test_cofactor = ->
	run_test [

		"cofactor(((1,2),(3,4)),1,1)",
		"4",

		"cofactor(((1,2),(3,4)),1,2)",
		"-3",

		"cofactor(((1,2),(3,4)),2,1)",
		"-2",

		"cofactor(((1,2),(3,4)),2,2)",
		"1",

		"cofactor(((1,2,3),(4,5,6),(7,8,9)),1,2)",
		"6",
	]