我收到错误“没有注册仪器！必须在注册仪器下运行“

Question

当我尝试运行SignUpFragmentTest类时，我收到错误“没有注册仪器！必须在注册检测下运行”。我认为当我使用@Rule时会引发误解。

import android.support.test.runner.AndroidJUnit4;
import android.support.v4.app.Fragment;
import android.widget.FrameLayout;



import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import androidx.test.rule.ActivityTestRule;
import static junit.framework.Assert.assertNotNull;



@RunWith(AndroidJUnit4.class)

public class SignUpFragmentTest {

    @Rule public final ActivityTestRule<LoginActivity> main = new ActivityTestRule<>(LoginActivity.class);

    private LoginActivity mActivity = null;



    @Before
    public void setUp() throws Exception {
    mActivity =main.getActivity();
    }
    @Test
    public void testLaunchSingUpScreen(){
        FrameLayout frameLayout = mActivity.findViewById(R.id.fragment_container);
        assertNotNull(frameLayout);
        Fragment fragment = new SignUpFragment();
        mActivity.getSupportFragmentManager().beginTransaction().add(frameLayout.getId(),fragment).commitAllowingStateLoss();

    }
    @After
    public void tearDown() throws Exception {
        mActivity= null;
    }
}

我添加依赖项：

androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test:rules:1.1.1'

和

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

到defaultConfig

Answer 1

对我有用的是完全改变所有库

androidX

至

com.android.support

build.gradle中的库

请注意：您可能需要重新导入库以测试您的课程，例如：

import androidx.test.runner.AndroidJUnitRunner;

至

import android.support.test.runner.AndroidJUnitRunner;

还要确保在build.gradle中的每个添加或删除库之后始终清理并重建项目。