fix(admin): 模型测试 - 按图片能力使用默认尺寸与质量参数

backend/internal/service/channel_models.go

@@ -259,6 +259,16 @@ func (s *Service) TestAdminChannelModel(ctx context.Context, actor *model.User,
 		videoSeconds = "5"
 		videoSecondsValue = 5
 	}
+	imageSize, imageQuality := "", ""
+	var imageProfile *ImageCapabilityConfig
+	if capability == "image" {
+		profile, normalizeErr := NormalizeModelCapabilityConfig(capability, string(protocol), req.CapabilityConfig)
+		if normalizeErr != nil {
+			return nil, normalizeErr
+		}
+		imageProfile = profile.Image
+		imageSize, imageQuality = imageTestDefaults(imageProfile)
+	}
 	input := canvasGenerationInput{
 		Mode:   capability,
 		Prompt: prompt,
@@ -271,8 +281,8 @@ func (s *Service) TestAdminChannelModel(ctx context.Context, actor *model.User,
 			SecretKey:          channel.SecretKey,
 			Headers:            headers,
 			Model:              modelKey,
-			Size:               map[string]string{"image": "1024x1024", "video": "16:9"}[capability],
-			Quality:            "auto",
+			Size:               map[string]string{"image": imageSize, "video": "16:9"}[capability],
+			Quality:            imageQuality,
 			Count:              "1",
 			VideoSeconds:       videoSeconds,
 			VQuality:           "720",
@@ -285,11 +295,7 @@ func (s *Service) TestAdminChannelModel(ctx context.Context, actor *model.User,
 		Metadata: map[string]interface{}{},
 	}
 	if capability == "image" {
-		profile, normalizeErr := NormalizeModelCapabilityConfig(capability, string(protocol), req.CapabilityConfig)
-		if normalizeErr != nil {
-			return nil, normalizeErr
-		}
-		input.ImageCapability = profile.Image
+		input.ImageCapability = imageProfile
 	}
 
 	// 测试复用真实生成协议、运行时并发和熔断策略，但不创建用户任务或计费订单。
@@ -320,6 +326,22 @@ func (s *Service) TestAdminChannelModel(ctx context.Context, actor *model.User,
 	return &AdminChannelModelTestResult{DurationMs: time.Since(startedAt).Milliseconds()}, nil
 }
 
+// 模型测试必须使用当前模型声明的默认参数，避免固定分辨率 SKU 被通用 1K 测试值误伤。
+func imageTestDefaults(profile *ImageCapabilityConfig) (string, string) {
+	if profile == nil {
+		return "1024x1024", "auto"
+	}
+	size := ""
+	if profile.Size.Parameter != "none" {
+		size = strings.TrimSpace(profile.Size.Default)
+	}
+	quality := ""
+	if profile.Quality.Supported {
+		quality = strings.TrimSpace(profile.Quality.Default)
+	}
+	return size, quality
+}
+
 func normalizeChannelModelContract(channel *model.ModelChannel, req ChannelModelRequest) (string, string, model.ChannelInterfaceType, error) {
 	modelKey := strings.TrimPrefix(strings.TrimSpace(req.ModelKey), "models/")
 	if modelKey == "" {

backend/internal/service/channel_models_test.go

@@ -38,3 +38,45 @@ func TestNormalizeChannelModelContractRequiresJiMengSecret(t *testing.T) {
 		t.Fatal("normalizeChannelModelContract() should require JiMeng credentials")
 	}
 }
+
+func TestImageTestDefaultsUseModelCapability(t *testing.T) {
+	tests := []struct {
+		name        string
+		profile     *ImageCapabilityConfig
+		wantSize    string
+		wantQuality string
+	}{
+		{name: "legacy fallback", wantSize: "1024x1024", wantQuality: "auto"},
+		{
+			name: "fixed 2k model",
+			profile: &ImageCapabilityConfig{
+				Size:    ImageSizeConfig{Parameter: "size", Default: "2048x2048"},
+				Quality: ImageQualityConfig{Supported: false, Default: "auto"},
+			},
+			wantSize: "2048x2048",
+		},
+		{
+			name: "provider selected size",
+			profile: &ImageCapabilityConfig{
+				Size:    ImageSizeConfig{Parameter: "none", Default: "auto"},
+				Quality: ImageQualityConfig{Supported: false},
+			},
+		},
+		{
+			name: "gpt image capability",
+			profile: &ImageCapabilityConfig{
+				Size:    ImageSizeConfig{Parameter: "size", Default: "1024x1536"},
+				Quality: ImageQualityConfig{Supported: true, Default: "high"},
+			},
+			wantSize: "1024x1536", wantQuality: "high",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			size, quality := imageTestDefaults(test.profile)
+			if size != test.wantSize || quality != test.wantQuality {
+				t.Fatalf("imageTestDefaults() = %q, %q; want %q, %q", size, quality, test.wantSize, test.wantQuality)
+			}
+		})
+	}
+}