https://junit.org/junit5/docs/current/api/org/junit/jupiter/api/parallel/Execution.html

http://antkorwin.com/junit5/junit5_parallel_execution.html
    https://github.com/antkorwin/junit5-prallel-execution

https://www.swtestacademy.com/junit5-parallel-test-execution/

src/test/resources/junit-platform.properties

junit.jupiter.extensions.autodetection.enabled = true
junit.jupiter.execution.parallel.enabled=true
junit.jupiter.execution.parallel.mode.default=threaded
#concurrent
junit.jupiter.execution.parallel.config.strategy=fixed
#dynamic
junit.jupiter.execution.parallel.config.fixed.parallelism=4
junit.jupiter.execution.parallel.mode.classes.default=threaded
#concurrent

https://junit.org/junit5/docs/current/api/org/junit/platform/engine/support/hierarchical/ParallelExecutionConfigurationStrategy.html

at test file
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.parallel.Execution;
import org.junit.jupiter.api.parallel.ExecutionMode;
 
@Execution(ExecutionMode.CONCURRENT)
public class LoginTest extends BaseTest {
    @Tag("stress")
    ...
    @RepeatedTest(value = 10, name = "{displayName} {currentRepetition}/{totalRepetitions}")
    void testTagged() throws Exception {
        System.out.println("one more! " + Thread.currentThread().getName());
        assertThat(true).isTrue();
        Thread.sleep(1000);
    }

}

cat ...\build\test-results\test\TEST-<package>.<class>.xml