Error“在Junit测试中没有公共TestCase（String name）或TestCase（） [英] Error "has no public TestCase(String name) or TestCase() in Junit test

问题描述

我是junit test android的初学者。我正在关注本教程，但收到此错误

I'm a beginner in junit test android. I'm following this tutorial but get this error

junit.framework.AssertionFailedError: Class com.example.projectfortest.test.MainActivityTest has no public constructor TestCase(String name) or TestCase()
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)

这是我的代码：

public class MainActivityTest extends
        ActivityInstrumentationTestCase2<MainActivity> {

    private MainActivity mMainActivity;
    private TextView mFirstTestText;
    private String expected, actual;

    public MainActivityTest(Class<MainActivity> activityClass) {
        super(activityClass);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();

        mMainActivity = getActivity();
        mFirstTestText = (TextView) mMainActivity.findViewById(R.id.txt1);

        expected = mMainActivity.getString(R.string.txt1_test);
        actual = mFirstTestText.getText().toString();
    }

    public void testPreconditions() {
        assertNotNull("mMainActivity is null", mMainActivity);
        assertNotNull("mFirstTestText is null", mFirstTestText);
    }

    public void testMyFirstTestTextView_labelText() {
        assertEquals(expected, actual);
    }
}

我的代码中没有看到任何错误。请帮助

I didn't see anything wrong in my code. Please help

推荐答案

正如Exception所说，为您的类添加一个默认的构造函数。这是测试框架初始化所必需的。替换构造函数：

As the Exception says add a default Constructor to your Class. This is needed for the initialisation by the testing framework. Replace your constructor:

public MainActivityTest(Class<MainActivity> activityClass) {
    super(activityClass);
}

以下内容：

public MainActivityTest() {
    super(MainActivity.class);
}

此构造函数没有框架所需的参数并显示在代码清单中您的教程：

This constructor has no arguments as needed by the framework and showing in the code listing of your tutorial:

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