Android Dev Unit Test (i)

Android Dev Unit Test (i)

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http://blog.csdn.net/fengyuzhengfan/article/details/40209995

In real-world development, the process of developing Android software needs to be constantly tested. Android unit Testing is a must-have step for regular Android development. Unit tests can be embedded in a project, or they can be tested for a specific project as a separate project.

1. Hierarchy of Android Unit test framework

It can be seen from:

The test methods in 1.android are mainly androidtestcase and instrumentationtextcase. So what is instrumentation?

Instrumentation and activity are a bit similar, except that the activity needs an interface, and instrumentation is not, we can understand it as a non-graphical interface, with the ability to boot, to monitor other classes ( The tool class declared with the target package.

2. The Android test class enables testing of important components in Android (such as Activity,service,contentprovider and application).

2. Steps for Android Unit testing

Here I write a simple test class Mathutil There is only one test method in this class sum used to calculate the sum of two integers.   

Package com.jph.simpleapp;/** * Tested class * @author JPH * date:2014.10.18 */public class Mathutil {public Mathutil () {//TODO A uto-generated constructor stub}public int sum (int a,int b) {return a+b;}}

Tips: the method being measured must be declared as Public , otherwise it cannot be accessed.

The following are the main steps to start creating a test project:

First step: Create a test project

To create an Android test project, in the Popup box, select Android test

Select the project you want to test, and then click Finish Finish can be.

at this point, Android The test project has been created, so let's take a look at the project manifest file,

as can be seen, Android Test engineering than normal Android more projects. <instrumentation/> Labels and < uses-library android:name="Android.test.runner"/>.

which Targetpackage represents the tested Android the package name of the project.

Step Two: Create a test class

Here you choose to inherit androidtestcase.

Test code:

Package Com.jph.simpleapp.test;import com.jph.simpleapp.mathutil;import android.test.androidtestcase;/** * Test class * @ Author JPH * date:2014.10.18 */public class Mathutiltest extends Androidtestcase {mathutil mutil;/** * The first method to be executed, which can be entered in this method Line some initialization operation * @see Android.test.androidtestcase#setup () */@Overrideprotected void SetUp () throws Exception {//TODO Auto-gen Erated method Stubmutil=new Mathutil (); Super.setup ();} public void Testsum () {int result=mutil.sum (2, 1); Assertequals (3, result); SYSTEM.OUT.PRINTLN ("Result:" +result);} /** * Last executed method, here are some finishing touches * @see Android.test.androidtestcase#teardown () */@Overrideprotected void TearDown () throws Exception {//TODO auto-generated method Stubsuper.teardown ();}}

 

Code Analysis:

SetUp (): The first method to be executed, which can be initialized in this method

TearDown (): The last method to be executed, where some finishing touches are done

Testsum (): is the method to test sum .

at this point, the test class has been written to completion. Start the Android unit test below.

Step Three: Conduct unit tests

We can either run a test method or all of the methods according to the required option, step

Operation Result:

Results Analysis:

as you can see, the result of the run is a failure because sum returned by 3 , but we expect it to return the 4 .

below we will change our expectations to 3 :

This is expected and the result is the same, run through. We pass the past 1 and 2 to add, the return result is 3, so the sum method is proved correct.

not to be continued ... .....

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Android Dev Unit Test (i)