ArchUnit check if abstract classes are abstract

Java
@Test
public void abstractClassesAreAbstract() {
    final JavaClasses importedClasses = new ClassFileImporter()
            .importPackages("net.agilob.project");
    LoggingRulesTest.ABSTRACT_CLASS_MUST_BE_ABSTRACT.check(importedClasses);
}

public static final ArchRule ABSTRACT_CLASS_MUST_BE_ABSTRACT =
    classes()
    .that()
    .haveSimpleNameContaining("Abstract").or().haveSimpleNameContaining("abstract")
    .should()
    .haveModifier(JavaModifier.ABSTRACT);