【Android】JUnit和Espresso单元测试新手快速入门-Toy模板网

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引入依赖


	android {
	    defaultConfig {
	        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
	    }
	}
	
	dependencies {
	    testImplementation 'junit:junit:4.13.2'
	    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
	    androidTestImplementation 'androidx.test:rules:1.1.0'
	    androidTestImplementation 'androidx.test:runner:1.1.0'
	    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
	}

Java代码测试


	package com.android.myapplication;
	
	import org.junit.Test;
	
	import static org.junit.Assert.*;
	
	public class ExampleUnitTest {
	
	    @Test
	    public void addition_isCorrect() {
	        assertEquals(4, 2 + 2);
	    }
	}

点击被Test标注的方法，左侧的运行按钮，就可以执行测试任务

AndroidUI测试


	package com.android.myapplication;
	
	import static androidx.test.espresso.Espresso.onView;
	import static androidx.test.espresso.action.ViewActions.click;
	import static androidx.test.espresso.matcher.ViewMatchers.withId;
	
	import android.content.Context;
	
	import androidx.test.platform.app.InstrumentationRegistry;
	import androidx.test.ext.junit.runners.AndroidJUnit4;
	import androidx.test.rule.ActivityTestRule;
	
	import org.junit.Assert;
	import org.junit.Rule;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	
	@RunWith(AndroidJUnit4.class)
	public class ExampleInstrumentedTest {
	
	    @Rule
	    public ActivityTestRule<MainActivity> activityTestRule = new ActivityTestRule(MainActivity.class, true);
	
	    @Test
	    public void useAppContext() {
	        //验证包名是否正确
	        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
	        Assert.assertEquals("com.android.myapplication", appContext.getPackageName());
	        //模拟点击事件
	        onView(withId(R.id.fab)).perform(click());
	        //启动Activity
	        activityTestRule.getActivity();
	    }
	}