JUNIT4 Test exception

In some cases, we conclude that the target method throws an exception and how to handle it.

Using JUnit tests to throw exceptions, I summed up 3 ways to see the code:

Import static org.junit.assert.fail;import org.junit.rule;import org.junit.test;import  org.junit.rules.ExpectedException;/** *  test anomalies  *  *  @author  WEI.SS  *  */public class ExceptionTest {//  rule annotations, added on the public property, and attributes are implemented directly or indirectly org.junit.rules.testrule@rulepublic expectedexception expectedexception =  Expectedexception.none ();//  common Practice @testpublic void test1 ()  {try {//  impersonation throws exception if   ("AAA". Equals ("AAA")  {//  if no exception is thrown, the test will not pass throw new runtimeexception ();}   Normally, the code should not be executed here to fail ("Normally, the code should not be executed here");}  catch  (exception e)  {}}//  Specifies the exception @test (expected = ) that is expected to be thrown by using the properties of the annotation @test expected Runtimeexception.class) Public void test2 ()  {//  If no exception is thrown, the test will not pass through the throw new  RuntimeException ();} @Testpublic  void test3 ()  {//  expect to throw RuntimeException exception Expectedexception.expect ( RuntimeexceptIon.class);//  If no exception is thrown, the test will not pass throw new runtimeexception ();}} 

JUNIT4 Test exception