java 如何使用 mockito 模拟 Rest 模板
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How to Mock Rest template using mockito
提问by Rithik_Star
I am writing junit for one class(Test) which has rest template call.
我正在为一个具有休息模板调用的类（测试）编写 junit。
response = restTemplate.exchange(uri, HttpMethod.POST,
headersString, SomeObject.class)
I am writting junit using Mockito. The below mock statement throws error
我正在使用 Mockito 编写 junit。下面的模拟语句抛出错误
when(restTemplate.exchange(any(URI.class), any(HttpMethod.class),
headersString , SomeObject.class)).
Help me how to put the rest template call in the when statement for junit using Mockito.
帮助我如何使用 Mockito 将其余模板调用放在 junit 的 when 语句中。
Error:
错误：
java.lang.IllegalArgumentException: 'url' must not be null
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:534)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:518)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:463)
at (Test.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.accesswhen(restTemplate.exchange(any(URI.class), any(HttpMethod.class),
headersString , SomeObject.class)).
// ^^ ^^
0(ParentRunner.java:42)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
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:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
org.mockito.exceptions.misusing.InvalidUseOfMatchersException:
Misplaced argument matcher detected here:
-> at (Test.java:81)
You cannot use argument matchers outside of verification or stubbing.
Examples of correct usage of argument matchers:
when(mock.get(anyInt())).thenReturn(null);
doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject());
verify(mock).someMethod(contains("foo"))
Also, this error might show up because you use argument matchers with methods that cannot be mocked.
Following methods *cannot* be stubbed/verified: final/private/equals()/hashCode().
at org.mockito.internal.runners.util.FrameworkUsageValidator.testFinished(FrameworkUsageValidator.java:25)
at org.junit.runner.notification.RunNotifier.notifyListener(RunNotifier.java:145)
at org.junit.runner.notification.RunNotifier$SafeNotifier.run(RunNotifier.java:41)
at org.junit.runner.notification.RunNotifier.fireTestFinished(RunNotifier.java:142)
at org.junit.internal.runners.model.EachTestNotifier.fireTestFinished(EachTestNotifier.java:37)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:82)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.accesswhen(restTemplate.exchange(any(URI.class), any(HttpMethod.class),
eq(headersString), eq(SomeObject.class))).
0(ParentRunner.java:42)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
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:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
回答by
As probably stated by the error message, you can notmix matchers and fixed values (no matcher), like this:
正如错误消息可能说，你不能混用匹配器和固定值（不匹配），就像这样：
ResponseEntity<String> responseEntity = new ResponseEntity<String>("sampleBodyString", HttpStatus.ACCEPTED);
when(restTemplate.exchange(
Matchers.anyString(),
Matchers.any(HttpMethod.class),
Matchers.<HttpEntity<?>> any(),
Matchers.<Class<String>> any())).thenReturn(responseEntity);
You have to use the eq()matchers for fixed values, like this:
您必须将eq()匹配器用于固定值，如下所示：
import org.mockito.Matchers;
import static org.mockito.Matchers.any;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
From the Matchersjavadoc:
Warning:
If you are using argument matchers, all arguments have to be provided by matchers.
警告：
如果您使用参数匹配器，则所有参数都必须由匹配器提供。
回答by Shyam Elakapalli
Below code works,
下面的代码有效，
HttpHeaders headers = new Headers();
headers.setExpires(10000L);
ResponseEntity<String> responseEntity = new ResponseEntity<>("dummyString", headers, HttpStatus.OK);
when(restTemplate.exchange( Matchers.anyString(),
Matchers.any(HttpMethod.class),
Matchers.<HttpEntity<?>> any(),
Matchers.<Class<String>> any())).thenReturn(responseEntity);
回答by Dheeraj
A more reliable solution could be as below mentioned. I have mentioned the import statements too which have worked for me. The below piece of code perfectly mocks the rest template.
更可靠的解决方案可能如下所述。我也提到了对我有用的导入语句。下面的代码完美地模拟了其余模板。
##代码##This is the actual template to mock.
这是要模拟的实际模板。
##代码##Here the 'responseEntity' value will not be null and we can use it to perfectly assert a statement.
这里的 'responseEntity' 值不会为空，我们可以用它来完美地断言一个语句。
