{"id":107807,"date":"2020-12-09T07:00:00","date_gmt":"2020-12-09T05:00:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=107807"},"modified":"2020-12-06T22:46:07","modified_gmt":"2020-12-06T20:46:07","slug":"parameterized-tests-in-junit-5","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/12\/parameterized-tests-in-junit-5.html","title":{"rendered":"Parameterized Tests in JUnit 5"},"content":{"rendered":"<p>A parameterized test allows you to run a test against a varying set of data. If you find yourself calling the same test but with different inputs, over and over again, a parameterized test would help make your code cleaner. To create one in JUnit 5 you need to:<\/p>\n<ul>\n<li>Annotate the test method with <a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/ParameterizedTest.html\"><code>@ParameterizedTest<\/code><\/a><\/li>\n<li>Annotate the test method with at lease one <i>source<\/i> e.g. <a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/ValueSource.html\"><code>@ValueSource<\/code><\/a><\/li>\n<li>Consume the arguments in the test method<\/li>\n<\/ul>\n<p>The sections below describe some of the commonly used source annotations you can use to provide inputs to your test methods.<\/p>\n<p><b><span><a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/ValueSource.html\">@ValueSource<\/a><\/span><\/b><br \/>\nThis annotation lets you specify a single array of literal values that will be passed to your test method one by one, as shown in the example below:<\/p>\n<div>\n<div id=\"highlighter_365908\" 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\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<div class=\"line number5 index4 alt2\">5<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java color1\">@ParameterizedTest<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java color1\">@ValueSource<\/code><code class=\"java plain\">(ints = {<\/code><code class=\"java value\">2<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">4<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">6<\/code><code class=\"java plain\">})<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testIsEven(<\/code><code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code> <code class=\"java plain\">i) {<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertTrue(i % <\/code><code class=\"java value\">2<\/code> <code class=\"java plain\">== <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number5 index4 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><a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/CsvSource.html\">@CsvSource<\/a><\/span><\/b><br \/>\nThis annotation allows you to specify an array of comma-separated values, which is useful if your test method takes multiple arguments. If you have a large number of arguments, you can use an <a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/aggregator\/ArgumentsAccessor.html\"><code>ArgumentsAccessor<\/code><\/a> to extract the arguments as opposed to creating a method with a long parameter list. For example:<\/p>\n<div>\n<div id=\"highlighter_277728\" 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 color1\">@ParameterizedTest<\/code><code class=\"java plain\">(name = <\/code><code class=\"java string\">\"Person with name {0} and age {1}\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java color1\">@CsvSource<\/code><code class=\"java plain\">({ <\/code><code class=\"java string\">\"Alice, 28\"<\/code><code class=\"java plain\">,<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java string\">\"Bob, 30\"<\/code> <code class=\"java plain\">})<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testPerson(<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">String name, <\/code><code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code> <code class=\"java plain\">age) {<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">Person p = <\/code><code class=\"java keyword\">new<\/code> <code class=\"java plain\">Person(name, age);<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getName(), is(name));<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getAge(), is(age));<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java color1\">@ParameterizedTest<\/code><code class=\"java plain\">(name = <\/code><code class=\"java string\">\"Person with name {0} and age {1}\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java color1\">@CsvSource<\/code><code class=\"java plain\">({ <\/code><code class=\"java string\">\"Alice, 28\"<\/code><code class=\"java plain\">,<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java string\">\"Bob, 30\"<\/code> <code class=\"java plain\">})<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testPersonWithArgumentAccessor(<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">ArgumentsAccessor arguments) {<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">String name = arguments.getString(<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code> <code class=\"java plain\">age = arguments.getInteger(<\/code><code class=\"java value\">1<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">Person p = <\/code><code class=\"java keyword\">new<\/code> <code class=\"java plain\">Person(name, age);<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getName(), is(name));<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getAge(), is(age));<\/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>By the way, note how I have also customised the display name of the test using the <code>{0}<\/code> and <code>{1}<\/code> argument placeholders.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<p><b><span><a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/CsvFileSource.html\">@CsvFileSource<\/a><\/span><\/b><br \/>\nThis annotation is similar to <code>CsvSource<\/code> but allows you to load your test inputs from a CSV file on the classpath. For example:<\/p>\n<div>\n<div id=\"highlighter_763783\" 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\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<div class=\"line number4 index3 alt1\">4<\/div>\n<div class=\"line number5 index4 alt2\">5<\/div>\n<div class=\"line number6 index5 alt1\">6<\/div>\n<div class=\"line number7 index6 alt2\">7<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"java color1\">@ParameterizedTest<\/code><code class=\"java plain\">(name = <\/code><code class=\"java string\">\"Person with name {0} and age {1}\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java color1\">@CsvFileSource<\/code><code class=\"java plain\">(resources = { <\/code><code class=\"java string\">\"data.csv\"<\/code> <code class=\"java plain\">})<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testPerson(<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">String name, <\/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<\/code><code class=\"java keyword\">final<\/code> <code class=\"java plain\">Person p = <\/code><code class=\"java keyword\">new<\/code> <code class=\"java plain\">Person(name, age);<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getName(), is(name));<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertThat(p.getAge(), is(age));<\/code><\/div>\n<div class=\"line number7 index6 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><a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/MethodSource.html\">@MethodSource<\/a><\/span><\/b><br \/>\nThis annotation allows you to specify a factory method which returns a stream of objects to be passed to your test method. If your test method has multiple arguments, your factory method should return a stream of <a href=\"https:\/\/junit.org\/junit5\/docs\/current\/api\/org.junit.jupiter.params\/org\/junit\/jupiter\/params\/provider\/Arguments.html\"><code>Arguments<\/code><\/a> instances as shown in the example below:<\/p>\n<div>\n<div id=\"highlighter_575801\" 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<\/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.junit.jupiter.params.provider.Arguments.*;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java color1\">@ParameterizedTest<\/code><code class=\"java plain\">(name = <\/code><code class=\"java string\">\"{0} is sorted to {1}\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java color1\">@MethodSource<\/code><code class=\"java plain\">(<\/code><code class=\"java string\">\"dataProvider\"<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java keyword\">void<\/code> <code class=\"java plain\">testSort(<\/code><code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] input, <\/code><code class=\"java keyword\">final<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] expected) {<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">Arrays.sort(input);<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">assertArrayEquals(expected, input);<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java keyword\">static<\/code> <code class=\"java plain\">Stream&lt;Arguments&gt; dataProvider() {<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java plain\">Stream.of(<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">arguments(<\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">1<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">2<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">3<\/code> <code class=\"java plain\">}, <\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">1<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">2<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">3<\/code> <code class=\"java plain\">}),<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">arguments(<\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">3<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">2<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">1<\/code> <code class=\"java plain\">}, <\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">1<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">2<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">3<\/code> <code class=\"java plain\">}),<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">arguments(<\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">5<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">5<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">5<\/code> <code class=\"java plain\">}, <\/code><code class=\"java keyword\">new<\/code> <code class=\"java keyword\">int<\/code><code class=\"java plain\">[] { <\/code><code class=\"java value\">5<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">5<\/code><code class=\"java plain\">, <\/code><code class=\"java value\">5<\/code> <code class=\"java plain\">}));<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>For more information, see the <a href=\"https:\/\/junit.org\/junit5\/docs\/current\/user-guide\/#writing-tests-parameterized-tests\">JUnit 5 User Guide on Parameterized Tests<\/a>.<\/p>\n<p>If you&#8217;re still on JUnit 4 (why?!), check out my previous post on <a href=\"http:\/\/fahdshariff.blogspot.com\/2011\/06\/parameterized-tests-in-junit.html\">Parameterized Tests in JUnit 4<\/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\/12\/parameterized-tests-in-junit-5.html\" target=\"_blank\" rel=\"noopener noreferrer\">Parameterized Tests in 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>A parameterized test allows you to run a test against a varying set of data. If you find yourself calling the same test but with different inputs, over and over again, a parameterized test would help make your code cleaner. To create one in JUnit 5 you need to: Annotate the test method with @ParameterizedTest &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":[1936,273],"class_list":["post-107807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","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>Parameterized Tests in JUnit 5 - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"A parameterized test allows you to run a test against a varying set of data. 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