运行 Android 仪器测试时出错 "No tests found"

Question

我是测试的初学者。我在 android studio 中为登录 activity 创建了一个简单的测试用例。但是我得到一个错误，我无法解决它。这是我的测试代码。非常感谢您的帮助。

package com.example.hassidiczaddic.testinglist;

import android.app.Application;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;
import android.test.ActivityInstrumentationTestCase2;
import android.test.ApplicationTestCase;
import android.test.suitebuilder.annotation.LargeTest;

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

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.closeSoftKeyboard;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

@RunWith(AndroidJUnit4.class)
@LargeTest
public class ApplicationTest {

    public static final String STRING_TO_BE_TYPED = "Wolfmatrix";

    @Rule
    public ActivityTestRule<MainActivity> mActivityRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void LoginActivity() {
        onView(withId(R.id.etFName))
                .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard());
        onView(withId(R.id.etLName))
                .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard());
        onView(withId(R.id.btnSubmit))
            .perform(click());
        onView(withId(R.id.tvView))
            .check(matches(withText(STRING_TO_BE_TYPED)));
    }

}

这是我的错误：

Running tests

$ adb shell am instrument -w -r   -e debug false -e class       
com.example.hassidiczaddic.testinglist.ApplicationTest
com.example.hassidiczaddic.testinglist.
test/android.test.InstrumentationTestRunner
Client not ready yet..Test running started
junit.framework.AssertionFailedError: No tests found in     
com.example.hassidiczaddic.testinglist.ApplicationTest
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at    
android.test.InstrumentationTestRunner.onStart
(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run
(Instrumentation.java:1619)
Tests ran to completion.

这是我的 gradle 文件：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.hassidiczaddic.testinglist"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),'proguard-rules.pro'
        }
    }

    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        testCompile 'junit:junit:4.12'
        compile 'com.android.support:appcompat-v7:23.0.1'
        // App dependencies
        compile 'com.android.support:support-annotations:23.0.1'
        compile 'com.google.guava:guava:18.0'
        androidTestCompile 'com.android.support:support-annotations:23.0.1'
        androidTestCompile 'com.android.support.test:runner:0.4.1'
        androidTestCompile 'com.android.support.test:rules:0.4.1'
        androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
    }
}

Answer 1

您忘记将 AndroidJUnitRunner 设置为默认测试仪器运行器。

https://developer.android.com/topic/libraries/testing-support-library/index.html

要将 AndroidJUnitRunner 设置为您的 Gradle 项目中的默认测试检测运行器，请在您的 build.gradle 文件中指定此依赖项：

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

更新

和androidx有些变化，查看https://developer.android.com/training/testing/set-up-project

Answer 2

如果您的目标是 SDK 版本 28，您将使用支持库中重新打包的 androidx 类，因此 AndroidJUnitRunner 是像这样配置...

android {
    defaultConfig {
        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
    }
}

Answer 3

检查build.gradle

replace testInstrumentationRunner "androidx.test.runner.AndroidJUnit4"

android {
    defaultConfig {
        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
    }
}

寻找app/src/androidTest/AndroidManifest.xml

将 android:name 更改为 androidx.multidex.MultiDexApplication

<application
        android:allowBackup="true"
        android:label="Components Tests App"
        android:supportsRtl="true"
        android:name="android.support.multidex.MultiDexApplication">

至

<application
            android:allowBackup="true"
            android:label="Components Tests App"
            android:supportsRtl="true"
            android:name="androidx.multidex.MultiDexApplication">

更多建议：

Answer 4

如果您通过从方法生成测试到达此处...尝试将测试中的测试方法重命名 class.. 类似于将 actualMethod() 重命名为 testActualMethod()

Answer 5

勾选 logcat!

发生这种情况的原因有很多，构建日志并不总是那么有用，即使使用 --stracktrace --info 或 --debug 标志也是如此。

就我而言，这是由于缺少运行时依赖项。我是在检查 logcat 并看到那里的错误后才弄明白的。

如果您已经检查了其他答案中提到的所有显而易见的事情，但您仍然遇到这个问题，检查 logcat 是否有错误 .

运行 Android 仪器测试时出错 "No tests found"

Error "No tests found" when running Android instrumentation tests

android

junit4

android-studio

android-espresso

检查build.gradle