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forth: Add additional tests present in the Rust track #1140

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forth: Add additional tests present in the Rust track #1140

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21 changes: 21 additions & 0 deletions exercises/practice/forth/test/Tests.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,13 @@ specs = do
it "errors if executing a non-existent word" $
runTexts ["1 foo"] `shouldBe` Left (UnknownWord "foo")

it "redefines an existing word with another existing word" $
runTexts [ ": foo 5 ;"
, ": bar foo ;"
, ": foo 6 ;"
, ": bar foo ;"
, "bar foo" ] `shouldBe` Right [6, 6]

describe "case-insensitivity" $ do
it "DUP is case-insensitive" $
runTexts ["1 DUP Dup dup" ] `shouldBe` Right [1, 1, 1, 1]
Expand All @@ -153,3 +160,17 @@ specs = do
it "definitions are case-insensitive" $
runTexts [ ": SWAP DUP Dup dup ;"
, "1 swap" ] `shouldBe` Right [1, 1, 1, 1]

describe "malformed word definitions" $ do
it "empty definition and no end" $
runTexts [":"] `shouldBe` Left InvalidWord
it "no end" $
runTexts [": foo"] `shouldBe` Left InvalidWord
it "no definition" $
runTexts [": ;"] `shouldBe` Left InvalidWord

describe "multiple definitions" $ do
it "on a line" $
runTexts [": one 1 ; : two 2 ; one two +"] `shouldBe` Right [3]
it "after ops" $
runTexts ["1 2 + : addone 1 + ; addone"] `shouldBe` Right [4]