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diff --git a/lib/Numeric/LinearAlgebra/Tests.hs b/lib/Numeric/LinearAlgebra/Tests.hs
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+-----------------------------------------------------------------------------
+{- |
+Module      :  Numeric.LinearAlgebra.Tests
+Copyright   :  (c) Alberto Ruiz 2007
+License     :  GPL-style
+
+Maintainer  :  Alberto Ruiz (aruiz at um dot es)
+Stability   :  provisional
+Portability :  portable
+
+Some tests.
+
+-}
+
+module Numeric.LinearAlgebra.Tests(
+  module Numeric.LinearAlgebra.Tests.Instances,
+  module Numeric.LinearAlgebra.Tests.Properties,
+  qCheck,RM,CM, rM,cM, rHer,cHer,rRot,cRot,rSq,cSq,
+    runTests
+--, runBigTests
+) where
+
+import Numeric.LinearAlgebra
+import Numeric.LinearAlgebra.Tests.Instances
+import Numeric.LinearAlgebra.Tests.Properties
+import Test.QuickCheck
+import Debug.Trace
+
+qCheck n = check defaultConfig {configSize = const n}
+
+debug x = trace (show x) x
+
+type RM = Matrix Double
+type CM = Matrix (Complex Double)
+
+rM m = m :: RM
+cM m = m :: CM
+
+rHer (Her m) = m :: RM
+cHer (Her m) = m :: CM
+
+rRot (Rot m) = m :: RM
+cRot (Rot m) = m :: CM
+
+rSq  (Sq m)  = m :: RM
+cSq  (Sq m)  = m :: CM
+
+rWC (WC m) = m :: RM
+cWC (WC m) = m :: CM
+
+-- | It runs all the tests.
+runTests :: Int  -- ^ maximum dimension
+         -> IO ()
+runTests n = do
+    qCheck n (hermitian . rHer)
+    qCheck n (hermitian . cHer)
+    qCheck n (unitary . rRot)
+    qCheck n (unitary . cRot)
+    qCheck n (wellCond . rWC)
+    qCheck n (wellCond . cWC)
+    --------------------------------
+    qCheck n (luTest . rM)
+    qCheck n (luTest . cM)
+
+-- | Some additional tests on big matrices. They take a few minutes.
+runBigTests :: IO ()
+runBigTests = undefined