在将单元测试postmortem编码到另一个项目创建的代码时,我遇到了如何使用initBinder模拟与控制器绑定的验证器的这个问题？
通常我会考虑确保我的输入是有效的,并且在验证器中进行一些额外的调用,但在这种情况下,验证器类与通过几个数据源进行检查相结合,并且测试变得相当麻烦.耦合可追溯到使用的一些旧的常用库,并且不在我目前的工作范围内来修复它们.
起初,我试图使用PowerMock和嘲笑静态方法来嘲笑验证器的外部依赖关系,但是最终遇到一个类,当类被创建时需要一个数据源,没有找到一个方法.
然后,我试图使用普通的mockito工具来嘲笑验证器,但是也没有.然后尝试将验证器设置在mockMvc调用中,但不会为验证器注册@Mock注释.最后跑到this question.但是由于控制器本身没有现场验证器,所以也失败了.那么,我该如何解决这个问题呢？
验证器：
public class TerminationValidator implements Validator {
// JSR-303 Bean Validator utility which converts ConstraintViolations to Spring's BindingResult
private CustomValidatorBean validator = new CustomValidatorBean();
private Class<? extends Default> level;
public TerminationValidator(Class<? extends Default> level) {
this.level = level;
validator.afterPropertiesSet();
}
public boolean supports(Class<?> clazz) {
return Termination.class.equals(clazz);
}
@Override
public void validate(Object model,Errors errors) {
BindingResult result = (BindingResult) errors;
// Check domain object against JSR-303 validation constraints
validator.validate(result.getTarget(),result,this.level);
[...]
}
[...]
}
控制器：
public class TerminationController extends AbstractController {
@InitBinder("termination")
public void initBinder(WebDataBinder binder,HttpServletRequest request) {
binder.setValidator(new TerminationValidator(Default.class));
binder.setAllowedFields(new String[] { "termId[**]","terminationDate","accountSelection","iban","bic" });
}
[...]
}
测试类：
@RunWith(MockitoJUnitRunner.class)
public class StandaloneTerminationTests extends BaseControllerTest {
@Mock
private TerminationValidator terminationValidator = new TerminationValidator(Default.class);
@InjectMocks
private TerminationController controller;
private MockMvc mockMvc;
@Override
@Before
public void setUp() throws Exception {
initMocks(this);
mockMvc = standaloneSetup(controller)
.setCustomArgumentResolvers(new TestHandlerMethodArgumentResolver())
.setValidator(terminationValidator)
.build();
ReflectionTestUtils.setField(controller,"validator",terminationValidator);
when(terminationValidator.supports(any(Class.class))).thenReturn(true);
doNothing().when(terminationValidator).validate(any(),any(Errors.class));
}
[...]
}
例外：
java.lang.IllegalArgumentException: Could not find field [validator] of type [null] on target [my.application.web.controller.TerminationController@560508be]
at org.springframework.test.util.ReflectionTestUtils.setField(ReflectionTestUtils.java:111)
at org.springframework.test.util.ReflectionTestUtils.setField(ReflectionTestUtils.java:84)
at my.application.web.controller.termination.StandaloneTerminationTests.setUp(StandaloneTerminationTests.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
解决方法
您应该避免在Spring应用程序中创建新的业务对象.您应该总是从应用程序的上下文中获取它们 – 它将在您的测试中轻松嘲笑它们.
在你的用例中,你应该简单地创建一个bean的验证器(比如说defaultTerminationValidator)并将它注入你的控制器中：
public class TerminationController extends AbstractController {
private TerminationValidator terminationValidator;
@Autowired
public setDefaultTerminationValidator(TerminationValidator validator) {
this.terminationValidator = validator;
}
@InitBinder("termination")
public void initBinder(WebDataBinder binder,HttpServletRequest request) {
binder.setValidator(terminationValidator);
binder.setAllowedFields(new String[] { "termId[**]","bic" });
}
[...]
}
这样,您就可以在测试中简单地注入模拟.
