Robotium:测试运行未能完成。预期 N 次测试，已收到 (N-1)

Question

Android 测试仍然是我头疼的问题。我创建了最简单的应用程序只是为了弄清楚 Robotium 的工作原理，每次测试失败时都会出现错误:

Running tests
Test running started
Test failed to run to completion. Reason: 'Test run failed to complete. Expected 1 tests, received 0'. Check device logcat for details
Test running failed: Test run failed to complete. Expected 1 tests, received 0

有一次我“预期进行 3 次测试，但收到了 2 次”。满足使用无参数构造函数的条件。如何解决这个问题？

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final EditText editText = (EditText)findViewById(R.id.input);

        final TextView textView = (TextView)findViewById(R.id.output);
        Button button = (Button) findViewById(R.id.enter);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                textView.setText(String.valueOf(editText.getText()));
            }
        });
    }
}

MainActivityTest.java

@SuppressWarnings("unchecked")
public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {

    private Solo solo;

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

    public void testRun() throws Throwable {
        super.runTest();
        solo = new Solo(getInstrumentation(), getActivity());
        solo.waitForActivity(MainActivity.class);
        solo.assertCurrentActivity("error", MainActivity.class);
        solo.typeText((EditText) solo.getView(R.id.input), "alice");
        solo.clickOnView(solo.getView(R.id.enter));
        assertNotEquals("cooper", ((TextView) solo.getView(R.id.output)).getText());
        assertEquals("alice", ((TextView) solo.getView(R.id.output)).getText());
    }
}

此默认测试是绿色的:

    public class ApplicationTest extends ApplicationTestCase<Application> {
    public ApplicationTest() {
        super(Application.class);
    }
}

Answer 1

我建议从 testRun() 方法中删除以下几行

super.runTest();
solo = new Solo(getInstrumentation(), getActivity());

改为添加以下方法

public void setUp() throws Exception {
        solo = new Solo(getInstrumentation(), getActivity());
    }

另外请添加tearDown方法

@Override
public void tearDown() throws Exception {
    solo.finishOpenedActivities();
}