Adds Junit5 and assertJ to a gradle project

junit5-gradle

dependencies {
  testImplementation('org.junit.jupiter:junit-jupiter:5.4.1')
  testCompile('org.assertj:assertj-core:3.11.1')
}

test {
  useJUnitPlatform()
    testLogging {
      events "passed", "skipped", "failed"
  }
}