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diff --git a/files/practicum/SubsTest.icl b/files/practicum/SubsTest.icl
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+module SubsTest
+
+/*	Test module Subs
+	Voor werken met Gast: 
+		(*) gebruik Environment 'Gast'
+		(*) zet Project Options op 'Basic Values Only'
+*/
+
+import StdEnv
+import gast
+import Subs
+
+Start
+							= testn 1000
+							    (\xs -> alle_lengtes_komen_voor xs /\
+							            alle_elementen_zijn_sub xs /\
+							            subs_xs_bevat_xs        xs /\
+							            True
+							    )
+
+alle_lengtes_komen_voor		:: [Int] -> Property
+alle_lengtes_komen_voor xs	= name "alle_lengtes_komen_voor"
+							       (let n = length xs
+							         in sort (removeDup (map length (subs xs))) == [0..n]
+							       )
+
+alle_elementen_zijn_sub		:: [Int] -> Property
+alle_elementen_zijn_sub xs	= name "alle_elementen_zijn_sub" (and [is_sub f xs \\ f <- subs xs])
+
+subs_xs_bevat_xs			:: [Int] -> Property
+subs_xs_bevat_xs xs			= name "subs_xs_bevat_xs" (isMember xs (subs xs))
+
+/*	is_sub sub lijst is True alleen als alle elementen van sub achtereenvolgens voorkomen in lijst.
+*/
+is_sub						:: [a] [a] -> Bool | Eq a
+is_sub [] _					= True
+is_sub _ []					= False
+is_sub [x:xs] [y:ys]
+| x == y					= is_sub xs ys
+| otherwise					= is_sub [x:xs] ys