Automatically converts String to Enum

StringToEnum.groovy

    enum State {
        A, B, C
    }
    
    class Test {
        State a() {
            "A"
        }
    }
    
    def "Automatically converts String to Enum"() {
        when:
        String x = "A"

        then:
        x as State == State.A
        new Test().a() == State.A
    }