{"id":1173,"date":"2022-09-12T09:30:05","date_gmt":"2023-06-26T22:24:05","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/uncategorized\/junit-assert-exception-in-junit-5-and-junit-4\/"},"modified":"2024-03-17T11:29:02","modified_gmt":"2024-03-17T11:29:02","slug":"assert-exception-in-junit-5-and-junit-4","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/assert-exception-in-junit-5-and-junit-4\/","title":{"rendered":"Assert Exception in JUnit 5 and JUnit 4"},"content":{"rendered":"<p>In JUnit 5, we can utilize the assertThrows assertion to test for expected exceptions. This assertion method not only provides the thrown exception but also allows us to verify the exception message.<\/p>\n<h2>JUnit Assert Exception can be paraphrased as &#8220;Exception thrown by JUnit Assert.&#8221;<\/h2>\n<p>I will provide you with one paraphrased option:<br \/>\nThis is an uncomplicated illustration that demonstrates how to confirm an exception in JUnit 5.<\/p>\n<pre class=\"post-pre\"><code>String str = null;\r\nassertThrows(NullPointerException.class, () -&gt; str.length());\r\n<\/code><\/pre>\n<h2>JUnit 5 provides a method to assert exception messages.<\/h2>\n<p>Suppose we define a class as:<\/p>\n<pre class=\"post-pre\"><code>class Foo {\r\n\tvoid foo() throws Exception {\r\n\t\tthrow new Exception(\"Exception Message\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>We should explore how to test an exception and its accompanying message.<\/p>\n<pre class=\"post-pre\"><code>Foo foo = new Foo();\r\nException exception = assertThrows(Exception.class, () -&gt; foo.foo());\r\nassertEquals(\"Exception Message\", exception.getMessage());\r\n<\/code><\/pre>\n<h2>Referred to as JUnit 4&#8217;s Expected Exception.<\/h2>\n<p>We have the option to define the expected exception thrown by the test method by utilizing the expected attribute of the JUnit 4 @Test annotation.<\/p>\n<pre class=\"post-pre\"><code>@Test(expected = Exception.class)\r\npublic void test() throws Exception {\r\n\tFoo foo = new Foo();\r\n\tfoo.foo();\r\n}\r\n<\/code><\/pre>\n<h2>JUnit 4&#8217;s Assert Exception Message<\/h2>\n<p>In order to test the exception message, we must utilize the <a href=\"https:\/\/junit.org\/junit4\/javadoc\/4.12\/org\/junit\/rules\/ExpectedException.html\">ExpectedException<\/a> rule. The following example provides a comprehensive demonstration on how to test both the exception and its message.<\/p>\n<pre class=\"post-pre\"><code> com.scdev.junit4;\r\n\r\nimport org.junit.Rule;\r\nimport org.junit.Test;\r\nimport org.junit.rules.ExpectedException;\r\n\r\npublic class JUnit4TestException {\r\n\r\n\t@Rule\r\n\tpublic ExpectedException thrown = ExpectedException.none();\r\n\r\n\t@Test\r\n\tpublic void test1() throws Exception {\r\n\t\tFoo foo = new Foo();\r\n\t\tthrown.expect(Exception.class);\r\n\t\tthrown.expectMessage(\"Exception Message\");\r\n\t\tfoo.foo();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>That&#8217;s all for a brief summary on testing anticipated exceptions in both JUnit 5 and JUnit 4.<\/p>\n<p>You can find additional examples of JUnit 5 in our project&#8217;s GitHub Repository.<\/p>\n<p>&nbsp;<\/p>\n<p>More tutorials<\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/primefaces-message-messages-and-growl-components\/\" target=\"_blank\" rel=\"noopener\">Primefaces&#8217; Message, Messages, and Growl components<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/a-native-guide-to-the-atop-command-in-linux\/\" target=\"_blank\" rel=\"noopener\">A native guide to the atop command in Linux<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/the-program-in-java-for-displaying-hello-world\/\" target=\"_blank\" rel=\"noopener\">The program in Java for displaying &#8220;Hello World&#8221;<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/converting-a-python-string-to-an-integer-and-vice-versa\/\" target=\"_blank\" rel=\"noopener\">Converting a Python string to an integer and vice versa.<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/python-functions-ord-and-chr\/\" target=\"_blank\" rel=\"noopener\">The Python functions ord() and chr()<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In JUnit 5, we can utilize the assertThrows assertion to test for expected exceptions. This assertion method not only provides the thrown exception but also allows us to verify the exception message. JUnit Assert Exception can be paraphrased as &#8220;Exception thrown by JUnit Assert.&#8221; I will provide you with one paraphrased option: This is an [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1173","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Assert Exception in JUnit 5 and JUnit 4 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"we can utilize the assertThrows assertion to test for expected exceptions. 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