How to pass a null for the below parameterized tests? @ParameterizedTest(name = "#{index} – Run test with args={0}") @ValueSource(strings = {"", " "}) // @ValueSource(strings = {"", " ", null}) // compile error void testBlankIncludeNull(String input) { assertTrue(StringUtils.isBlank(input)); } 1. Solution – @NullSource Since JUnit 5.4 and above, we can use the @NullSource to pass …
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage P.S JUnit 5 requires Java 8 (or higher) at runtime 1. JUnit 5 + Maven See this full JUnit 5 + Maven examples. pom.xml <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5.5.2</version> <scope>test</scope> </dependency> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>3.0.0-M3</version> </plugin> </plugins> </build> P.S The maven-surefire-plugin must be …
In this article, we will show you how to write test assertions with AssertJ. P.S Tested with JUnit 5.5.2 and AssertJ 3.14.0 pom.xml <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5.5.2</version> <scope>test</scope> </dependency> <dependency> <groupId>org.assertj</groupId> <artifactId>assertj-core</artifactId> <version>3.14.0</version> <scope>test</scope> </dependency> 1. JUnit 5 assertions to AssertJ It’s easy to convert JUnit 5 assertions to AssetJ, see the following syntax: JUnit …
In JUnit 5, we can use @DisplayName to declare custom display names for test classes and test methods. P.S Tested with JUnit 5.5.2 1. @DisplayName 1.1 Default name of test classes and methods. DisplayNameTest.java package com.mkyong.display; import org.junit.jupiter.api.Test; public class DisplayNameTest { @Test void test_spaces_ok() { } @Test void test_spaces_fail() { } } Output +– …
In JUnit 5, we can use @Timeout to fail a test if the execution time exceeds a given duration. P.S Tested with JUnit 5.5.2 1. @Timeout TimeOutExample1.java package com.mkyong.timeout; import org.junit.jupiter.api.BeforeEach; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.Timeout; import java.util.concurrent.TimeUnit; public class TimeOutExample1 { // timed out after 5 seconds @BeforeEach @Timeout(5) void setUpDB() throws InterruptedException { //TimeUnit.SECONDS.sleep(10); …
In JUnit 5, we can use assertThrows to assert an exception is thrown. P.S Tested with JUnit 5.5.2 1. Unchecked Exception 1.1 JUnit example of catching a runtime exception. ExceptionExample1.java package com.mkyong.assertions; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; public class ExceptionExample1 { @Test void test_exception() { Exception exception = assertThrows( ArithmeticException.class, () -> divide(1, 0)); assertEquals("/ …
This article shows you how to run a test multiple times with different arguments, so-called ‘Parameterized Tests’, let see the following ways to provide arguments to the test: @ValueSource @EnumSource @MethodSource @CsvSource @CsvFileSource @ArgumentsSource We need junit-jupiter-params to support parameterized tests. pom.xml <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5.5.2</version> <scope>test</scope> </dependency> <!– Parameterized Tests –> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-params</artifactId> …
This article shows you how to use the JUnit 5 ConsoleLauncher to run tests from a command line. Tested with JUnit 5.5.2 junit-platform-console-standalone 1.5.2 1. Download JAR To run tests from the command line, we can download the junit-platform-console-standalone.jar from Maven central repository manually. P.S This example is using version 1.5.2. https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.5.2/ 2. Usages Usually, …
This article shows you how to use the JUnit 5 @RepeatedTest to repeat a test a specified number of times. P.S Tested with JUnit 5.5.2 1. @RepeatedTest 1.1 The @RepeatedTest test method is just like a regular @Test method, the same life cycle. RepeatedSample1Test.java package com.mkyong.repeated; import org.junit.jupiter.api.*; import static org.junit.jupiter.api.Assertions.assertEquals; public class RepeatedSample1Test { …
This article shows you how to use the JUnit 5 @Nested annotation to group tests together. P.S Tested with JUnit 5.5.2 Why nested tests? It’s optional to create nested tests. Still, it helps to create hierarchical contexts to structure the related unit tests together; in short, it helps to keep the tests clean and readable. …
This article shows you how to control the JUnit 5 test execution order via the following MethodOrderer classes: Alphanumeric OrderAnnotation Random Custom Order P.S Tested with JUnit 5.5.2 1. Alphanumeric 1.1 It sorts test methods alphanumerically. MethodAlphanumericTest.java package com.mkyong.order; import org.junit.jupiter.api.MethodOrderer; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.TestMethodOrder; import static org.junit.jupiter.api.Assertions.assertEquals; @TestMethodOrder(MethodOrderer.Alphanumeric.class) public class MethodAlphanumericTest { @Test void …
This article shows you how to use the JUnit 5 tagging and filtering via the @Tag annotation. Tested with JUnit 5.5.2 Maven 3.6.0 Gradle 5.6.2 1. @Tag A simple tagging for demo. TagMethodTest.java package com.mkyong.tags; import org.junit.jupiter.api.Tag; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertEquals; @Tag("branch-20") public class TagMethodTest { @Test @Tag("feature-168") void test1Plus1() { assertEquals(2, 1 + …
JUnit 5 @Disabled example to disable tests on the entire test class or individual test methods. P.S Tested with JUnit 5.5.2 Note You can also disable tests based on conditions. 1. @Disabled on Method 1.1 The test method testCustomerServiceGet is disabled. DisabledMethodTest.java package com.mkyong.disable; import org.junit.jupiter.api.Disabled; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertEquals; public class DisabledMethodTest { …
This article shows you how to use JUnit 5 to enable or disable tests based on conditions. P.S Tested with JUnit 5.5.2 1. Operating System 1.1 Enabled or disabled tests based on a particular operating system via @EnabledOnOs and @DisabledOnOs annotations. OperatingSystemTest.java package com.mkyong.conditional; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.condition.DisabledOnOs; import org.junit.jupiter.api.condition.EnabledOnOs; import org.junit.jupiter.api.condition.OS; public class OperatingSystemTest …
This article shows you how to use JUnit 5 Assumptions to perform a conditional test execution. Technologies used: Maven 3.6 Java 8 JUnit 5.5.2 1. Assumptions 1.1 If the assumeTrue() condition is true, then run the test, else aborting the test. 1.2 The assumingThat() is much more flexible, it allows part of the code to …
This article shows you how to add JUnit 5 in a Maven project, nothing special, just add the JUnit 5 junit-jupiter-engine library and make sure the maven-surefire-plugin is at least version 2.22.0 Technologies used: Maven 3.6 Java 8 JUnit 5.5.2 1. Maven + JUnit 5 1. Add the JUni 5 jupiter engine. pom.xml <dependency> <groupId>org.junit.jupiter</groupId> …