surefire-config.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
...
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<version>2.22.0</version>
				<configuration>
					<properties>
						<configurationParameters>
							junit.jupiter.execution.parallel.enabled=true
							junit.jupiter.execution.parallel.config.dynamic.factor=1
						</configurationParameters>
					</properties>
				</configuration>
			</plugin>
		</plugins>
	</build>
...
</project>