Write and execute Junit 5 unit tests directly in Jbang

runTests.java

///usr/bin/env jbang "$0" "$@" ; exit $?

// Junit console to start the test engine:
//DEPS org.junit.platform:junit-platform-console:1.8.2

// engine to run the tests (tests are written with Junit5):
//DEPS org.junit.jupiter:junit-jupiter-engine:5.8.2

import static org.junit.jupiter.api.Assertions.fail;

import java.io.PrintWriter;
import java.nio.file.Paths;
import java.util.Collections;

import org.junit.jupiter.api.Test;
import org.junit.platform.console.options.CommandLineOptions;
import org.junit.platform.console.tasks.ConsoleTestExecutor;

public class runTests {

    @Test
    void testName() throws Exception {
        fail("This is an example test");
    }

    public static void main(String... args) throws Exception {
        if (args == null || args.length != 1) {
            System.err.println("Output directory is not specified. Usage:");
            System.err.println(runTests.class.getSimpleName() + ".java <reports output directory>");
            System.exit(1);
            throw new IllegalStateException("Unreachable code");
        }
        CommandLineOptions options = new CommandLineOptions();
        options.setSelectedClasses(Collections.singletonList(runTests.class.getName()));
        options.setReportsDir(Paths.get(args[0]));
        new ConsoleTestExecutor(options).execute(new PrintWriter(System.out));
    }
}

This is a jbang script that:

• defines some JUnit 5 tests. Example: testName() annotated with @Test
• can be executed to run the define test and to publish the test result in the folder passed as parameter.

Usage:

./runTests.java /path/to/output/dir