ScoreVerifier to test ConstraintProvider: easy to use

class MyConstraintProvider extends … {

   Constraint[] createConstraints() { ….}

  Constraint teacherConflict(ConstraintFactory factory) {
    return factory.from(Lecture.class).join(...).penalize();
  }
  Constraint roomConflict(ConstraintFactory factory) {
    return factory.from(Lecture.class).join(...).penalize();
  }

}

class MyConstraintProviderTest {

  @Test
  public void teacherConflict() {
     ScoreVerifier.of(MyConstraintProvider::teacherConflict)
	.withData(Ann, Beth, Carl)
            .returns(Ann, Beth);
            .returns(Ann matchWeight == 4, Beth matchWeight == 7
  }

}