import javax.inject.Inject;

            @Restricted
            public abstract class TestSoftwareTypeExtension {
                private final Foo foo;
                private boolean isFooConfigured = false;

                @Inject
                public TestSoftwareTypeExtension(ObjectFactory objects) {
                    this.foo = objects.newInstance(Foo.class);
                }

                abstract public TestSoftwareTypeExtension getTestSoftwareTypeExtension();

                @Override
                public void apply(Project target) {
                    System.out.println("Applying " + getClass().getSimpleName());
                    TestSoftwareTypeExtension extension = getTestSoftwareTypeExtension();

        failure.assertThatCause(containsText("Type 'org.gradle.test.SoftwareTypeImplPlugin' property 'testSoftwareTypeExtension' has @SoftwareType annotation with public type 'AnotherSoftwareTypeExtension' used on property of type 'TestSoftwareTypeExtension'."))
    }

    def 'sensible error when a software type plugin is registered that does not expose a software type'() {
        given: