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Module : Test.Surface.Elaborator
Description : Unit tests for the elaborator
Copyright : (c) 2026 Ahmad Ali Parr
License : BSL-1.0
-}
module Test.Surface.Elaborator (tests) where
import Test.Tasty (TestTree, testGroup)
import Test.Tasty.HUnit (testCase, (@?=), Assertion, assertEqual)
import Assertica.Surface.Elaborator
import Assertica.Surface.AST
import Assertica.Surface.Lexer (lexer)
import Assertica.Surface.Parser (parseTerm, parseType, parseProposition, parseAssertion)
import qualified Assertica.Core.AST as Core
import Data.Text (pack)
-- ============================================================================
-- ELABORATOR TESTS
-- ============================================================================
tests :: TestTree
tests = testGroup "Assertica.Surface.Elaborator"
[ testGroup "Terms"
[ testCase "elaborate variable" $
elaborateTermTest "x" isVar
, testCase "elaborate integer constant" $
elaborateTermTest "42" isConstInt
, testCase "elaborate application" $
elaborateTermTest "f x" isApp
, testCase "elaborate lambda" $
elaborateTermTest "\\x -> x" isLam
, testCase "elaborate let binding" $
elaborateTermTest "let x = 42 in x" isLet
]
, testGroup "Types"
[ testCase "elaborate type variable" $
elaborateTypeTest "a" isTyVar
, testCase "elaborate function type" $
elaborateTypeTest "Int -> String" isTyFun
, testCase "elaborate type constant" $
elaborateTypeTest "Int" isTyConst
]
, testGroup "Propositions"
[ testCase "elaborate equality" $
elaboratePropositionTest "x == y" isEq
, testCase "elaborate forall proposition" $
elaboratePropositionTest "forall x. x == x" isForall
]
, testGroup "Assertions"
[ testCase "elaborate simple assertion" $
elaborateAssertionTest "assert test: forall x. x == x"
]
, testGroup "Name resolution"
[ testCase "resolve unbound variable as global" $
elaborateTermTest "x" isVar
, testCase "resolve qualified name" $
elaborateTermTest "Prelude.Bool" isConstr
]
]
-- ============================================================================
-- HELPER FUNCTIONS
-- ============================================================================
dummyLoc :: SourceLoc
dummyLoc = SourceLoc "test.as" 1 1
{-| Elaborate a term and check it with a predicate.
-}
elaborateTermTest :: String -> (Core.Term -> Bool) -> Assertion
elaborateTermTest input predicate = do
case lexer input of
Left err -> fail err
Right tokens -> do
case parseTerm tokens of
Left err -> fail (show err)
Right term -> do
case elaborateTerm term of
Left err -> fail (show err)
Right coreTerm ->
if predicate coreTerm
then return ()
else fail ("Term does not match predicate: " ++ show coreTerm)
{-| Elaborate a type and check it with a predicate.
-}
elaborateTypeTest :: String -> (Core.Type -> Bool) -> Assertion
elaborateTypeTest input predicate = do
case lexer input of
Left err -> fail err
Right tokens -> do
case parseType tokens of
Left err -> fail (show err)
Right surfaceType -> do
case elaborateType surfaceType of
Left err -> fail (show err)
Right coreType ->
if predicate coreType
then return ()
else fail ("Type does not match predicate: " ++ show coreType)
{-| Elaborate a proposition and check it with a predicate.
-}
elaboratePropositionTest :: String -> (Core.Proposition -> Bool) -> Assertion
elaboratePropositionTest input predicate = do
case lexer input of
Left err -> fail err
Right tokens -> do
case parseProposition tokens of
Left err -> fail (show err)
Right surfaceProp -> do
case elaborateProposition surfaceProp of
Left err -> fail (show err)
Right coreProp ->
if predicate coreProp
then return ()
else fail ("Proposition does not match predicate: " ++ show coreProp)
{-| Elaborate an assertion and check it succeeds.
-}
elaborateAssertionTest :: String -> Assertion
elaborateAssertionTest input = do
case lexer input of
Left err -> fail err
Right tokens -> do
case parseAssertion tokens of
Left err -> fail (show err)
Right surfaceAssertion -> do
case elaborateAssertion surfaceAssertion of
Left err -> fail (show err)
Right _assertion -> return ()
-- ============================================================================
-- PREDICATES FOR TERM CHECKING
-- ============================================================================
isVar :: Core.Term -> Bool
isVar Core.Var{} = True
isVar _ = False
isConstInt :: Core.Term -> Bool
isConstInt (Core.Const (Core.IntLit _)) = True
isConstInt _ = False
isApp :: Core.Term -> Bool
isApp Core.App{} = True
isApp _ = False
isLam :: Core.Term -> Bool
isLam Core.Lam{} = True
isLam _ = False
isLet :: Core.Term -> Bool
isLet Core.Let{} = True
isLet _ = False
isConstr :: Core.Term -> Bool
isConstr Core.Constr{} = True
isConstr _ = False
-- ============================================================================
-- PREDICATES FOR TYPE CHECKING
-- ============================================================================
isTyVar :: Core.Type -> Bool
isTyVar Core.TyVar{} = True
isTyVar _ = False
isTyFun :: Core.Type -> Bool
isTyFun Core.TyFun{} = True
isTyFun _ = False
isTyConst :: Core.Type -> Bool
isTyConst Core.TyConst{} = True
isTyConst _ = False
-- ============================================================================
-- PREDICATES FOR PROPOSITION CHECKING
-- ============================================================================
isEq :: Core.Proposition -> Bool
isEq Core.Eq{} = True
isEq _ = False
isForall :: Core.Proposition -> Bool
isForall Core.Forall'{} = True
isForall _ = False
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