Add wasm compiler integration tests with golden file comparison

.github/workflows/ci.yml

@@ -663,6 +663,17 @@ jobs:
             exit 1
           fi
 
+      - name: Run wasm golden tests (Go string API)
+        run: make test-wasm-golden
+
+      - name: Set up Node.js
+        uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4
+        with:
+          node-version: '20'
+
+      - name: Run wasm binary golden tests (Node.js)
+        run: node scripts/test-wasm-golden.mjs
+
   validate-yaml:
     runs-on: ubuntu-latest
     permissions:

Makefile

@@ -77,6 +77,24 @@ update-golden:
 	@echo "Updating golden test files..."
 	go test -v ./pkg/console -run='^TestGolden_' -update
 
+# Wasm golden tests — compare wasm (string API) compiler output against golden files
+.PHONY: test-wasm-golden
+test-wasm-golden:
+	@echo "Running wasm golden tests (Go string API path)..."
+	go test -v -timeout=5m -run='^TestWasmGolden_' ./pkg/workflow
+
+# Update wasm golden files from current string API output
+.PHONY: update-wasm-golden
+update-wasm-golden:
+	@echo "Updating wasm golden test files..."
+	go test -v -timeout=5m -run='^TestWasmGolden_' ./pkg/workflow -update
+
+# Build wasm and run Node.js golden comparison test
+.PHONY: test-wasm
+test-wasm: build-wasm
+	@echo "Running wasm binary golden tests (Node.js)..."
+	node scripts/test-wasm-golden.mjs
+
 # Test specific integration test groups (matching CI workflow)
 .PHONY: test-integration-compile
 test-integration-compile:
@@ -221,9 +239,9 @@ bundle-js:
 	@echo "✓ bundle-js tool built"
 	@echo "To bundle a JavaScript file: ./bundle-js <input-file> [output-file]"
 
-# Test all code (Go and JavaScript)
+# Test all code (Go, JavaScript, and wasm golden)
 .PHONY: test-all
-test-all: test test-js
+test-all: test test-js test-wasm-golden
 
 # Run tests with coverage
 .PHONY: test-coverage
@@ -729,7 +747,10 @@ help:
 	@echo "  test-unit        - Run Go unit tests only (faster)"
 	@echo "  test-security    - Run security regression tests"
 	@echo "  test-js          - Run JavaScript tests"
-	@echo "  test-all         - Run all tests (Go and JavaScript)"
+	@echo "  test-all         - Run all tests (Go, JavaScript, and wasm golden)"
+	@echo "  test-wasm-golden - Run wasm golden tests (Go string API path)"
+	@echo "  test-wasm        - Build wasm and run Node.js golden comparison test"
+	@echo "  update-wasm-golden - Regenerate wasm golden files from current compiler output"
 	@echo "  test-coverage    - Run tests with coverage report"
 	@echo "  bench            - Run benchmarks for performance testing"
 	@echo "  bench-compare    - Run benchmarks with more iterations (for benchstat comparison)"

pkg/parser/virtual_fs_test_helpers.go

@@ -0,0 +1,12 @@
+package parser
+
+// SetReadFileFuncForTest overrides the file reading function for testing.
+// This enables testing virtual filesystem behavior in native (non-wasm) builds.
+// Returns a cleanup function that restores the original.
+func SetReadFileFuncForTest(fn func(string) ([]byte, error)) func() {
+	original := readFileFunc
+	readFileFunc = fn
+	return func() {
+		readFileFunc = original
+	}
+}