Java/junit-exception/src/test/java/com/hmkcode/AppTest.java at master · user-git/Java · GitHub

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package com.hmkcode;

import java.util.LinkedList;

import org.junit.Rule;

import org.junit.Test;

import org.junit.rules.ExpectedException;

import org.junit.runner.RunWith;

import org.junit.runners.JUnit4;

import static org.junit.Assert.assertThat;

import static org.junit.Assert.fail;

import static org.hamcrest.CoreMatchers.is;

@RunWith(JUnit4.class)

public class AppTest

{

// ( 1 ) Simple way to test exception

@Test(expected= NullPointerException.class)

public void testNull() {

String str = null;

str.toUpperCase();

}

// ( 2 ) Test by tyr/catch (test exception message)

@Test

public void testExceptionMessage(){

try{

new LinkedList<Object>().get(0);

//if no exception thrown the test will fail with the below message.

fail("Expected an IndexOutOfBoundsException to be thrown");

} catch (IndexOutOfBoundsException anIndexOutOfBoundsException) {

//if no exception message is not the same the test will fail with the below message.

assertThat(anIndexOutOfBoundsException.getMessage(), is("Index: 0, Size: 0"));

}

//( 3 ) Test by @Rule & ExpectedException.expect() | ExpectedException.expectMessage()

@Rule

public ExpectedException thrown = ExpectedException.none();

@Test

public void testExceptionByRule() throws ArithmeticException {

thrown.expect(ArithmeticException.class);

thrown.expectMessage("/ by zero");

double d = 1 / 0;

}

Java/junit-exception/src/test/java/com/hmkcode/AppTest.java at master · user-git/Java · GitHub

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