implementation 'org.junit.jupiter:junit-jupiter-api'
implementation 'org.junit.jupiter:junit-jupiter-engine'
implementation 'org.junit.platform:junit-platform-launcher'Junit 5 Platform Launcher API
Upasana | September 08, 2019 | 2 min read | 516 views
Running Junit5 based tests programmatically from java/kotlin code based on selected package/class and tag filters using Junit Platform Launcher API.
Setting Gradle dependencies
We need to add the below dependencies to gradle based Spring Boot project for enabling Junit 5 support.
build.gradle
Also, we need to exclude the junit 4 dependencies which are shipped by default for Spring Boot 2.1 based projects.
Exclude Junit4 from classpath
implementation("org.springframework.boot:spring-boot-starter-test") {
exclude module: "junit"
}Executing tests programmatically
We will use LauncherDiscoveryRequest to build a request that will be submitted to Junit TestEngine for test case discovery.
Junit5Runner.java
public class Junit5Runner {
SummaryGeneratingListener listener = new SummaryGeneratingListener();
public void runOne() {
LauncherDiscoveryRequest request = LauncherDiscoveryRequestBuilder.request()
.selectors(selectClass(SampleTest.class)) (1)
.selectors(selectPackage("com.shunya")) (2)
.filters(TagFilter.includeTags("security")) (3)
.build();
Launcher launcher = LauncherFactory.create();
TestPlan testPlan = launcher.discover(request);
launcher.registerTestExecutionListeners(listener);
launcher.execute(request);
}
public static void main(String[] args) {
final Junit5Runner runner = new Junit5Runner();
runner.runOne();
TestExecutionSummary summary = runner.listener.getSummary();
summary.printTo(new PrintWriter(System.out));
}
}| 1 | Select class that we want to include for running testcases |
| 2 | Select package that we want to include for running testcases |
| 3 | Select Tags, only testcases tagged with given name will be filtered for execution |
Output
When we run the above program, following output will be printed to the console. This output is produced by SummaryGeneratingListener
Test run finished after 2410 ms
[ 2 containers found ]
[ 0 containers skipped ]
[ 2 containers started ]
[ 0 containers aborted ]
[ 2 containers successful ]
[ 0 containers failed ]
[ 6 tests found ]
[ 0 tests skipped ]
[ 6 tests started ]
[ 0 tests aborted ]
[ 0 tests successful ]
[ 6 tests failed ]Important points
-
Junit jupyter TestEngine will create a new instance of test class before invoking each test method. This helps making tests independent, as you can’t rely on execution order.
-
Kotlin might be a better choice for writing testcases as tests written in Kotlin are more concise, readable and uses modern language features. So you might think of migrating to Kotlin.
Reference
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