✅ haskell: rna-transcription

haskell/rna-transcription/test/Tests.hs

@@ -0,0 +1,61 @@
+{-# LANGUAGE RecordWildCards #-}
+
+import Data.Foldable     (for_)
+import Test.Hspec        (Spec, describe, it, shouldBe)
+import Test.Hspec.Runner (configFastFail, defaultConfig, hspecWith)
+
+import DNA (toRNA)
+
+main :: IO ()
+main = hspecWith defaultConfig {configFastFail = True} specs
+
+specs :: Spec
+specs = describe "toRNA" $ for_ cases test
+  where
+    test Case{..} = it description $ toRNA dna `shouldBe` expected
+
+data Case = Case { description :: String
+                 , dna         :: String
+                 , expected    :: Either Char String
+                 }
+
+cases :: [Case]
+cases = [ Case { description = "Empty RNA sequence"
+               , dna         = ""
+               , expected    = Right ""
+               }
+        , Case { description = "RNA complement of cytosine is guanine"
+               , dna         = "C"
+               , expected    = Right "G"
+               }
+        , Case { description = "RNA complement of guanine is cytosine"
+               , dna         = "G"
+               , expected    = Right "C"
+               }
+        , Case { description = "RNA complement of thymine is adenine"
+               , dna         = "T"
+               , expected    = Right "A"
+               }
+        , Case { description = "RNA complement of adenine is uracil"
+               , dna         = "A"
+               , expected    = Right "U"
+               }
+        , Case { description = "RNA complement"
+               , dna         = "ACGTGGTCTTAA"
+               , expected    = Right "UGCACCAGAAUU"
+               }
+        , Case { description = "correctly handles invalid input (RNA instead of DNA)"
+               , dna         = "U"
+               , expected    = Left 'U'
+               }
+        , Case { description = "correctly handles completely invalid DNA input"
+               , dna         = "XXX"
+               , expected    = Left 'X'
+               }
+        , Case { description = "correctly handles partially invalid DNA input"
+               , dna         = "ACGTXXXCTTAA"
+               , expected    = Left 'X'
+               }
+        ]
+
+-- b02fedbb302892cb17dfa608df335b530ae2bc92