Android--junit Unit Test

Android--junit Unit Test

Objective

This blog post explains how to use JUnit for unit testing in Android development. First, let's look at what a junit,junit test is a white-box test, which is primarily the programmer's own functional testing of the developed method. JUnit is a set of frameworks that are also used in Android.

Junit

Using JUnit testing in Android is roughly divided into the following steps:

1. Increase support for junit in Androidmanifest.xml and develop a test project package.
2. Add a <uses-library...> node to the <application.../> node in Androidmanifest.xml, and the Name property is Android.test.runner.
3. After you write the method that you want to test, create a new class that inherits Androidtestcase, where you write the test case code.
4. Left mouse button on the test case method, Run as→android JUnit test.

Here are a few steps to explain in detail, create a new Android project, and in Androidmanifest.xml, add a instrumentation:

Specify the name and Targetpackage of the instrumentation:

Add <uses-library android:name= "Android.test.runner" to the <application.../> node/>

After the completion of the Androidmanifest.xml code is as follows:

1<?XML version= "1.0" encoding= "Utf-8"?>2<ManifestXmlns:android= "Http://schemas.android.com/apk/res/android"3Package= "Com.example.junittestdemo"4Android:versioncode= "1"5Android:versionname= "1.0">67<Uses-sdk8Android:minsdkversion= "8"9Android:targetsdkversion= "17"/>1011<Instrumentation12Android:name= "Android.test.InstrumentationTestRunner"13Android:targetpackage= "Com.example.junittestdemo">14</Instrumentation>1516<Application17Android:allowbackup= "true"18Android:icon= "@drawable/ic_launcher"19Android:label= "@string/app_name"20Android:theme= "@style/apptheme">21st<Uses-libraryAndroid:name= "Android.test.runner"/>2223<Activity24Android:name= "Com.example.junittestdemo.MainActivity"25Android:label= "@string/app_name">26<Intent-filter>27<ActionAndroid:name= "Android.intent.action.MAIN"/>2829<category android: Name= "Android.intent.category.LAUNCHER" />30 </intent-filter >31 </activity>32 </ application>33 Span style= "color: #008080;" >34 </manifest>  

Write a simple percentage of progress calculation method:

1PackageCom.example.service;23PublicClass Progressservice { 4  Progressservice () { 5 } 7 public Integer Getcurrentprogerss (double Current,  Max" { 8 Integer i= ( int) ((Current/max) * 100 9 return I;10 }11}       

Write a test class that needs to inherit androidtestcase and test for the percent method:

1PackageCom.example.junit;23ImportAndroid.test.AndroidTestCase;4ImportAndroid.util.Log;567ImportCom.example.service.ProgressService;89PublicClass ProgressservicejunitExtendsAndroidtestcase {10PrivateFinal String tag= "main";1112PublicProgressservicejunit () {13 // TODO Auto-generated constructor Stub}15 16 public void Getcurrentprogersstest () {17 progressservice progressservice=new Progressservice ();  LOG.I (TAG, pro.tostring ());  }21}       

Left-click Getcurrentprogersstest () method, select Android JUnit Test and, if you need to debug, select the Android junit test under Debug as:

When the execution succeeds, the green is displayed, and if it is a different color, an error occurs:

You can see the test results in the Logcat log:

Android--junit Unit Test