为 Java 中的自定义检查异常编写 JUnit 测试用例？
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原文地址: http://stackoverflow.com/questions/20336657/
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writing a JUnit Test case for custom checked exception in Java?
提问by brain storm
I am writing a test case for my class that has methods which throw exceptions (both checked and runtime). I have tried different possible ways of testing as suggested in this link.. It appears they seem to work only for runtime exceptions. for Checked exceptions, I need to do a try/catch/assert as shown in the code below. Is there any alternatives to try/catch/assert/. you will notice that testmethod2() and testmethod2_1()shows compile error but testmethod2_2()does not show compile error which uses try/catch.
我正在为我的类编写一个测试用例，其中包含抛出异常（检查和运行时）的方法。我已经按照此链接中的建议尝试了不同的可能测试方法。. 看起来它们似乎只适用于运行时异常。对于已检查的异常，我需要执行 try/catch/assert，如下面的代码所示。是否有任何替代 try/catch/assert/. 您会注意到testmethod2() and testmethod2_1()显示编译错误但testmethod2_2()不显示使用 try/catch 的编译错误。
class MyException extends Exception {
public MyException(String message){
super(message);
}
}
public class UsualStuff {
public void method1(int i) throws IllegalArgumentException{
if (i<0)
throw new IllegalArgumentException("value cannot be negative");
System.out.println("The positive value is " + i );
}
public void method2(int i) throws MyException {
if (i<10)
throw new MyException("value is less than 10");
System.out.println("The value is "+ i);
}
}
Test class:
测试类：
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
public class UsualStuffTest {
private UsualStuff u;
@Before
public void setUp() throws Exception {
u = new UsualStuff();
}
@Rule
public ExpectedException exception = ExpectedException.none();
@Test(expected = IllegalArgumentException.class)
public void testMethod1() {
u.method1(-1);
}
@Test(expected = MyException.class)
public void testMethod2() {
u.method2(9);
}
@Test
public void testMethod2_1(){
exception.expect(MyException.class);
u.method2(3);
}
public void testMethod2_3(){
try {
u.method2(5);
} catch (MyException e) {
assertEquals(e.getMessage(), "value is less than 10") ;
}
}
}
采纳答案by jtahlborn
@Test(expected = MyException.class)
public void testMethod2() throws MyException {
u.method2(9);
}
