使用数组参数的参数化 JUnit 测试中的反射异常

Question

我试图在 JUnit 4.11 中设置一个参数化测试，它生成一个单个参数。但是，此参数本身需要是一个数组。

以下代码片段的预期行为是 test() 是运行两次，而 arguments 在第一个运行中包含一个数组 {"test1", "test2"}和第二个数组 {"test3", "test4"} 运行.

@RunWith(Parameterized.class)
public class Tester {

    @Parameter
    private String[] arguments;

    @Parameters
    public static Iterable<Object[]> data() {
        return Arrays.asList(
                new Object[][]{
                    {new String[] {"test1","test2"}},
                    {new String[] {"test3","test4"}}
                }
        );  
    }

    @Test
    public void test() {
        fail();
    }
}

但是，当我执行测试时，抛出了 SlowCheckMemberAccess 异常。 Google 没有针对此类问题提供任何结果。

谁能解释这里出了什么问题？

未经过滤的 JUnit 跟踪是：

java.lang.IllegalAccessException: Class org.junit.runners.Parameterized$TestClassRunnerForParameters can not access a member of class org.mafagafogigante.dungeon.entity.creatures.Tester with modifiers "private"
at sun.reflect.Reflection.ensureMemberAccess(Unknown Source)
at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(Unknown Source)
at java.lang.reflect.AccessibleObject.checkAccess(Unknown Source)
at java.lang.reflect.Field.set(Unknown Source)
at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTestUsingFieldInjection(Parameterized.java:201)
at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTest(Parameterized.java:179)
at org.junit.runners.BlockJUnit4ClassRunner.runReflectiveCall(BlockJUnit4ClassRunner.java:244)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:241)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access[=11=]0(ParentRunner.java:53)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runners.Suite.runChild(Suite.java:127)
at org.junit.runners.Suite.runChild(Suite.java:26)
at org.junit.runners.ParentRunner.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access[=11=]0(ParentRunner.java:53)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
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:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Answer 1

我认为您不需要 Arrays.asList()，因为数组也是 Iterable。

如果你给它指定一个数组参数，Arrays.asList()也会被愚弄。如果要使用它，请添加显式转换。

Answer 2

用@Parameter注释的字段必须是public。

JUnit 4.13 will have an improved error message:

Cannot set parameter 'arguments'. Ensure that the field 'arguments' is public.

使用数组参数的参数化 JUnit 测试中的反射异常

Reflection Exception in parameterized JUnit test using array parameter

java

reflection

junit

exception

parameterized