feat: release managed service generation and contract diagnostics

config/config.go

@@ -56,14 +56,18 @@ func (c Config) Validate() error {
 	if err := c.Errors.Validate(); err != nil {
 		return err
 	}
-	if c.ResponseEncoder == nil {
+	encoder := c.ResponseEncoder
+	if encoder == nil {
 		f, err := response.New(c.Response)
 		if err != nil {
 			return err
 		}
-		if err = f.ValidateErrors(c.Errors); err != nil {
-			return err
-		}
+		encoder = f
+	}
+	// Check the same composition that App.New installs, including custom
+	// encoders and their existing catalogs, before App construction.
+	if _, err := response.WithErrors(c.Errors, encoder); err != nil {
+		return err
 	}
 	if err := c.Response.Validate(); err != nil {
 		return err

config/response_test.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"strings"
+	"testing"
+
+	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
+	"git.yuntuo.hk/k2safe/go-omni/response"
+)
+
+func TestValidateEffectiveResponsePolicy(t *testing.T) {
+	catalog := apierrors.Catalog{DefaultStatus: 400, Definitions: map[string]apierrors.Definition{
+		"INVALID": {Code: 400002, Message: "invalid input"},
+	}}
+	other := catalog.Clone()
+	other.Definitions["INVALID"] = apierrors.Definition{Code: 400003, Message: "other input"}
+	formatter := response.MustNew(response.Config{CodeType: "int32", SuccessCode: 0, ErrorCode: 9999})
+	for _, tc := range []struct {
+		name      string
+		encoder   response.Encoder
+		wantError string
+	}{
+		{"incompatibleCode", response.RawJSON(response.MustNew(response.Config{CodeType: "int32", SuccessCode: 0, ErrorCode: 9999, Codes: map[string]any{"INVALID": 100}})), "conflicting"},
+		{"differentCatalog", response.MustWithErrors(other, formatter), "different error catalogs"},
+		{"matchingCatalog", response.MustWithErrors(catalog, formatter), ""},
+		{"rawJSON", response.RawJSON(response.MustNew(response.Config{CodeType: "int32", SuccessCode: 0, ErrorCode: 9999})), ""},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			cfg := Default()
+			cfg.Errors, cfg.ResponseEncoder = catalog, tc.encoder
+			err := cfg.Validate()
+			if tc.wantError == "" {
+				if err != nil {
+					t.Fatal(err)
+				}
+			} else if err == nil || !strings.Contains(err.Error(), tc.wantError) {
+				t.Fatalf("want %q, got %v", tc.wantError, err)
+			}
+		})
+	}
+}