使用参数化Junit测试获取运行时异常

Question

@RunWith(value=Parameterized.class)
public class TestHashMapParams {

    HashMap dataToTest;
    String cont;
    public void TestHashMapParams(HashMap dataToTest)
    {
        this.dataToTest=cont;
    }


    @Test
    public void hashTest()
    {
        System.out.println(dataToTest.get("Key"));
    }


    @Parameters
    public static Collection giveMe()
    {
        ArrayList<HashMap[]> ab=new ArrayList<HashMap[]>();
        HashMap[] bc1=new HashMap[1];
        HashMap[] bc2=new HashMap[1];

        HashMap a1=new HashMap<>();
        HashMap a2=new HashMap<>();

        //HashMap arr[] = {new HashMap(), new HashMap()};
        ArrayList<HashMap> itrtor1=new ArrayList<HashMap>();
        ArrayList<HashMap> itrtor2=new ArrayList<HashMap>();

        a1.put("Key", "val1");
        a2.put("Key","val2");

        itrtor1.add(a1);
        itrtor2.add(a2);

        bc1=itrtor1.toArray(new HashMap[itrtor1.size()]);
        bc2=itrtor2.toArray(new HashMap[itrtor2.size()]);

        ab.add(bc1);
        ab.add(bc2);

        return ab;
    }
}



java.lang.IllegalArgumentException: wrong number of arguments
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

上面的参数化测试意味着运行两次给出运行时异常！ 虽然它运行了两次，但出现上述异常

这可能会出错？

完整堆栈跟踪

java.lang.IllegalArgumentException: wrong number of arguments
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTestUsingConstructorInjection(Parameterized.java:186)
    at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTest(Parameterized.java:181)
    at org.junit.runners.BlockJUnit4ClassRunner$1.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$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.junit.runners.Suite.runChild(Suite.java:127)
    at org.junit.runners.Suite.runChild(Suite.java:26)
    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.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)

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Answer 1

你似乎有一个带有“testHashMapParams”的类，为了约定，它应该是“TestHashMapParams”。

另外，你有一个

public void testHashMapParams(HashMap cont) 

此方法/函数与“testHashMapParams”类名相同。

如果这不是拼写错误，也许你应该首先重命名/重构类名，然后我们会看看是否会导致问题。

Answer 2

除了更正构造函数之外，您可能还想使用@BeforeClass注释

即

@BeforeClass
public void init(){
    //initialize dataToTest here
}