ClimoDiagnosticReportServImpl serviceReference1;
@Mock
private ClimoDiagnosticReportServImpl serviceReference12;
@Before
public void setup() {
MockitoAnnotations.initMocks(this);
}
@Test
public void getSomeResultTest() {
boolean result1 = false;
String[] strArray = new String[2];
strArray[0] = "P1";
strArray[1] = "P2";
Mockito.when(serviceReference12.getPartsList()).thenReturn(strArray);
boolean result2 = serviceReference1.getSomeResult();
Assert.assertEquals(result1,result2);
}
}
錯誤:
com.test.serviceimpl.ClimoDiagnosticReportServImpl.getSomeResult(ClimoDiagnosticReportServServimpl.java:57)上com.test.serviceimpl.ClimoDiagnosticReportServImpl.getPartsList(ClimoDiagnosticReportServImpl.java:68)處的java.lang.NullPointerException位於sun.reflect.NativeMethodAccessorImpl.invoke的ClimoDiagnosticReportServImplTest.java:74)(位於Sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)的本地方法)(位於Sun.reflect.DelegatingMethodAccessorImpl.invoke(Java方法的DelegatingMethodAccessorImpl.java:43) org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall(FrameworkMethod.java:50)的org.junit.internal.runners.model.ReflectiveCallable.run(.lang.reflect.Method.invoke(Method.java:498)在org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)在org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)在ReflectiveCallable.java:12) org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)上的.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)在org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java :78)在org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)在org.junit.runners.ParentRunner $ 3.run(ParentRunner.java:290)在org.junit.runners.ParentRunner $ 1.schedule(父母在org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)在org.junit.runners.ParentRunner.access $ 000(ParentRunner.java:58)在org.junit.runners.ParentRunner $ 2在org.mockito的org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)的org.junit.runners.ParentRunner.run(ParentRunner.java:363)的.evaluate(ParentRunner.java:268) org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)的Runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)在org.eclipse.jdt.internal org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)上的.junit.runner.TestExecution.run(TestExecution.java:38),位於org.eclipse.jdt.internal.junit.runner org.eclipse.jdt.internal.junit.runner上的.RemoteTestRunner.runTests(RemoteTestRunner.java:678)org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main上的.RemoteTestRunner.run(RemoteTestRunner.java:382) (RemoteTestRunner.java:192)
提前謝謝大家。
您沒有任何要在服務中進行模擬的依賴項。 因此,完全不需要Mockito。 您需要做的是設置私有String字段,該字段由Spring使用反射在應用程序中填充。
只需遵循使用cnstructor注入而不是字段注入的最佳實踐os,這將使您的代碼可測試(這是最佳實踐的原因之一):
@Service
public class ClimoDiagnosticReportServImpl implements ClimoDiagnosticReportService {
private String partsListGlobal;
public ClimoDiagnosticReportServImpl(@Value("${PARTS_LIST}") String partsListGlobal) {
this.partsListGlobal = partsListGlobal;
}
// ...
}
您的測試現在可以簡化為
public class ClimoDiagnosticReportServImplTest {
@Test
public void shouldReturnTrueIfPropertyContainsPartX1() {
ClimoDiagnosticReportServImpl service = new ClimoDiagnosticReportServImpl("a,b,c,PART_X1,d");
assertTrue(service.getSomeResult());
}
@Test
public void shouldReturnFalseIfPropertyDoesNotContainPartX1() {
ClimoDiagnosticReportServImpl service = new ClimoDiagnosticReportServImpl("a,b,c,d");
assertFalse(service.getSomeResult());
}
}
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