matrix: Rewrite tests to use hspec with fail-fast.

exercises/matrix/package.yaml

@@ -17,4 +17,4 @@ tests:
     source-dirs: test
     dependencies:
       - matrix
-      - HUnit
+      - hspec

exercises/matrix/test/Tests.hs

@@ -1,87 +1,90 @@
-import Test.HUnit (Assertion, (@=?), runTestTT, Test(..), Counts(..))
-import System.Exit (ExitCode(..), exitWith)
-import Matrix ( Matrix, row, column, rows, cols, shape, transpose
-              , reshape, flatten, fromString, fromList)
-import Control.Arrow ((&&&))
-import qualified Data.Vector as V
+import Control.Arrow     ((&&&))
+import Test.Hspec        (Spec, describe, it, shouldBe, shouldSatisfy)
+import Test.Hspec.Runner (configFastFail, defaultConfig, hspecWith)
 
--- Implementation of a row-major matrix for any type, using Data.Vector.
+import qualified Data.Vector as Vector (fromList)
 
--- fromString should work for any type that implements the Read typeclass.
--- You can assume that "\n" is used to delimit rows without context
--- sensitivity, but treatment of whitespace in a row should be context
--- sensitive!
+import Matrix
+  ( Matrix
+  , cols
+  , column
+  , flatten
+  , fromList
+  , fromString
+  , reshape
+  , row
+  , rows
+  , shape
+  , transpose
+  )
 
--- No validation of input is required. Let it fail if the matrix is not
--- rectangular, invalid chars are encountered, etc.
+main :: IO ()
+main = hspecWith defaultConfig {configFastFail = True} specs
 
--- shape is (rows, cols)
+specs :: Spec
+specs = describe "matrix" $ do
 
-exitProperly :: IO Counts -> IO ()
-exitProperly m = do
-  counts <- m
-  exitWith $ if failures counts /= 0 || errors counts /= 0 then ExitFailure 1 else ExitSuccess
+    -- As of 2016-08-08, there was no reference file
+    -- for the test cases in `exercism/x-common`.
 
-testCase :: String -> Assertion -> Test
-testCase label assertion = TestLabel label (TestCase assertion)
+    let intMatrix = fromString :: String -> Matrix Int
+    let vector = Vector.fromList
 
-main :: IO ()
-main = exitProperly $ runTestTT $ TestList
-       [ TestList matrixTests ]
-
-v :: [a] -> V.Vector a
-v = V.fromList
-
-msInt :: String -> Matrix Int
-msInt = fromString
-
-msInteger :: String -> Matrix Integer
-msInteger = fromString
-
-msChar :: String -> Matrix Char
-msChar = fromString
-
-msString :: String -> Matrix String
-msString = fromString
-
-matrixTests :: [Test]
-matrixTests =
-  [ testCase "extract first row" $ do
-    v [1, 2] @=? row 0 (msInt "1 2\n10 20")
-    v [9, 7] @=? row 0 (msInteger "9 7\n8 6")
-  , testCase "extract second row" $ do
-    v [19, 18, 17] @=? row 1 (msInt "9 8 7\n19 18 17")
-    v [16, 25, 36] @=? row 1 (msInteger "1 4 9\n16 25 36")
-  , testCase "extract first column" $ do
-    v [1, 4, 7, 8] @=? column 0 (msInt "1 2 3\n4 5 6\n7 8 9\n 8 7 6")
-    v [1903, 3, 4] @=? column 1 (msInteger "89 1903 3\n18 3 1\n9 4 800")
-  , testCase "shape" $ do
-    (0, 0) @=? shape (msInt "")
-    (1, 1) @=? shape (msInt "1")
-    (2, 1) @=? shape (msInt "1\n2")
-    (1, 2) @=? shape (msInt "1 2")
-    (2, 2) @=? shape (msInt "1 2\n3 4")
-  , testCase "rows & cols" $
-    (1, 2) @=? (rows &&& cols) (msInt "1 2")
-  , testCase "eq" $
-    msInt "1 2" @=? msInt "1 2"
-  , testCase "fromList" $ do
-    msInt "1 2" @=? fromList [[1, 2]]
-    msInt "1\n2" @=? fromList [[1], [2]]
-  , testCase "transpose" $ do
-    msInt "1 2 3" @=? transpose (msInt "1\n2\n3")
-    msInt "1 2 3\n4 5 6" @=? transpose (msInt "1 4\n2 5\n3 6")
-  , testCase "reshape" $ do
-    msInt "1 2\n3 4" @=? reshape (2, 2) (msInt "1 2 3 4")
-  , testCase "flatten" $ do
-    v [1, 2, 3, 4] @=? flatten (msInt "1 2\n3 4")
-  , testCase "matrix of chars" $ do
-    fromList ["foo", "bar"] @=? msChar "'f' 'o' 'o'\n'b' 'a' 'r'"
-  , testCase "matrix of strings" $ do
-    fromList [["this one"], ["may be tricky!"]] @=?
-      msString "\"this one\"\n\"may be tricky!\""
-  , testCase "matrix of strings 2" $ do
-    fromList [["this one", "one"], ["may be tricky!", "really tricky"]] @=?
-      msString "\"this one\" \"one\" \n\"may be tricky!\" \"really tricky\""
-
-  ]
+    it "extract first row" $ do
+      row 0 (intMatrix "1 2\n10 20") `shouldBe` vector [1, 2]
+      row 0 (intMatrix "9 7\n8 6"  ) `shouldBe` vector [9, 7]
+
+    it "extract second row" $ do
+      row 1 (intMatrix "9 8 7\n19 18 17") `shouldBe` vector [19, 18, 17]
+      row 1 (intMatrix "1 4 9\n16 25 36") `shouldBe` vector [16, 25, 36]
+
+    it "extract first column" $ do
+      column 0 (intMatrix "1 2 3\n4 5 6\n7 8 9\n 8 7 6")
+        `shouldBe` vector [1, 4, 7, 8]
+      column 1 (intMatrix "89 1903 3\n18 3 1\n9 4 800")
+        `shouldBe` vector [1903, 3, 4]
+
+    it "shape" $ do
+      shape (intMatrix ""        ) `shouldBe` (0, 0)
+      shape (intMatrix "1"       ) `shouldBe` (1, 1)
+      shape (intMatrix "1\n2"    ) `shouldBe` (2, 1)
+      shape (intMatrix "1 2"     ) `shouldBe` (1, 2)
+      shape (intMatrix "1 2\n3 4") `shouldBe` (2, 2)
+
+    it "rows & cols" $
+      (rows &&& cols) (intMatrix "1 2") `shouldBe` (1, 2)
+
+    it "eq" $ do
+
+      -- `shouldNotBe` is not availabe on lts-2.22.
+      let x `shouldNotBe` y = x `shouldSatisfy` (/= y)
+
+      intMatrix "1 2" `shouldBe`    intMatrix "1 2"
+      intMatrix "2 3" `shouldNotBe` intMatrix "1 2 3"
+
+    it "fromList" $ do
+      fromList [[1 ,  2]] `shouldBe` intMatrix "1 2"
+      fromList [[1], [2]] `shouldBe` intMatrix "1\n2"
+
+    it "transpose" $ do
+      transpose (intMatrix "1\n2\n3"      ) `shouldBe` intMatrix "1 2 3"
+      transpose (intMatrix "1 4\n2 5\n3 6") `shouldBe` intMatrix "1 2 3\n4 5 6"
+
+    it "reshape" $ do
+      reshape (2, 2) (intMatrix "1 2 3 4") `shouldBe` intMatrix "1 2\n3 4"
+
+    it "flatten" $ do
+      flatten (intMatrix "1 2\n3 4") `shouldBe` vector [1, 2, 3, 4]
+
+    it "matrix of chars" $ do
+      fromString "'f' 'o' 'o'\n'b' 'a' 'r'" `shouldBe` fromList ["foo", "bar"]
+
+    it "matrix of strings" $ do
+       fromString "\"this one\"\n\"may be tricky!\""
+       `shouldBe` fromList [ ["this one"      ]
+                           , ["may be tricky!"] ]
+
+    it "matrix of strings 2" $ do
+       fromString "\"this one\" \"one\" \n\"may be tricky!\" \"really tricky\""
+       `shouldBe` fromList [ ["this one"      , "one"          ]
+                           , ["may be tricky!", "really tricky"] ]