feat: impl validate function error message output

Signed-off-by: peefy <[email protected]>

pkg/tools/validate/validate.go

@@ -3,6 +3,8 @@
 package validate
 
 import (
+	"errors"
+
 	"kcl-lang.io/kcl-go/pkg/service"
 	"kcl-lang.io/kcl-go/pkg/spec/gpyrpc"
 )
@@ -28,5 +30,9 @@ func ValidateCode(data, code string, opt *ValidateOptions) (ok bool, err error)
 	if err != nil {
 		return false, err
 	}
-	return resp.Success, nil
+	var e error = nil
+	if resp.ErrMessage != "" {
+		e = errors.New(resp.ErrMessage)
+	}
+	return resp.Success, e
 }

pkg/tools/validate/validate_test.go

@@ -3,6 +3,7 @@
 package validate
 
 import (
+	"strings"
 	"testing"
 )
 
@@ -24,3 +25,21 @@ schema Person:
 		t.Fatalf("expect: %q, got False", "True")
 	}
 }
+
+func TestValidateCodeFail(t *testing.T) {
+	data := `{"k": "value"}`
+	code := `
+schema Person:
+    key: str
+
+    check:
+        "value" in key  # 'key' is required and 'key' must contain "value"
+`
+
+	_, err := ValidateCode(data, code, nil)
+	if err == nil {
+		t.Fatalf("expect validation error")
+	} else if !strings.Contains(err.Error(), "error") {
+		t.Fatalf("expect validation error, got %s", err.Error())
+	}
+}