{"id":107734,"date":"2020-11-27T10:00:00","date_gmt":"2020-11-27T08:00:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=107734"},"modified":"2020-11-25T14:06:31","modified_gmt":"2020-11-25T12:06:31","slug":"testing-expected-exceptions-with-junit-5","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/11\/testing-expected-exceptions-with-junit-5.html","title":{"rendered":"Testing Expected Exceptions with JUnit 5"},"content":{"rendered":"<p>This post shows how to test for expected exceptions using <a href=\"https:\/\/junit.org\/junit5\/\">JUnit 5<\/a>. If you&#8217;re still on JUnit 4, please check out my <a href=\"http:\/\/fahdshariff.blogspot.com\/2012\/09\/testing-expected-exceptions-with-junit.html\">previous post<\/a>.<\/p>\n<p>Let&#8217;s start with the following class that we wish to test:<\/p>\n<div>\n<div id=\"highlighter_661805\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java keyword\">public<\/code> <code class=\"java keyword\">class<\/code> <code class=\"java plain\">Person {<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">private<\/code> <code class=\"java keyword\">final<\/code> <code class=\"java plain\">String name;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">private<\/code> <code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code> <code class=\"java plain\">age;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java preprocessor\">\/**<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">* Creates a person with the specified name and age.<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">*<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">* @param name the name<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">* @param age the age<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">* @throws IllegalArgumentException if the age is not greater than zero<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0<\/code><code class=\"java preprocessor\">*\/<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">public<\/code> <code class=\"java plain\">Person(String name, <\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">age) {<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.name = name;<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.age = age;<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(age &lt;= <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">) {<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">throw<\/code> <code class=\"java keyword\">new<\/code> <code class=\"java plain\">IllegalArgumentException(<\/code><code class=\"java string\">\"Invalid age:\"<\/code> <code class=\"java plain\">+ age);<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>To test that an <code>IllegalArgumentException<\/code> is thrown if the age of the person is less than zero, you should use JUnit 5&#8217;s <a href=\"https:\/\/junit.org\/junit5\/docs\/5.4.0\/api\/org\/junit\/jupiter\/api\/Assertions.html#assertThrows(java.lang.Class,org.junit.jupiter.api.function.Executable)\"><code>assertThrows<\/code><\/a> as shown below:<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<div>\n<div id=\"highlighter_102593\" class=\"syntaxhighlighter  java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">01<\/div>\n<div class=\"line number2 index1 alt1\">02<\/div>\n<div class=\"line number3 index2 alt2\">03<\/div>\n<div class=\"line number4 index3 alt1\">04<\/div>\n<div class=\"line number5 index4 alt2\">05<\/div>\n<div class=\"line number6 index5 alt1\">06<\/div>\n<div class=\"line number7 index6 alt2\">07<\/div>\n<div class=\"line number8 index7 alt1\">08<\/div>\n<div class=\"line number9 index8 alt2\">09<\/div>\n<div class=\"line number10 index9 alt1\">10<\/div>\n<div class=\"line number11 index10 alt2\">11<\/div>\n<div class=\"line number12 index11 alt1\">12<\/div>\n<div class=\"line number13 index12 alt2\">13<\/div>\n<div class=\"line number14 index13 alt1\">14<\/div>\n<div class=\"line number15 index14 alt2\">15<\/div>\n<div class=\"line number16 index15 alt1\">16<\/div>\n<div class=\"line number17 index16 alt2\">17<\/div>\n<div class=\"line number18 index17 alt1\">18<\/div>\n<div class=\"line number19 index18 alt2\">19<\/div>\n<div class=\"line number20 index19 alt1\">20<\/div>\n<div class=\"line number21 index20 alt2\">21<\/div>\n<div class=\"line number22 index21 alt1\">22<\/div>\n<div class=\"line number23 index22 alt2\">23<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java keyword\">static<\/code> <code class=\"java plain\">org.hamcrest.CoreMatchers.*;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java keyword\">import<\/code> <code class=\"java keyword\">static<\/code> <code class=\"java plain\">org.hamcrest.MatcherAssert.*;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java keyword\">static<\/code> <code class=\"java plain\">org.junit.jupiter.api.Assertions.*;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java keyword\">import<\/code> <code class=\"java plain\">org.junit.jupiter.api.Test;<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java keyword\">class<\/code> <code class=\"java plain\">PersonTest {<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java color1\">@Test<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testExpectedException() {<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">assertThrows(IllegalArgumentException.<\/code><code class=\"java keyword\">class<\/code><code class=\"java plain\">, () -&gt; {<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">new<\/code> <code class=\"java plain\">Person(<\/code><code class=\"java string\">\"Joe\"<\/code><code class=\"java plain\">, -<\/code><code class=\"java value\">1<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">});<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java color1\">@Test<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testExpectedExceptionMessage() {<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">Exception e = assertThrows(IllegalArgumentException.<\/code><code class=\"java keyword\">class<\/code><code class=\"java plain\">, () -&gt; {<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">new<\/code> <code class=\"java plain\">Person(<\/code><code class=\"java string\">\"Joe\"<\/code><code class=\"java plain\">, -<\/code><code class=\"java value\">1<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">});<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(e.getMessage(), containsString(<\/code><code class=\"java string\">\"Invalid age\"<\/code><code class=\"java plain\">));<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p><b><span>Related post: <\/span><\/b><a href=\"http:\/\/fahdshariff.blogspot.com\/2012\/09\/testing-expected-exceptions-with-junit.html\">Testing Expected Exceptions with JUnit 4 Rules<\/a><\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on Java Code Geeks with permission by Fahd Shariff, partner at our <a href=\"\/\/www.javacodegeeks.com\/join-us\/jcg\/\" target=\"_blank\" rel=\"noopener noreferrer\">JCG program<\/a>. See the original article here: <a href=\"http:\/\/fahdshariff.blogspot.com\/2020\/11\/testing-expected-exceptions-with-junit-5.html\" target=\"_blank\" rel=\"noopener noreferrer\">Testing Expected Exceptions with JUnit 5<\/a><\/p>\n<p>Opinions expressed by Java Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This post shows how to test for expected exceptions using JUnit 5. If you&#8217;re still on JUnit 4, please check out my previous post. Let&#8217;s start with the following class that we wish to test: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 public &hellip;<\/p>\n","protected":false},"author":356,"featured_media":176,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[274,1936,273],"class_list":["post-107734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-junit","tag-junit-5","tag-testing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Testing Expected Exceptions with JUnit 5 - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"This post shows how to test for expected exceptions using JUnit 5. If you&#039;re still on JUnit 4, please check out my previous post. 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