java - Junit5:动态测试中动态断言工作异常

Question

我正在使用 Junit5。我想实现一个动态测试，其中测试用例在 YAML 文件中定义。现在我遇到了一个问题，如标题所示。

查看我的示例代码:

@Test
public void t1() throws Exception {
    java.lang.reflect.Method method = org.junit.jupiter.api.Assertions.class.getMethod("assertEquals", int.class, int.class);
    method.invoke(null, 1, 5);
}

@TestFactory
Collection<DynamicTest> dynamicTests() {
    DynamicTest[] list = new DynamicTest[1];
    list[0] = DynamicTest.dynamicTest("dt1", new Executable() {
        @Override
        public void execute() throws Throwable {
            java.lang.reflect.Method method = org.junit.jupiter.api.Assertions.class.getMethod("assertEquals", int.class, int.class);
            method.invoke(null, 1, 50);
        }
    });
    return Arrays.asList(list);
}

在示例代码中，我定义了一个静态测试用例 t1 和一个动态测试用例 dt1。在这两个测试中，我只是做了一个动态断言。

但是看看测试结果:

Failures (2):
  JUnit Jupiter:TestRunner:t1()
    MethodSource [className = 'com.mycompany.test.TestRunner', methodName = 't1', methodParameterTypes = '']
    => org.opentest4j.AssertionFailedError: expected: <1> but was: <5>
       org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:52)
       org.junit.jupiter.api.AssertEquals.failNotEqual (AssertEquals.java:197)
       org.junit.jupiter.api.AssertEquals.assertEquals (AssertEquals.java:154)
       org.junit.jupiter.api.AssertEquals.assertEquals (AssertEquals.java:149)
       org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:305)
       sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       java.lang.reflect.Method.invoke(Method.java:498)
       com.mycompany.test.TestRunner.t1(TestRunner.java:82)
       [...]
  JUnit Jupiter:TestRunner:dynamicTests():dt1
    MethodSource [className = 'com.mycompany.test.TestRunner', methodName = 'dynamicTests', methodParameterTypes = '']
    => java.lang.reflect.InvocationTargetException
       sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
       sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
       java.lang.reflect.Method.invoke(Method.java:498)
       com.mycompany.test.TestRunner$1.execute(TestRunner.java:96)
       org.junit.jupiter.engine.descriptor.JupiterTestDescriptor. executeAndMaskThrowable (JupiterTestDescriptor.java:141)
       org.junit.jupiter.engine.descriptor.DynamicTestTestDescriptor. execute(DynamicTestTestDescriptor.java:41)
       org.junit.jupiter.engine.descriptor.DynamicTestTestDescriptor. execute(DynamicTestTestDescriptor.java:24)
       org.junit.platform.engine.support.hierarchical. HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$3 (HierarchicalTestExecutor.java:112)
       org.junit.platform.engine.support.hierarchical.SingleTestExecutor. executeSafely(SingleTestExecutor.java:66)
       [...]

对于 t1，断言正确显示为 org.opentest4j.AssertionFailedError: expected: <1> but was: <5> ，但对于 dt1，断言显示 java.lang.reflect.InvocationTargetException 。有人看到同样的问题吗？如何获得 dt1 的预期断言结果为 t1？

Answer 1

检查InitationTargetException的原因。它应该读取如下内容:

Caused by: org.opentest4j.AssertionFailedError: expected: <1> but was: <50>
    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:52)
    at org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
    at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:154)
    at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:149)
    at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:305)
    ...

如果您认为这不是所需的行为，请通过 https://github.com/junit-team/junit5/issues 提交问题

如果将 dt1 中的反射方法调用替换为 Assertions.assertEquals(1, 50);，您将得到 AssertionFailedError 作为预计。