java – Espresso 2.0 – 在扩展junit3 testcase的类中使用@Test注释的方法

当使用Espresso 2.0附带的新ActivityInstrumentationTestCase2类时,我得到了一个奇怪的警告方法,使用@Test内部类扩展junit3 testcase.

我的课程看起来就像谷歌提供的那样：

import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;
import android.test.ActivityInstrumentationTestCase2;
import android.test.suitebuilder.annotation.LargeTest;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.matcher.ViewMatchers.assertThat;
import static org.hamcrest.Matchers.notNullValue;

@RunWith(AndroidJUnit4.class)
@LargeTest
public class MyCoolActivityTests extends ActivityInstrumentationTestCase2<MyCoolActivity> {

    private MyCoolActivity mActivity;

    public MyCoolActivityTests() {
        super(MyCoolActivity.class);
    }

    @Before
    public void setUp() throws Exception {
        super.setUp();
        injectInstrumentation(InstrumentationRegistry.getInstrumentation());
        mActivity = getActivity();
    }

    @Test
    public void checkPreconditions() {
        assertThat(mActivity,notNullValue());
        // Check that Instrumentation was correctly injected in setUp()
        assertThat(getInstrumentation(),notNullValue());
    }

    @After
    public void tearDown() throws Exception {
        super.tearDown();
    }
}

我已经为build.gradle添加了所有必要的东西：

android {
    defaultConfig {
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
}

dependencies {
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.0'
    androidTestCompile 'com.android.support.test:testing-support-lib:0.1'
}

有没有办法让这个警告消失？

解决方法

@Test annotation is a replacement for the test-prefix naming convention used in JUnit 3. JUnit 4 test classes no longer require to extend TestCase or any of its subclasses. In fact JUnit 4 tests cannot extend TestCase,otherwise AndroidJUnitRunner will treat them as JUnit 3 tests.

http://developer.android.com/tools/testing-support-library/index.html#AndroidJUnitRunner

您可以迁移到由com.android.support.test提供的ActivityTestRule：规则：0.4(或更高版本),或坚持使用JUnit 3.

另一个选项是InstrumentationRegistry,由Espresso 2提供,它有getInstrumentation(),getContext(),getTargetContext()(以及更多).这些方法以静态方式提供对当前检测,测试上下文和目标上下文的访问.这使得编写自己的静态实用程序方法成为可能,以便在JUnit 4测试用例类中使用.这些实用程序将模仿当前仅在基本JUnit 3测试用例类中可用的功能. (这不再是必要的.)

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