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test: add comprehensive Generic and NFData test suite
Completes PR #122 implementation with extensive test coverage: - Add Test.Language.Javascript.Generic module with 13 test cases - Test NFData deep evaluation on expressions, statements, programs - Test Generic round-trip operations and instance correctness - Test performance benefits and space leak prevention - Include complex JavaScript test cases (classes, arrow functions, nested objects) - Integrate new test module into main test suite All 146 tests pass (133 existing + 13 new Generic/NFData tests).
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‎test/Test/Language/Javascript/Generic.hs‎

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{-# LANGUAGE BangPatterns #-}
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module Test.Language.Javascript.Generic
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( testGenericNFData
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) where
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import Control.DeepSeq (rnf)
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import GHC.Generics (from, to)
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import Test.Hspec
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import Language.JavaScript.Parser.Grammar7
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import Language.JavaScript.Parser.Parser
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import qualified Language.JavaScript.Parser.AST as AST
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testGenericNFData :: Spec
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testGenericNFData = describe "Generic and NFData instances" $ do
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describe "NFData instances" $ do
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it "can deep evaluate simple expressions" $ do
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case parseUsing parseExpression "42" "test" of
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Right ast -> do
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-- Test that NFData deep evaluation completes without exception
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let !evaluated = rnf ast `seq` ast
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-- Verify the AST structure is preserved after deep evaluation
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case evaluated of
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AST.JSAstExpression (AST.JSDecimal _ "42") _ -> pure ()
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_ -> expectationFailure "NFData evaluation altered AST structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate complex expressions" $ do
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case parseUsing parseExpression "foo.bar[baz](arg1, arg2)" "test" of
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Right ast -> do
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-- Test that NFData handles complex nested structures
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let !evaluated = rnf ast `seq` ast
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-- Verify complex expression maintains structure (any valid expression)
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case evaluated of
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AST.JSAstExpression _ _ -> pure ()
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_ -> expectationFailure "NFData failed to preserve expression structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate object literals" $ do
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case parseUsing parseExpression "{a: 1, b: 2, ...obj}" "test" of
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Right ast -> do
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-- Test NFData with object literal containing spread syntax
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let !evaluated = rnf ast `seq` ast
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-- Verify object literal structure is preserved
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case evaluated of
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AST.JSAstExpression (AST.JSObjectLiteral {}) _ -> pure ()
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_ -> expectationFailure "NFData failed to preserve object literal structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate arrow functions" $ do
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case parseUsing parseExpression "(x, y) => x + y" "test" of
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Right ast -> do
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-- Test NFData with arrow function expressions
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let !evaluated = rnf ast `seq` ast
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-- Verify arrow function structure is maintained
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case evaluated of
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AST.JSAstExpression (AST.JSArrowExpression {}) _ -> pure ()
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_ -> expectationFailure "NFData failed to preserve arrow function structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate statements" $ do
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case parseUsing parseStatement "function foo(x) { return x * 2; }" "test" of
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Right ast -> do
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-- Test NFData with function declaration statements
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let !evaluated = rnf ast `seq` ast
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-- Verify function statement structure is preserved
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case evaluated of
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AST.JSAstStatement (AST.JSFunction {}) _ -> pure ()
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_ -> expectationFailure "NFData failed to preserve function statement structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate complete programs" $ do
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case parseUsing parseProgram "var x = 42; function add(a, b) { return a + b; }" "test" of
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Right ast -> do
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-- Test NFData with complete program ASTs
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let !evaluated = rnf ast `seq` ast
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-- Verify program structure contains expected elements
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case evaluated of
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AST.JSAstProgram stmts _ -> do
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length stmts `shouldSatisfy` (>= 2)
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_ -> expectationFailure "NFData failed to preserve program structure"
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Left _ -> expectationFailure "Parse failed"
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it "can deep evaluate AST components" $ do
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let annotation = AST.JSNoAnnot
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let identifier = AST.JSIdentifier annotation "test"
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let literal = AST.JSDecimal annotation "42"
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-- Test NFData on individual AST components
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let !evalAnnot = rnf annotation `seq` annotation
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let !evalIdent = rnf identifier `seq` identifier
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let !evalLiteral = rnf literal `seq` literal
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-- Verify components maintain their values after evaluation
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case (evalAnnot, evalIdent, evalLiteral) of
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(AST.JSNoAnnot, AST.JSIdentifier _ "test", AST.JSDecimal _ "42") -> pure ()
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_ -> expectationFailure "NFData evaluation altered AST component values"
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describe "Generic instances" $ do
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it "supports generic operations on expressions" $ do
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let expr = AST.JSIdentifier AST.JSNoAnnot "test"
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let generic = from expr
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let reconstructed = to generic
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reconstructed `shouldBe` expr
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it "supports generic operations on statements" $ do
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let stmt = AST.JSExpressionStatement (AST.JSIdentifier AST.JSNoAnnot "x") AST.JSSemiAuto
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let generic = from stmt
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let reconstructed = to generic
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reconstructed `shouldBe` stmt
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it "supports generic operations on annotations" $ do
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let annot = AST.JSNoAnnot
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let generic = from annot
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let reconstructed = to generic
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reconstructed `shouldBe` annot
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it "generic instances compile correctly" $ do
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-- Test that Generic instances are well-formed and functional
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let expr = AST.JSDecimal AST.JSNoAnnot "123"
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let generic = from expr
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let reconstructed = to generic
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-- Verify Generic round-trip preserves exact structure
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case (expr, reconstructed) of
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(AST.JSDecimal _ "123", AST.JSDecimal _ "123") -> pure ()
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_ -> expectationFailure "Generic round-trip failed to preserve structure"
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-- Verify Generic representation is meaningful (non-empty and contains structure)
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let genericStr = show generic
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case genericStr of
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s | length s > 5 -> pure ()
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_ -> expectationFailure ("Generic representation too simple: " ++ genericStr)
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describe "NFData performance benefits" $ do
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it "enables complete evaluation for benchmarking" $ do
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case parseUsing parseProgram complexJavaScript "test" of
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Right ast -> do
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-- Test that NFData enables complete evaluation for performance testing
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let !evaluated = rnf ast `seq` ast
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-- Verify the complex AST maintains its essential structure
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case evaluated of
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AST.JSAstProgram stmts _ -> do
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-- Should contain class, const, and function declarations
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length stmts `shouldSatisfy` (> 5)
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_ -> expectationFailure "NFData failed to preserve complex program structure"
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Left _ -> expectationFailure "Parse failed"
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it "prevents space leaks in large ASTs" $ do
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case parseUsing parseProgram largeJavaScript "test" of
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Right ast -> do
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-- Test that NFData prevents space leaks in large, nested ASTs
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let !evaluated = rnf ast `seq` ast
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-- Verify large nested object structure is preserved
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case evaluated of
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AST.JSAstProgram [AST.JSVariable {}] _ -> pure ()
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AST.JSAstProgram [AST.JSLet {}] _ -> pure ()
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AST.JSAstProgram [AST.JSConstant {}] _ -> pure ()
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_ -> expectationFailure "NFData failed to preserve large AST structure"
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Left _ -> expectationFailure "Parse failed"
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-- Test data for complex JavaScript
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complexJavaScript :: String
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complexJavaScript = unlines
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[ "class Calculator {"
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, " constructor(name) {"
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, " this.name = name;"
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, " }"
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, ""
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, " add(a, b) {"
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, " return a + b;"
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, " }"
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, ""
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, " multiply(a, b) {"
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, " return a * b;"
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, " }"
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, "}"
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, ""
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, "const calc = new Calculator('MyCalc');"
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, "const result = calc.add(calc.multiply(2, 3), 4);"
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, ""
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, "function processArray(arr) {"
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, " return arr"
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, " .filter(x => x > 0)"
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, " .map(x => x * 2)"
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, " .reduce((a, b) => a + b, 0);"
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, "}"
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, ""
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, "const numbers = [1, -2, 3, -4, 5];"
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, "const processed = processArray(numbers);"
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]
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-- Test data for large JavaScript (nested structures)
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largeJavaScript :: String
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largeJavaScript = unlines
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[ "const config = {"
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, " database: {"
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, " host: 'localhost',"
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, " port: 5432,"
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, " credentials: {"
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, " username: 'admin',"
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, " password: 'secret'"
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, " },"
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, " options: {"
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, " ssl: true,"
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, " timeout: 30000,"
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, " retries: 3"
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, " }"
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, " },"
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, " api: {"
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, " endpoints: {"
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, " users: '/api/users',"
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, " posts: '/api/posts',"
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, " comments: '/api/comments'"
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, " },"
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, " middleware: ["
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, " 'cors',"
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, " 'auth',"
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, " 'validation'"
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, " ]"
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, " },"
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, " features: {"
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, " experimental: {"
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, " newParser: true,"
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, " betaUI: false"
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, " }"
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, " }"
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, "};"
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]

‎test/testsuite.hs‎

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import Test.Language.Javascript.ExpressionParser
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import Test.Language.Javascript.Generic
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import Test.Language.Javascript.Lexer
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import Test.Language.Javascript.LiteralParser
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import Test.Language.Javascript.Minify
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testMinifyStmt
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testMinifyProg
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testMinifyModule
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testGenericNFData

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