test: add native parse file API test (#262)

Signed-off-by: peefy <xpf6677@163.com>

pkg/native/client_test.go

@@ -4,8 +4,12 @@
 package native
 
 import (
+	"fmt"
+	"io"
 	"path"
+	"strings"
 	"testing"
+	"time"
 
 	_ "kcl-lang.io/kcl-go/pkg/plugin/hello_plugin"
 	"kcl-lang.io/kcl-go/pkg/spec/gpyrpc"
@@ -79,3 +83,76 @@ func TestExecArtifactWithPlugin(t *testing.T) {
 		t.Fatal("error message must be empty")
 	}
 }
+
+func TestParseFile(t *testing.T) {
+	// Example: Test with string source
+	src := `schema Name:
+    name: str
+	
+n = Name {name = "name"}` // Sample KCL source code
+	astJson, err := ParseFileASTJson("", src)
+	if err != nil {
+		t.Errorf("ParseFileASTJson failed with string source: %v", err)
+	}
+	if astJson == "" {
+		t.Errorf("Expected non-empty AST JSON with string source")
+	}
+
+	// Example: Test with byte slice source
+	srcBytes := []byte(src)
+	astJson, err = ParseFileASTJson("", srcBytes)
+	if err != nil {
+		t.Errorf("ParseFileASTJson failed with byte slice source: %v", err)
+	}
+	if astJson == "" {
+		t.Errorf("Expected non-empty AST JSON with byte slice source")
+	}
+
+	startTime := time.Now()
+	// Example: Test with io.Reader source
+	srcReader := strings.NewReader(src)
+	astJson, err = ParseFileASTJson("", srcReader)
+	if err != nil {
+		t.Errorf("ParseFileASTJson failed with io.Reader source: %v", err)
+	}
+	if astJson == "" {
+		t.Errorf("Expected non-empty AST JSON with io.Reader source")
+	}
+	elapsed := time.Since(startTime)
+	t.Logf("ParseFileASTJson took %s", elapsed)
+	if !strings.Contains(astJson, "Schema") {
+		t.Errorf("Expected Schema Node AST JSON with io.Reader source")
+	}
+	if !strings.Contains(astJson, "Assign") {
+		t.Errorf("Expected Assign Node AST JSON with io.Reader source")
+	}
+}
+
+func ParseFileASTJson(filename string, src interface{}) (result string, err error) {
+	var code string
+	if src != nil {
+		switch src := src.(type) {
+		case []byte:
+			code = string(src)
+		case string:
+			code = string(src)
+		case io.Reader:
+			d, err := io.ReadAll(src)
+			if err != nil {
+				return "", err
+			}
+			code = string(d)
+		default:
+			return "", fmt.Errorf("unsupported src type: %T", src)
+		}
+	}
+	client := NewNativeServiceClient()
+	resp, err := client.ParseFile(&gpyrpc.ParseFile_Args{
+		Path:   filename,
+		Source: code,
+	})
+	if err != nil {
+		return "", err
+	}
+	return resp.AstJson, nil
+}