spec.allowPackage("org.junit")
            spec.disallowClass("org.junit.Test")
        }

        expect:
        canLoadClass(Before)
        cannotLoadClass(Test)
    }

    void disallowClassWinsOverAllowClass() {
        given:
        withSpec { FilteringClassLoader.Spec spec ->
            spec.allowClass(Test)
            spec.disallowClass(Test.name)
        }

        expect:

        groovyCompilerClassLoaderSpec.disallowClass("groovy.util.GroovyTestCase");
        groovyCompilerClassLoaderSpec.disallowClass("groovy.test.GroovyTestCase");
        groovyCompilerClassLoaderSpec.disallowClass("org.codehaus.groovy.transform.NotYetImplementedASTTransformation");
        groovyCompilerClassLoaderSpec.disallowPackage("groovy.servlet");

            classNames.add(clazz.getName());
        }

        /**
         * Marks a single class as not visible.
         *
         * @param className the class name
         */
        public void disallowClass(String className) {
            disallowedClassNames.add(className);
        }

        /**
         * Marks a package and all its sub-packages as not visible. Does not affect resources in those packages.