collection.builtBy("a")
        collection.builtBy("b")
        collection.from("f")

        then:
        collection.builtBy == ["a", "b"] as Set<Object>

        when:
        collection.setBuiltBy(["c"])

        then:
        collection.builtBy == ["c"] as Set<Object>

        when:
        def dependencies = collection.buildDependencies.getDependencies(null)

        then: