diff --git a/testcases/automatic/usage-check-4.occ.test b/testcases/automatic/usage-check-4.occ.test
new file mode 100644
index 0000000..431d2f1
--- /dev/null
+++ b/testcases/automatic/usage-check-4.occ.test
@@ -0,0 +1,34 @@
+-- This file tests simple array uses without replication
+-- Four unknown variables are available; x, y, z.
+-- Two arrays are automatically declared; a (size 10*6) and b (size 12*12)
+
+PROC p(INT x, y, z)
+  [10][6]INT a:
+  [12][12]INT b:
+  PAR
+%%
+:
+
+PROC m()
+  SKIP
+:
+
+%PASS Distinct constants
+    a[0][0] := 3
+    a[1][0] := 4
+    a[0][1] := 5
+    a[1][1] := 6
+
+%FAIL Identical constants
+    a[0][0] := 3
+    a[0][0] := 4
+
+%FAIL Identical constants, PAR assign
+    a[0][0],a[0][0] := 3,4
+
+%PASS Same constant, different array
+    a[0][0] := 3
+    b[0][0] := 4
+
+-- TODO add replication and such
+%
diff --git a/transformations/ArrayUsageCheckTest.hs b/transformations/ArrayUsageCheckTest.hs
index 2978264..607208a 100644
--- a/transformations/ArrayUsageCheckTest.hs
+++ b/transformations/ArrayUsageCheckTest.hs
@@ -765,20 +765,18 @@ qcOmegaPrune = [scaleQC (100,1000,10000,50000) prop]
     
 ioqcTests :: IO (Test, [QuickCheckTest])
 ioqcTests
-  = do usageCheckTest1 <- automaticTest "testcases/automatic/usage-check-1.occ.test"
-       usageCheckTest2 <- automaticTest "testcases/automatic/usage-check-2.occ.test"
-       usageCheckTest3 <- automaticTest "testcases/automatic/usage-check-3.occ.test"
-       return
-        (TestList
+  = seqPair
+      (liftM TestList $ sequence
         [
-          testArrayCheck
-         ,testIndexes
-         ,testMakeEquations
-         ,usageCheckTest1
-         ,usageCheckTest2
-         ,usageCheckTest3
+          return testArrayCheck
+         ,return testIndexes
+         ,return testMakeEquations
+         ,automaticTest "testcases/automatic/usage-check-1.occ.test"
+         ,automaticTest "testcases/automatic/usage-check-2.occ.test"
+         ,automaticTest "testcases/automatic/usage-check-3.occ.test"
+         ,automaticTest "testcases/automatic/usage-check-4.occ.test"
         ]
-        ,qcOmegaEquality ++ qcOmegaPrune)
+      ,return $ qcOmegaEquality ++ qcOmegaPrune)