buildFile << """
            @Managed
            interface SampleComponentSpec extends $componentSpecType {
                String getPublicData()
                void setPublicData(String publicData)
            }

            class RegisterComponentRules extends RuleSource {
                @ComponentType
                void register(TypeBuilder<SampleComponentSpec> builder) {
                }

            interface SampleComponentSpec extends UnmanagedComponentSpec {
                String getPublicData()
                void setPublicData(String data)
            }

            @Managed
            interface InternalSampleSpec {
                String getPublicData()
                void setPublicData(String data)
                String getInternalData()
                void setInternalData(String data)
            }

        given:
        buildFile << """
            interface HaxeSourceSet extends LanguageSourceSet {
                String getPublicData()
                void setPublicData(String data)
            }
            interface HaxeSourceSetInternal {
                String getInternalData()
                void setInternalData(String data)
            }