}

    @Test
    fun `can adapt unary function using KotlinClosure1`() {

        fun closure(function: String.() -> String) = KotlinClosure1(function)

        assertEquals(
            "GROOVY",
            closure { uppercase(Locale.US) }.call("groovy")
        )
    }

    @Test
    fun `can adapt unary null receiving function using KotlinClosure1`() {