Add test that verifies all of TS parses (#95)

Author: jakebailey

internal/compiler/parser_test.go

@@ -1,9 +1,15 @@
 package compiler
 
 import (
+	"io/fs"
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/microsoft/typescript-go/internal/core"
+	"github.com/microsoft/typescript-go/internal/repo"
+	"github.com/microsoft/typescript-go/internal/tspath"
+	"gotest.tools/v3/assert"
 )
 
 func BenchmarkParse(b *testing.B) {
@@ -20,3 +26,40 @@ func BenchmarkParse(b *testing.B) {
 		})
 	}
 }
+
+func TestParseTypeScriptSrc(t *testing.T) {
+	t.Parallel()
+
+	srcDir := filepath.Join(repo.TypeScriptSubmodulePath, "src")
+
+	if _, err := os.Stat(srcDir); os.IsNotExist(err) {
+		t.Skipf("TypeScript submodule not found at %s", srcDir)
+	}
+
+	err := filepath.WalkDir(srcDir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if d.IsDir() || tspath.TryExtractTSExtension(path) == "" {
+			return nil
+		}
+
+		testName, err := filepath.Rel(srcDir, path)
+		assert.NilError(t, err)
+		testName = filepath.ToSlash(testName)
+
+		t.Run(testName, func(t *testing.T) {
+			t.Parallel()
+
+			sourceText, err := os.ReadFile(path)
+			assert.NilError(t, err)
+
+			sourceFile := ParseSourceFile(path, string(sourceText), core.ScriptTargetESNext)
+			assert.Equal(t, len(sourceFile.Diagnostics()), 0)
+		})
+
+		return nil
+	})
+	assert.NilError(t, err)
+}