老李分享：Robotium编写测试用例如何模拟Junit4的BeforeClass和AfterClass方法1 - 条件判断法

老李分享：Robotium编写测试用例如何模拟Junit4的BeforeClass和AfterClass方法1 - 条件判断法

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Robotium的测试类ActivityInstrumentationTestCase2是继承于Junit3的TestCase类，所以并没有提供Junit4的特性.如网上总结说的

• 不能通过annotate的方式来识别子类的新特征，如不能实现@beforeclass，@afterclass等特征。只能通过写setup和teardown，
• TestCase只能以test开头进行测试case书写。

那么有时我们并不想每次开始/完成一个case的时候都做一些重复的动作，也就是要实现Junit4的@beforeclass和@afterclass，该怎么办呢？

以SDK自带的Notepad测试用例作为例子，假如现在我们需要实现两个测试用例

• testAddNoteCNTittle:创建一个中文标题的笔记
• testAddNoteEngTitle:创建一个英文标题的笔记

根据实例提供的代码，在setup里面会初始化solo而在teardown里面会关闭所有打开的activities，也就是说每执行一个case都会重新初始化一次solo和关闭所有的activities：

@Override

public void setUp() throws Exception {

//setUp() is run before a test case is started.

//This is where the solo object is created.

super.setUp();

this.activity = this.getActivity();

this.solo = new Solo(getInstrumentation(), getActivity());

}

@Override

public void tearDown() throws Exception {

//tearDown() is run after a test case has finished.

//finishOpenedActivities() will finish all the activities that have been opened during the test execution.

solo.finishOpenedActivities();

}

但事实上我们在这个脚本只是去创建两个Note，并不需要每执行完一个case都要去初始化solo和关闭所有activities。google后没有发现有现成的取代@beforeclass和@aferclass的方法。

以下本人的实现方法

<pre name="code" class="java">package com.example.android.notepad.test;

import com.robotium.solo.Solo;

import android.test.ActivityInstrumentationTestCase2;

import android.app.Activity;

@SuppressWarnings("rawtypes")

public class TCCreateNote extends ActivityInstrumentationTestCase2{

private static Solo solo = null;

public Activity activity;

<span style="white-space:pre">     </span>private static final int NUMBER_TOTAL_CASES = 2;

private static int run = 0;

private static Class<?> launchActivityClass;

//对应re-sign.jar生成出来的信息框里的两个值

private static String mainActiviy = "com.example.android.notepad.NotesList";

private static String packageName = "com.example.android.notepad";

static {

try {

launchActivityClass = Class.forName(mainActiviy);

} catch (ClassNotFoundException e) {

throw new RuntimeException(e);

}

}

@SuppressWarnings("unchecked")

public TCCreateNote() {

super(packageName, launchActivityClass);

}

@Override

public void setUp() throws Exception {

//setUp() is run before a test case is started.

//This is where the solo object is created.

super.setUp();

<span style="white-space:pre">              </span>//The variable solo has to be static, since every time after a case's finished, this class TCCreateNote would be re-instantiated

// which would lead to soto to re-instantiated to be null if it's not set as static

if(solo == null) {

TCCreateNote.solo = new Solo(getInstrumentation(), getActivity());

}

}

@Override

public void tearDown() throws Exception {

//Check whether it's the last case executed.

run += countTestCases();

if(run >= NUMBER_TOTAL_CASES) {

solo.finishOpenedActivities();

}

}

public void testAddNoteCNTitle() throws Exception {

solo.clickOnMenuItem("Add note");

solo.enterText(0, "中文标签笔记");

solo.clickOnMenuItem("Save");

solo.clickInList(0);

solo.clearEditText(0);

solo.enterText(0, "Text 1");

solo.clickOnMenuItem("Save");

solo.assertCurrentActivity("Expected NotesList Activity", "NotesList");

solo.clickLongOnText("中文标签笔记");

solo.clickOnText("Delete");

}

public void testAddNoteEngTitle() throws Exception {

solo.clickOnMenuItem("Add note");

solo.enterText(0, "English Title Note");

solo.clickOnMenuItem("Save");

solo.clickInList(0);

solo.clearEditText(0);

solo.enterText(0, "Text 1");

solo.clickOnMenuItem("Save");

solo.assertCurrentActivity("Expected NotesList Activity", "NotesList");

solo.clickLongOnText("English Title Note");

solo.clickOnText("Delete");

}

}