unit test

haskell-math.cabal

@@ -61,4 +61,5 @@ test-suite haskell-math-test
         GF2test
     build-depends:
         base ^>=4.18.2.1,
-        haskell-math
+        haskell-math,
+        HUnit

test/GF2test.hs

@@ -1,5 +1,7 @@
 module GF2test (run) where
 
+import Test.HUnit
+
 import LinearAlgebra.GF2
   ( fromBools
   , gaussianEliminationIndices
@@ -12,18 +14,30 @@ run = do
     let rowsBools =
           [ [True, False, True]
           , [False, True, True]
-          , [True, True, False]
           , [True, True, True]
+          , [True, True, False]
           ]
 
         nCols = length (head rowsBools)
         rowsBits = map fromBools rowsBools
-
+        maybeIndices = gaussianEliminationIndices nCols rowsBits
-    let maybeIndices = gaussianEliminationIndices nCols rowsBits
 
     case maybeIndices of
-        Nothing   -> putStrLn "No combination found."
+        Nothing   -> assertFailure "expected rows 0,1,3"
-        Just idxs -> putStrLn $ "Rows: " ++ show idxs
+        Just rows -> assertEqual "expected rows 0,1,3" rows [0,1,3]
+
+
+    -- no depency case
+    let rowsBools2 =
+          [ [True, False, True]
+          , [False, True, True]
+          , [True, True, True]
+          ]
+        nCols2 = length (head rowsBools2)
+        rowsBits2 = map fromBools rowsBools2
+        maybeIndices2 = gaussianEliminationIndices nCols2 rowsBits2
+
+    assertEqual "Expected no dependency" Nothing maybeIndices2
 
     putStrLn "GF2 Test Done."