JUnitJUnit 异常测试
Posted jiangbo44
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了JUnitJUnit 异常测试相关的知识,希望对你有一定的参考价值。
环境
- JDK 6
- JUnit 4.13
- Spring Tool Suite 4.6.2
- Maven 3.6.3
说明
异常测试在 4.13 之前也有,都有一点缺点,不推荐使用,推荐使用 4.13 之后的 assertThrows。
异常测试示例
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>jiangbo.java.junit</groupId>
<artifactId>11-java-junit-exception</artifactId>
<version>1.0.0</version>
<description>JUnit 异常测试示例</description>
<properties>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Caculator
package jiangbo.java.junit;
public class Caculator {
public static int add(int number1, int number2) {
return number1 + number2;
}
public static int subtract(int number1, int number2) {
return number1 - number2;
}
public static int divide(int number1, int number2) {
return number1 / number2;
}
}
CaculatorTest
package jiangbo.java.junit;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThrows;
import static org.junit.Assert.fail;
import org.junit.Rule;
import org.junit.Test;
import org.junit.function.ThrowingRunnable;
import org.junit.rules.ExpectedException;
public class CaculatorTest {
@SuppressWarnings("deprecation")
@Rule
public ExpectedException thrown = ExpectedException.none();
@Test(expected = ArithmeticException.class)
public void testDivide1() {
System.out.println("testDivide1");
Caculator.divide(1, 0);
}
@Test
public void testDivide2() {
try {
System.out.println("testDivide2");
Caculator.divide(1, 0);
fail("Expected an ArithmeticException to be thrown");
} catch (ArithmeticException e) {
assertEquals(e.getMessage(), "/ by zero");
}
}
@Test
public void testDivide3() {
thrown.expect(ArithmeticException.class);
thrown.expectMessage("/ by zero");
System.out.println("testDivide3");
Caculator.divide(1, 0);
}
@Test
public void testDivide4() {
// 推荐使用这种方式,特别是 JDK 大于等于 8 的时候
ArithmeticException thrown = assertThrows(ArithmeticException.class, new ThrowingRunnable() {
@Override
public void run() throws Throwable {
System.out.println("testDivide2");
Caculator.divide(1, 0);
}
});
// java 8
// ArithmeticException thrown = assertThrows(ArithmeticException.class, () -> Caculator.divide(1, 0));
assertEquals("/ by zero", thrown.getMessage());
}
}
运行
通过运行 CaculatorTest 测试类,控制台输出:
testDivide1
testDivide2
testDivide3
testDivide2
以上是关于JUnitJUnit 异常测试的主要内容,如果未能解决你的问题,请参考以下文章