在Eclipse中应用JUnit4进行单元测试（高级篇）

在Eclipse中使用JUnit4进行单元测试（高级篇）

???? public ? void ?squareRoot( int ?n)? ... {

???????? for ?(;?;)?;????????????????? // Bug?:?死循环

????}

????@Test(timeout? = ? 1000 )

???? public ? void ?squareRoot()? ... {

????????calculator.squareRoot( 4 );

????????assertEquals( 2 ,?calculator.getResult());

?

????}

??@Test(expected? = ?ArithmeticException. class )

?? public ? void ?divideByZero()? ... {

calculator.divide( 0 );?

??}

如上述代码所示，我们需要使用@Test标注的expected属性，将我们要检验的异常传递给他，这样JUnit框架就能自动帮我们检测是否抛出了我们指定的异常。

import ?org.junit.internal.runners.TestClassRunner;

import ?org.junit.runner.RunWith;

?

// 使用了系统默认的TestClassRunner，与下面代码完全一样

public ? class ?CalculatorTest? ... {

...

}

?

?

@RunWith(TestClassRunner. class )

public ? class ?CalculatorTest? ... {

...

}

import ?org.junit.AfterClass;

import ?org.junit.Before;

import ?org.junit.BeforeClass;

import ?org.junit.Test;

import ? static ?org.junit.Assert. * ;

?

public ? class ?AdvancedTest? ... {

?

private ? static ?Calculator?calculator?＝? new ?Calculator();

?

????@Before

public ? void ?clearCalculator()? ... {

????????calculator.clear();

????}

?

????@Test

???? public ? void ?square1()? ... {

????????calculator.square( 2 );

????????assertEquals( 4 ,?calculator.getResult());

????}

?

????@Test

???? public ? void ?square2()? ... {

????????calculator.square( 0 );

????????assertEquals( 0 ,?calculator.getResult());

????}

?

????@Test

???? public ? void ?square3()? ... {

????????calculator.square( - 3 );

????????assertEquals( 9 ,?calculator.getResult());

????}

?

}

import ? static ?org.junit.Assert.assertEquals;

import ?org.junit.Test;

import ?org.junit.runner.RunWith;

import ?org.junit.runners.Parameterized;

import ?org.junit.runners.Parameterized.Parameters;

?

import ?java.util.Arrays;

import ?java.util.Collection;

?

@RunWith(Parameterized. class )

public ? class ?SquareTest? ... {

?

???? private ? static ?Calculator?calculator? = ? new ?Calculator();

???? private ? int ?param;

???? private ? int ?result;

?

????@Parameters

???? public ? static ?Collection?data()? ... {

???????? return ?Arrays.asList( new ?Object[][] ... {

???????????????? ... { 2 ,? 4 } ,

???????????????? ... { 0 ,? 0 } ,

???????????????? ... {－ 3 ,? 9 } ,

????????} );

????}

?

?

// 构造函数，对变量进行初始化

???? public ?SquareTest( int ?param,? int ?result)? ... {

???????? this .param? = ?param;

???????? this .result? = ?result;

????}

?

????@Test

???? public ? void ?square()? ... {

????????calculator.square(param);

????????assertEquals(result,?calculator.getResult());

????}

?

}

import ?org.junit.runner.RunWith;
import ?org.junit.runners.Suite;

@RunWith(Suite. class )
@Suite.SuiteClasses( ... {
????????CalculatorTest. class ,
????????SquareTest. class
????????} )
public ? class ?AllCalculatorTests? ... {
}