{NullString{"brown", false}, "", NullString{"", false}},
		{"chartreuse", "", NullString{"chartreuse", true}},
		{NullString{"darkred", true}, "", NullString{"darkred", true}},
		{NullString{"eel", false}, "", NullString{"", false}},
		{"foo", NullString{"black", false}, nil},
	}}
	nullTestRun(t, spec)
}

func TestGenericNullStringParam(t *testing.T) {

      Has lasted the rest of my life.'

    `You are old,' said the youth, `one would hardly suppose
      That your eye was as steady as ever;
    Yet you balanced an eel on the end of your nose--
      What made you so awfully clever?'

    `I have answered three questions, and that is enough,'
      Said his father; `don't give yourself airs!

      Has lasted the rest of my life.'

    `You are old,' said the youth, `one would hardly suppose
      That your eye was as steady as ever;
    Yet you balanced an eel on the end of your nose--
      What made you so awfully clever?'

    `I have answered three questions, and that is enough,'
      Said his father; `don't give yourself airs!

three Fringes above described? And after what manner are they inflected to make those Fringes? _Qu._ 3. Are not the Rays of Light in passing by the edges and sides of Bodies, bent several times backwards and forwards, with a motion like that of an Eel? And do not the three Fringes of colour'd Light above-mention'd arise from three such bendings? _Qu._ 4. Do not the Rays of Light which fall upon Bodies, and are reflected or refracted, begin to bend before they arrive at the Bodies; and are they not...