JUnit的void删除方法

时间：2018-12-12 00:31:13

标签： java spring-boot junit mockito

我是JUnit的新手，正在尝试学习。我们如何为void方法编写JUnit。 我有一个无效的删除方法。我正在像下面那样编写测试，但无法正常工作。 请提出建议。

我必须为其编写测试用例的方法。

public class DoseService {
  @Autowired
  private DoseRepository doseRepo;

  public void deleteDose(int id) {
    doseRepo.deleteById(id);
 }
}

我的测试

@Autowired
private DoseService doseService;

@MockBean
public DoseRepository doseRepository;

@Test
public void testDeleteDose() {

    Dose dose = createDose();
    ArgumentCaptor<Dose> arg = ArgumentCaptor.forClass(Dose.class);
    doseService.deleteDose(dose.getDoseId());
    verify(doseRepository).deleteById(arg.capture().getDoseId());
    assertEquals("120", arg.getValue().getDoseValue());
}

private Dose createDose() {
    Dose dose = new Dose();
    dose.setDoseId(1);
    dose.setDoseValue("120");
    return dose;
}

预先感谢

已更新 

java.lang.NullPointerException
at verify(doseRepository).deleteById(arg.capture().getDoseId());
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at 
java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

3 个答案:

答案 0 :(得分：1)

单元测试仅应测试为其编写的类。因此，无需注入真实对象，仅需模拟即可。另外，您不需要Dose对象，因为您唯一需要做的就是测试DoseService对象。

我将执行以下操作：

@ExtendWith(MockitoExtension.class)//for JUnit 5, but you can add the JUnit 4 annotation
public class DoseServiceTest {
    @Mock
    private DoseRepository doseRepository;

    @InjectMocks
    private DoseService sut;//System Under Test

    @Test
    public void testDeleteDose() {
        int doseId=42;

        // perform the call
        sut.deleteDose(doseId);

        // verify the mocks
        verify(doseRepository, times(1)).deleteById(eq(doseId));
    }
}

答案 1 :(得分：0)

这是因为您正在验证ASCII code 128 is character \200 ASCII code 129 is character \201 ASCII code 130 is character \202 ASCII code 131 is character \203 ASCII code 132 is character \204 ASCII code 133 is character \205 ASCII code 134 is character \206 ASCII code 135 is character \207 ASCII code 136 is character \210 ASCII code 137 is character \211 ASCII code 138 is character \212 ASCII code 139 is character \213 ASCII code 140 is character \214 ASCII code 141 is character \215 ASCII code 142 is character \216 ASCII code 143 is character \217 ASCII code 144 is character \220 ASCII code 145 is character \221 ASCII code 146 is character \222 ASCII code 147 is character \223 ASCII code 148 is character \224 ASCII code 149 is character \225 ASCII code 150 is character \226 ASCII code 151 is character \227 ASCII code 152 is character \230 ASCII code 153 is character \231 ASCII code 154 is character \232 ASCII code 155 is character \233 ASCII code 156 is character \234 ASCII code 157 is character \235 ASCII code 158 is character \236 ASCII code 159 is character \237 ASCII code 160 is character \240 ASCII code 161 is character \241 ASCII code 162 is character \242 ASCII code 163 is character \243 ASCII code 164 is character \244 ASCII code 165 is character \245 ASCII code 166 is character \246 ASCII code 167 is character \247 ASCII code 168 is character \250 ASCII code 169 is character \251 ASCII code 170 is character \252 ASCII code 171 is character \253 ASCII code 172 is character \254 ASCII code 173 is character \255 ASCII code 174 is character \256 ASCII code 175 is character \257 ASCII code 176 is character \260 ASCII code 177 is character \261 ASCII code 178 is character \262 ASCII code 179 is character \263 ASCII code 180 is character \264 ASCII code 181 is character \265 ASCII code 182 is character \266 ASCII code 183 is character \267 ASCII code 184 is character \270 ASCII code 185 is character \271 ASCII code 186 is character \272 ASCII code 187 is character \273 ASCII code 188 is character \274 ASCII code 189 is character \275 ASCII code 190 is character \276 ASCII code 191 is character \277 ASCII code 192 is character \300 ASCII code 193 is character \301 ASCII code 194 is character \302 ASCII code 195 is character \303 ASCII code 196 is character \304 ASCII code 197 is character \305 ASCII code 198 is character \306 ASCII code 199 is character \307 方法，但是在代码中，您正在使用delete方法。

此代码应该有效：

deleteById

答案 2 :(得分：0)

在模拟操作中，您需要捕获参数。然后，您可以根据捕获的参数来声明所需的任何内容。

也许是这样吗？

verify(doseRepository).deleteById(arg.capture());
assertEquals(dose.getDoseId(), arg.getValue().getDoseId());
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