JUnit 5 + Gradle examples
This article shows you how to add JUnit 5 in a Gradle project.
Technologies used:
- Gradle 5.4.1
- Java 8
- JUnit 5.5.2
1. Gradle + JUnit 5
1. Add the JUni 5 jupiter engine, and define the useJUnitPlatform()
like the following:
gradle.build
plugins {
id 'java'
id 'eclipse' // optional, for Eclipse project
id 'idea' // optional, for IntelliJ IDEA project
}
repositories {
mavenCentral()
}
dependencies {
testImplementation('org.junit.jupiter:junit-jupiter:5.5.2')
}
test {
useJUnitPlatform()
}
2. Gradle Project
A standard Java project structure.
3. JUnit 5
3.1 A simple unit test example.
MessageService.java
package com.mkyong.core;
public class MessageService {
public static String get() {
return "Hello JUnit 5";
}
}
3.2 JUnit 5 simple Assertions
test.
MessageServiceTest.java
package com.mkyong.core;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class MessageServiceTest {
@DisplayName("Test MessageService.get()")
@Test
void testGet() {
assertEquals("Hello JUnit 5", MessageService.get());
}
}
4. gradle test
4.1 Run tests in Gradle.
Terminal
$ cd project
$ gradle test
BUILD SUCCESSFUL in 0s
3 actionable tasks: 3 up-to-date
4.2 If the test is failed, it will display something like this:
Terminal
$ gradle test
> Task :test FAILED
com.mkyong.core.MessageServiceTest > testGet() FAILED
org.opentest4j.AssertionFailedError at MessageServiceTest.java:13
1 test completed, 1 failed
4.3 gradle test
generates the following HTML test report by default:
{project}\build\reports\tests\test\index.html
Done.
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