def res = classLoader.getResource("foo.txt")

        then:
        res == new URL("file:foo.txt")

        and:
        1 * parent.getResource("foo.txt") >> new URL("file:foo.txt")
        0 * parent._

        when:
        res = classLoader.getResource("foo.txt")

        then:
        res == new URL("file:foo.txt")

        and:
        0 * parent._
    }

    def "caches missing resources"() {