feat: add gemini image test preview

backend/internal/handler/admin/account_handler.go

@@ -628,6 +628,7 @@ func (h *AccountHandler) Delete(c *gin.Context) {
 // TestAccountRequest represents the request body for testing an account
 type TestAccountRequest struct {
 	ModelID string `json:"model_id"`
+	Prompt  string `json:"prompt"`
 }
 
 type SyncFromCRSRequest struct {
@@ -658,7 +659,7 @@ func (h *AccountHandler) Test(c *gin.Context) {
 	_ = c.ShouldBindJSON(&req)
 
 	// Use AccountTestService to test the account with SSE streaming
-	if err := h.accountTestService.TestAccountConnection(c, accountID, req.ModelID); err != nil {
+	if err := h.accountTestService.TestAccountConnection(c, accountID, req.ModelID, req.Prompt); err != nil {
 		// Error already sent via SSE, just log
 		return
 	}

backend/internal/service/account_test_service.go

@@ -45,16 +45,23 @@ const (
 
 // TestEvent represents a SSE event for account testing
 type TestEvent struct {
-	Type    string `json:"type"`
+	Type     string `json:"type"`
-	Text    string `json:"text,omitempty"`
+	Text     string `json:"text,omitempty"`
-	Model   string `json:"model,omitempty"`
+	Model    string `json:"model,omitempty"`
-	Status  string `json:"status,omitempty"`
+	Status   string `json:"status,omitempty"`
-	Code    string `json:"code,omitempty"`
+	Code     string `json:"code,omitempty"`
-	Data    any    `json:"data,omitempty"`
+	ImageURL string `json:"image_url,omitempty"`
-	Success bool   `json:"success,omitempty"`
+	MimeType string `json:"mime_type,omitempty"`
-	Error   string `json:"error,omitempty"`
+	Data     any    `json:"data,omitempty"`
+	Success  bool   `json:"success,omitempty"`
+	Error    string `json:"error,omitempty"`
 }
 
+const (
+	defaultGeminiTextTestPrompt  = "hi"
+	defaultGeminiImageTestPrompt = "Generate a cute orange cat astronaut sticker on a clean pastel background."
+)
+
 // AccountTestService handles account testing operations
 type AccountTestService struct {
 	accountRepo               AccountRepository
@@ -161,7 +168,7 @@ func createTestPayload(modelID string) (map[string]any, error) {
 // TestAccountConnection tests an account's connection by sending a test request
 // All account types use full Claude Code client characteristics, only auth header differs
 // modelID is optional - if empty, defaults to claude.DefaultTestModel
-func (s *AccountTestService) TestAccountConnection(c *gin.Context, accountID int64, modelID string) error {
+func (s *AccountTestService) TestAccountConnection(c *gin.Context, accountID int64, modelID string, prompt string) error {
 	ctx := c.Request.Context()
 
 	// Get account
@@ -176,11 +183,11 @@ func (s *AccountTestService) TestAccountConnection(c *gin.Context, accountID int
 	}
 
 	if account.IsGemini() {
-		return s.testGeminiAccountConnection(c, account, modelID)
+		return s.testGeminiAccountConnection(c, account, modelID, prompt)
 	}
 
 	if account.Platform == PlatformAntigravity {
-		return s.routeAntigravityTest(c, account, modelID)
+		return s.routeAntigravityTest(c, account, modelID, prompt)
 	}
 
 	if account.Platform == PlatformSora {
@@ -435,7 +442,7 @@ func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account
 }
 
 // testGeminiAccountConnection tests a Gemini account's connection
-func (s *AccountTestService) testGeminiAccountConnection(c *gin.Context, account *Account, modelID string) error {
+func (s *AccountTestService) testGeminiAccountConnection(c *gin.Context, account *Account, modelID string, prompt string) error {
 	ctx := c.Request.Context()
 
 	// Determine the model to use
@@ -462,7 +469,7 @@ func (s *AccountTestService) testGeminiAccountConnection(c *gin.Context, account
 	c.Writer.Flush()
 
 	// Create test payload (Gemini format)
-	payload := createGeminiTestPayload()
+	payload := createGeminiTestPayload(testModelID, prompt)
 
 	// Build request based on account type
 	var req *http.Request
@@ -1198,10 +1205,10 @@ func truncateSoraErrorBody(body []byte, max int) string {
 
 // routeAntigravityTest 路由 Antigravity 账号的测试请求。
 // APIKey 类型走原生协议（与 gateway_handler 路由一致），OAuth/Upstream 走 CRS 中转。
-func (s *AccountTestService) routeAntigravityTest(c *gin.Context, account *Account, modelID string) error {
+func (s *AccountTestService) routeAntigravityTest(c *gin.Context, account *Account, modelID string, prompt string) error {
 	if account.Type == AccountTypeAPIKey {
 		if strings.HasPrefix(modelID, "gemini-") {
-			return s.testGeminiAccountConnection(c, account, modelID)
+			return s.testGeminiAccountConnection(c, account, modelID, prompt)
 		}
 		return s.testClaudeAccountConnection(c, account, modelID)
 	}
@@ -1349,14 +1356,46 @@ func (s *AccountTestService) buildCodeAssistRequest(ctx context.Context, accessT
 	return req, nil
 }
 
-// createGeminiTestPayload creates a minimal test payload for Gemini API
+// createGeminiTestPayload creates a minimal test payload for Gemini API.
-func createGeminiTestPayload() []byte {
+// Image models use the image-generation path so the frontend can preview the returned image.
+func createGeminiTestPayload(modelID string, prompt string) []byte {
+	if isImageGenerationModel(modelID) {
+		imagePrompt := strings.TrimSpace(prompt)
+		if imagePrompt == "" {
+			imagePrompt = defaultGeminiImageTestPrompt
+		}
+
+		payload := map[string]any{
+			"contents": []map[string]any{
+				{
+					"role": "user",
+					"parts": []map[string]any{
+						{"text": imagePrompt},
+					},
+				},
+			},
+			"generationConfig": map[string]any{
+				"responseModalities": []string{"TEXT", "IMAGE"},
+				"imageConfig": map[string]any{
+					"aspectRatio": "1:1",
+				},
+			},
+		}
+		bytes, _ := json.Marshal(payload)
+		return bytes
+	}
+
+	textPrompt := strings.TrimSpace(prompt)
+	if textPrompt == "" {
+		textPrompt = defaultGeminiTextTestPrompt
+	}
+
 	payload := map[string]any{
 		"contents": []map[string]any{
 			{
 				"role": "user",
 				"parts": []map[string]any{
-					{"text": "hi"},
+					{"text": textPrompt},
 				},
 			},
 		},
@@ -1416,6 +1455,17 @@ func (s *AccountTestService) processGeminiStream(c *gin.Context, body io.Reader)
 								if text, ok := partMap["text"].(string); ok && text != "" {
 									s.sendEvent(c, TestEvent{Type: "content", Text: text})
 								}
+								if inlineData, ok := partMap["inlineData"].(map[string]any); ok {
+									mimeType, _ := inlineData["mimeType"].(string)
+									data, _ := inlineData["data"].(string)
+									if strings.HasPrefix(strings.ToLower(mimeType), "image/") && data != "" {
+										s.sendEvent(c, TestEvent{
+											Type:     "image",
+											ImageURL: fmt.Sprintf("data:%s;base64,%s", mimeType, data),
+											MimeType: mimeType,
+										})
+									}
+								}
 							}
 						}
 					}
@@ -1602,7 +1652,7 @@ func (s *AccountTestService) RunTestBackground(ctx context.Context, accountID in
 	ginCtx, _ := gin.CreateTestContext(w)
 	ginCtx.Request = (&http.Request{}).WithContext(ctx)
 
-	testErr := s.TestAccountConnection(ginCtx, accountID, modelID)
+	testErr := s.TestAccountConnection(ginCtx, accountID, modelID, "")
 
 	finishedAt := time.Now()
 	body := w.Body.String()

backend/internal/service/account_test_service_gemini_test.go

@@ -0,0 +1,59 @@
+//go:build unit
+
+package service
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCreateGeminiTestPayload_ImageModel(t *testing.T) {
+	t.Parallel()
+
+	payload := createGeminiTestPayload("gemini-2.5-flash-image", "draw a tiny robot")
+
+	var parsed struct {
+		Contents []struct {
+			Parts []struct {
+				Text string `json:"text"`
+			} `json:"parts"`
+		} `json:"contents"`
+		GenerationConfig struct {
+			ResponseModalities []string `json:"responseModalities"`
+			ImageConfig        struct {
+				AspectRatio string `json:"aspectRatio"`
+			} `json:"imageConfig"`
+		} `json:"generationConfig"`
+	}
+
+	require.NoError(t, json.Unmarshal(payload, &parsed))
+	require.Len(t, parsed.Contents, 1)
+	require.Len(t, parsed.Contents[0].Parts, 1)
+	require.Equal(t, "draw a tiny robot", parsed.Contents[0].Parts[0].Text)
+	require.Equal(t, []string{"TEXT", "IMAGE"}, parsed.GenerationConfig.ResponseModalities)
+	require.Equal(t, "1:1", parsed.GenerationConfig.ImageConfig.AspectRatio)
+}
+
+func TestProcessGeminiStream_EmitsImageEvent(t *testing.T) {
+	t.Parallel()
+	gin.SetMode(gin.TestMode)
+
+	ctx, recorder := newSoraTestContext()
+	svc := &AccountTestService{}
+
+	stream := strings.NewReader("data: {\"candidates\":[{\"content\":{\"parts\":[{\"text\":\"ok\"},{\"inlineData\":{\"mimeType\":\"image/png\",\"data\":\"QUJD\"}}]}}]}\n\ndata: [DONE]\n\n")
+
+	err := svc.processGeminiStream(ctx, stream)
+	require.NoError(t, err)
+
+	body := recorder.Body.String()
+	require.Contains(t, body, "\"type\":\"content\"")
+	require.Contains(t, body, "\"text\":\"ok\"")
+	require.Contains(t, body, "\"type\":\"image\"")
+	require.Contains(t, body, "\"image_url\":\"data:image/png;base64,QUJD\"")
+	require.Contains(t, body, "\"mime_type\":\"image/png\"")
+}

frontend/src/components/account/AccountTestModal.vue

@@ -15,7 +15,7 @@
           <div
             class="flex h-10 w-10 items-center justify-center rounded-lg bg-gradient-to-br from-primary-500 to-primary-600"
           >
-            <Icon name="userCircle" size="md" class="text-white" :stroke-width="2" />
+            <Icon name="play" size="md" class="text-white" :stroke-width="2" />
           </div>
           <div>
             <div class="font-semibold text-gray-900 dark:text-gray-100">{{ account.name }}</div>
@@ -61,6 +61,17 @@
         {{ t('admin.accounts.soraTestHint') }}
       </div>
 
+      <div v-if="supportsGeminiImageTest" class="space-y-1.5">
+        <TextArea
+          v-model="testPrompt"
+          :label="t('admin.accounts.geminiImagePromptLabel')"
+          :placeholder="t('admin.accounts.geminiImagePromptPlaceholder')"
+          :hint="t('admin.accounts.geminiImageTestHint')"
+          :disabled="status === 'connecting'"
+          rows="3"
+        />
+      </div>
+
       <!-- Terminal Output -->
       <div class="group relative">
         <div
@@ -69,25 +80,11 @@
         >
           <!-- Status Line -->
           <div v-if="status === 'idle'" class="flex items-center gap-2 text-gray-500">
-            <Icon name="bolt" size="sm" :stroke-width="2" />
+            <Icon name="play" size="sm" :stroke-width="2" />
             <span>{{ t('admin.accounts.readyToTest') }}</span>
           </div>
           <div v-else-if="status === 'connecting'" class="flex items-center gap-2 text-yellow-400">
-            <svg class="h-4 w-4 animate-spin" fill="none" viewBox="0 0 24 24">
+            <Icon name="refresh" size="sm" class="animate-spin" :stroke-width="2" />
-              <circle
-                class="opacity-25"
-                cx="12"
-                cy="12"
-                r="10"
-                stroke="currentColor"
-                stroke-width="4"
-              ></circle>
-              <path
-                class="opacity-75"
-                fill="currentColor"
-                d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
-              ></path>
-            </svg>
             <span>{{ t('admin.accounts.connectingToApi') }}</span>
           </div>
 
@@ -106,21 +103,14 @@
             v-if="status === 'success'"
             class="mt-3 flex items-center gap-2 border-t border-gray-700 pt-3 text-green-400"
           >
-            <svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <Icon name="check" size="sm" :stroke-width="2" />
-              <path
-                stroke-linecap="round"
-                stroke-linejoin="round"
-                stroke-width="2"
-                d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z"
-              />
-            </svg>
             <span>{{ t('admin.accounts.testCompleted') }}</span>
           </div>
           <div
             v-else-if="status === 'error'"
             class="mt-3 flex items-center gap-2 border-t border-gray-700 pt-3 text-red-400"
           >
-            <Icon name="xCircle" size="sm" :stroke-width="2" />
+            <Icon name="x" size="sm" :stroke-width="2" />
             <span>{{ errorMessage }}</span>
           </div>
         </div>
@@ -132,21 +122,48 @@
           class="absolute right-2 top-2 rounded-lg bg-gray-800/80 p-1.5 text-gray-400 opacity-0 transition-all hover:bg-gray-700 hover:text-white group-hover:opacity-100"
           :title="t('admin.accounts.copyOutput')"
         >
-          <Icon name="copy" size="sm" :stroke-width="2" />
+          <Icon name="link" size="sm" :stroke-width="2" />
         </button>
       </div>
 
+      <div v-if="generatedImages.length > 0" class="space-y-2">
+        <div class="text-xs font-medium text-gray-600 dark:text-gray-300">
+          {{ t('admin.accounts.geminiImagePreview') }}
+        </div>
+        <div class="grid gap-3 sm:grid-cols-2">
+          <a
+            v-for="(image, index) in generatedImages"
+            :key="`${image.url}-${index}`"
+            :href="image.url"
+            target="_blank"
+            rel="noopener noreferrer"
+            class="overflow-hidden rounded-xl border border-gray-200 bg-white shadow-sm transition hover:border-primary-300 hover:shadow-md dark:border-dark-500 dark:bg-dark-700"
+          >
+            <img :src="image.url" :alt="`gemini-test-image-${index + 1}`" class="h-48 w-full object-cover" />
+            <div class="border-t border-gray-100 px-3 py-2 text-xs text-gray-500 dark:border-dark-500 dark:text-gray-300">
+              {{ image.mimeType || 'image/*' }}
+            </div>
+          </a>
+        </div>
+      </div>
+
       <!-- Test Info -->
       <div class="flex items-center justify-between px-1 text-xs text-gray-500 dark:text-gray-400">
         <div class="flex items-center gap-3">
           <span class="flex items-center gap-1">
-            <Icon name="cpu" size="sm" :stroke-width="2" />
+            <Icon name="grid" size="sm" :stroke-width="2" />
             {{ isSoraAccount ? t('admin.accounts.soraTestTarget') : t('admin.accounts.testModel') }}
           </span>
         </div>
         <span class="flex items-center gap-1">
-          <Icon name="chatBubble" size="sm" :stroke-width="2" />
+          <Icon name="chat" size="sm" :stroke-width="2" />
-          {{ isSoraAccount ? t('admin.accounts.soraTestMode') : t('admin.accounts.testPrompt') }}
+          {{
+            isSoraAccount
+              ? t('admin.accounts.soraTestMode')
+              : supportsGeminiImageTest
+                ? t('admin.accounts.geminiImageTestMode')
+                : t('admin.accounts.testPrompt')
+          }}
         </span>
       </div>
     </div>
@@ -174,54 +191,15 @@
                   : 'bg-primary-500 text-white hover:bg-primary-600'
           ]"
         >
-          <svg
+          <Icon
             v-if="status === 'connecting'"
-            class="h-4 w-4 animate-spin"
+            name="refresh"
-            fill="none"
+            size="sm"
-            viewBox="0 0 24 24"
+            class="animate-spin"
-          >
+            :stroke-width="2"
-            <circle
+          />
-              class="opacity-25"
+          <Icon v-else-if="status === 'idle'" name="play" size="sm" :stroke-width="2" />
-              cx="12"
+          <Icon v-else name="refresh" size="sm" :stroke-width="2" />
-              cy="12"
-              r="10"
-              stroke="currentColor"
-              stroke-width="4"
-            ></circle>
-            <path
-              class="opacity-75"
-              fill="currentColor"
-              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
-            ></path>
-          </svg>
-          <svg
-            v-else-if="status === 'idle'"
-            class="h-4 w-4"
-            fill="none"
-            viewBox="0 0 24 24"
-            stroke="currentColor"
-          >
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              stroke-width="2"
-              d="M14.752 11.168l-3.197-2.132A1 1 0 0010 9.87v4.263a1 1 0 001.555.832l3.197-2.132a1 1 0 000-1.664z"
-            />
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              stroke-width="2"
-              d="M21 12a9 9 0 11-18 0 9 9 0 0118 0z"
-            />
-          </svg>
-          <svg v-else class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              stroke-width="2"
-              d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"
-            />
-          </svg>
           <span>
             {{
               status === 'connecting'
@@ -242,7 +220,8 @@ import { computed, ref, watch, nextTick } from 'vue'
 import { useI18n } from 'vue-i18n'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Select from '@/components/common/Select.vue'
-import Icon from '@/components/icons/Icon.vue'
+import TextArea from '@/components/common/TextArea.vue'
+import { Icon } from '@/components/icons'
 import { useClipboard } from '@/composables/useClipboard'
 import { adminAPI } from '@/api/admin'
 import type { Account, ClaudeModel } from '@/types'
@@ -255,6 +234,11 @@ interface OutputLine {
   class: string
 }
 
+interface PreviewImage {
+  url: string
+  mimeType?: string
+}
+
 const props = defineProps<{
   show: boolean
   account: Account | null
@@ -271,15 +255,25 @@ const streamingContent = ref('')
 const errorMessage = ref('')
 const availableModels = ref<ClaudeModel[]>([])
 const selectedModelId = ref('')
+const testPrompt = ref('')
 const loadingModels = ref(false)
 let eventSource: EventSource | null = null
 const isSoraAccount = computed(() => props.account?.platform === 'sora')
+const generatedImages = ref<PreviewImage[]>([])
+const supportsGeminiImageTest = computed(() => {
+  if (isSoraAccount.value) return false
+  const modelID = selectedModelId.value.toLowerCase()
+  if (!modelID.startsWith('gemini-') || !modelID.includes('-image')) return false
+
+  return props.account?.platform === 'gemini' || (props.account?.platform === 'antigravity' && props.account?.type === 'apikey')
+})
 
 // Load available models when modal opens
 watch(
   () => props.show,
   async (newVal) => {
     if (newVal && props.account) {
+      testPrompt.value = ''
       resetState()
       await loadAvailableModels()
     } else {
@@ -288,6 +282,12 @@ watch(
   }
 )
 
+watch(selectedModelId, () => {
+  if (supportsGeminiImageTest.value && !testPrompt.value.trim()) {
+    testPrompt.value = t('admin.accounts.geminiImagePromptDefault')
+  }
+})
+
 const loadAvailableModels = async () => {
   if (!props.account) return
   if (props.account.platform === 'sora') {
@@ -332,6 +332,7 @@ const resetState = () => {
   outputLines.value = []
   streamingContent.value = ''
   errorMessage.value = ''
+  generatedImages.value = []
 }
 
 const handleClose = () => {
@@ -385,7 +386,12 @@ const startTest = async () => {
         'Content-Type': 'application/json'
       },
       body: JSON.stringify(
-        isSoraAccount.value ? {} : { model_id: selectedModelId.value }
+        isSoraAccount.value
+          ? {}
+          : {
+              model_id: selectedModelId.value,
+              prompt: supportsGeminiImageTest.value ? testPrompt.value.trim() : ''
+            }
       )
     })
 
@@ -436,6 +442,8 @@ const handleEvent = (event: {
   model?: string
   success?: boolean
   error?: string
+  image_url?: string
+  mime_type?: string
 }) => {
   switch (event.type) {
     case 'test_start':
@@ -444,7 +452,11 @@ const handleEvent = (event: {
         addLine(t('admin.accounts.usingModel', { model: event.model }), 'text-cyan-400')
       }
       addLine(
-        isSoraAccount.value ? t('admin.accounts.soraTestingFlow') : t('admin.accounts.sendingTestMessage'),
+        isSoraAccount.value
+          ? t('admin.accounts.soraTestingFlow')
+          : supportsGeminiImageTest.value
+            ? t('admin.accounts.sendingGeminiImageRequest')
+            : t('admin.accounts.sendingTestMessage'),
         'text-gray-400'
       )
       addLine('', 'text-gray-300')
@@ -458,6 +470,16 @@ const handleEvent = (event: {
       }
       break
 
+    case 'image':
+      if (event.image_url) {
+        generatedImages.value.push({
+          url: event.image_url,
+          mimeType: event.mime_type
+        })
+        addLine(t('admin.accounts.geminiImageReceived', { count: generatedImages.value.length }), 'text-purple-300')
+      }
+      break
+
     case 'test_complete':
       // Move streaming content to output lines
       if (streamingContent.value) {

frontend/src/components/admin/account/AccountTestModal.vue

@@ -61,6 +61,17 @@
         {{ t('admin.accounts.soraTestHint') }}
       </div>
 
+      <div v-if="supportsGeminiImageTest" class="space-y-1.5">
+        <TextArea
+          v-model="testPrompt"
+          :label="t('admin.accounts.geminiImagePromptLabel')"
+          :placeholder="t('admin.accounts.geminiImagePromptPlaceholder')"
+          :hint="t('admin.accounts.geminiImageTestHint')"
+          :disabled="status === 'connecting'"
+          rows="3"
+        />
+      </div>
+
       <!-- Terminal Output -->
       <div class="group relative">
         <div
@@ -115,6 +126,27 @@
         </button>
       </div>
 
+      <div v-if="generatedImages.length > 0" class="space-y-2">
+        <div class="text-xs font-medium text-gray-600 dark:text-gray-300">
+          {{ t('admin.accounts.geminiImagePreview') }}
+        </div>
+        <div class="grid gap-3 sm:grid-cols-2">
+          <a
+            v-for="(image, index) in generatedImages"
+            :key="`${image.url}-${index}`"
+            :href="image.url"
+            target="_blank"
+            rel="noopener noreferrer"
+            class="overflow-hidden rounded-xl border border-gray-200 bg-white shadow-sm transition hover:border-primary-300 hover:shadow-md dark:border-dark-500 dark:bg-dark-700"
+          >
+            <img :src="image.url" :alt="`gemini-test-image-${index + 1}`" class="h-48 w-full object-cover" />
+            <div class="border-t border-gray-100 px-3 py-2 text-xs text-gray-500 dark:border-dark-500 dark:text-gray-300">
+              {{ image.mimeType || 'image/*' }}
+            </div>
+          </a>
+        </div>
+      </div>
+
       <!-- Test Info -->
       <div class="flex items-center justify-between px-1 text-xs text-gray-500 dark:text-gray-400">
         <div class="flex items-center gap-3">
@@ -125,7 +157,13 @@
         </div>
         <span class="flex items-center gap-1">
           <Icon name="chat" size="sm" :stroke-width="2" />
-          {{ isSoraAccount ? t('admin.accounts.soraTestMode') : t('admin.accounts.testPrompt') }}
+          {{
+            isSoraAccount
+              ? t('admin.accounts.soraTestMode')
+              : supportsGeminiImageTest
+                ? t('admin.accounts.geminiImageTestMode')
+                : t('admin.accounts.testPrompt')
+          }}
         </span>
       </div>
     </div>
@@ -182,6 +220,7 @@ import { computed, ref, watch, nextTick } from 'vue'
 import { useI18n } from 'vue-i18n'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Select from '@/components/common/Select.vue'
+import TextArea from '@/components/common/TextArea.vue'
 import { Icon } from '@/components/icons'
 import { useClipboard } from '@/composables/useClipboard'
 import { adminAPI } from '@/api/admin'
@@ -195,6 +234,11 @@ interface OutputLine {
   class: string
 }
 
+interface PreviewImage {
+  url: string
+  mimeType?: string
+}
+
 const props = defineProps<{
   show: boolean
   account: Account | null
@@ -211,15 +255,25 @@ const streamingContent = ref('')
 const errorMessage = ref('')
 const availableModels = ref<ClaudeModel[]>([])
 const selectedModelId = ref('')
+const testPrompt = ref('')
 const loadingModels = ref(false)
 let eventSource: EventSource | null = null
 const isSoraAccount = computed(() => props.account?.platform === 'sora')
+const generatedImages = ref<PreviewImage[]>([])
+const supportsGeminiImageTest = computed(() => {
+  if (isSoraAccount.value) return false
+  const modelID = selectedModelId.value.toLowerCase()
+  if (!modelID.startsWith('gemini-') || !modelID.includes('-image')) return false
+
+  return props.account?.platform === 'gemini' || (props.account?.platform === 'antigravity' && props.account?.type === 'apikey')
+})
 
 // Load available models when modal opens
 watch(
   () => props.show,
   async (newVal) => {
     if (newVal && props.account) {
+      testPrompt.value = ''
       resetState()
       await loadAvailableModels()
     } else {
@@ -228,6 +282,12 @@ watch(
   }
 )
 
+watch(selectedModelId, () => {
+  if (supportsGeminiImageTest.value && !testPrompt.value.trim()) {
+    testPrompt.value = t('admin.accounts.geminiImagePromptDefault')
+  }
+})
+
 const loadAvailableModels = async () => {
   if (!props.account) return
   if (props.account.platform === 'sora') {
@@ -272,6 +332,7 @@ const resetState = () => {
   outputLines.value = []
   streamingContent.value = ''
   errorMessage.value = ''
+  generatedImages.value = []
 }
 
 const handleClose = () => {
@@ -325,7 +386,12 @@ const startTest = async () => {
         'Content-Type': 'application/json'
       },
       body: JSON.stringify(
-        isSoraAccount.value ? {} : { model_id: selectedModelId.value }
+        isSoraAccount.value
+          ? {}
+          : {
+              model_id: selectedModelId.value,
+              prompt: supportsGeminiImageTest.value ? testPrompt.value.trim() : ''
+            }
       )
     })
 
@@ -376,6 +442,8 @@ const handleEvent = (event: {
   model?: string
   success?: boolean
   error?: string
+  image_url?: string
+  mime_type?: string
 }) => {
   switch (event.type) {
     case 'test_start':
@@ -384,7 +452,11 @@ const handleEvent = (event: {
         addLine(t('admin.accounts.usingModel', { model: event.model }), 'text-cyan-400')
       }
       addLine(
-        isSoraAccount.value ? t('admin.accounts.soraTestingFlow') : t('admin.accounts.sendingTestMessage'),
+        isSoraAccount.value
+          ? t('admin.accounts.soraTestingFlow')
+          : supportsGeminiImageTest.value
+            ? t('admin.accounts.sendingGeminiImageRequest')
+            : t('admin.accounts.sendingTestMessage'),
         'text-gray-400'
       )
       addLine('', 'text-gray-300')
@@ -398,6 +470,16 @@ const handleEvent = (event: {
       }
       break
 
+    case 'image':
+      if (event.image_url) {
+        generatedImages.value.push({
+          url: event.image_url,
+          mimeType: event.mime_type
+        })
+        addLine(t('admin.accounts.geminiImageReceived', { count: generatedImages.value.length }), 'text-purple-300')
+      }
+      break
+
     case 'test_complete':
       // Move streaming content to output lines
       if (streamingContent.value) {

frontend/src/components/admin/account/__tests__/AccountTestModal.spec.ts

@@ -0,0 +1,145 @@
+import { flushPromises, mount } from '@vue/test-utils'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import AccountTestModal from '../AccountTestModal.vue'
+
+const { getAvailableModels, copyToClipboard } = vi.hoisted(() => ({
+  getAvailableModels: vi.fn(),
+  copyToClipboard: vi.fn()
+}))
+
+vi.mock('@/api/admin', () => ({
+  adminAPI: {
+    accounts: {
+      getAvailableModels
+    }
+  }
+}))
+
+vi.mock('@/composables/useClipboard', () => ({
+  useClipboard: () => ({
+    copyToClipboard
+  })
+}))
+
+vi.mock('vue-i18n', async () => {
+  const actual = await vi.importActual<typeof import('vue-i18n')>('vue-i18n')
+  const messages: Record<string, string> = {
+    'admin.accounts.geminiImagePromptDefault': 'Generate a cute orange cat astronaut sticker on a clean pastel background.'
+  }
+  return {
+    ...actual,
+    useI18n: () => ({
+      t: (key: string, params?: Record<string, string | number>) => {
+        if (key === 'admin.accounts.geminiImageReceived' && params?.count) {
+          return `received-${params.count}`
+        }
+        return messages[key] || key
+      }
+    })
+  }
+})
+
+function createStreamResponse(lines: string[]) {
+  const encoder = new TextEncoder()
+  const chunks = lines.map((line) => encoder.encode(line))
+  let index = 0
+
+  return {
+    ok: true,
+    body: {
+      getReader: () => ({
+        read: vi.fn().mockImplementation(async () => {
+          if (index < chunks.length) {
+            return { done: false, value: chunks[index++] }
+          }
+          return { done: true, value: undefined }
+        })
+      })
+    }
+  } as Response
+}
+
+function mountModal() {
+  return mount(AccountTestModal, {
+    props: {
+      show: false,
+      account: {
+        id: 42,
+        name: 'Gemini Image Test',
+        platform: 'gemini',
+        type: 'apikey',
+        status: 'active'
+      }
+    } as any,
+    global: {
+      stubs: {
+        BaseDialog: { template: '<div><slot /><slot name="footer" /></div>' },
+        Select: { template: '<div class="select-stub"></div>' },
+        TextArea: {
+          props: ['modelValue'],
+          emits: ['update:modelValue'],
+          template: '<textarea class="textarea-stub" :value="modelValue" @input="$emit(\'update:modelValue\', $event.target.value)" />'
+        },
+        Icon: true
+      }
+    }
+  })
+}
+
+describe('AccountTestModal', () => {
+  beforeEach(() => {
+    getAvailableModels.mockResolvedValue([
+      { id: 'gemini-2.5-flash-image', display_name: 'Gemini 2.5 Flash Image' }
+    ])
+    copyToClipboard.mockReset()
+    Object.defineProperty(globalThis, 'localStorage', {
+      value: {
+        getItem: vi.fn((key: string) => (key === 'auth_token' ? 'test-token' : null)),
+        setItem: vi.fn(),
+        removeItem: vi.fn(),
+        clear: vi.fn()
+      },
+      configurable: true
+    })
+    global.fetch = vi.fn().mockResolvedValue(
+      createStreamResponse([
+        'data: {"type":"test_start","model":"gemini-2.5-flash-image"}\n',
+        'data: {"type":"image","image_url":"data:image/png;base64,QUJD","mime_type":"image/png"}\n',
+        'data: {"type":"test_complete","success":true}\n'
+      ])
+    ) as any
+  })
+
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('gemini 图片模型测试会携带提示词并渲染图片预览', async () => {
+    const wrapper = mountModal()
+    await wrapper.setProps({ show: true })
+    await flushPromises()
+
+    const promptInput = wrapper.find('textarea.textarea-stub')
+    expect(promptInput.exists()).toBe(true)
+    await promptInput.setValue('draw a tiny orange cat astronaut')
+
+    const buttons = wrapper.findAll('button')
+    const startButton = buttons.find((button) => button.text().includes('admin.accounts.startTest'))
+    expect(startButton).toBeTruthy()
+
+    await startButton!.trigger('click')
+    await flushPromises()
+    await flushPromises()
+
+    expect(global.fetch).toHaveBeenCalledTimes(1)
+    const [, request] = (global.fetch as any).mock.calls[0]
+    expect(JSON.parse(request.body)).toEqual({
+      model_id: 'gemini-2.5-flash-image',
+      prompt: 'draw a tiny orange cat astronaut'
+    })
+
+    const preview = wrapper.find('img[alt="gemini-test-image-1"]')
+    expect(preview.exists()).toBe(true)
+    expect(preview.attributes('src')).toBe('data:image/png;base64,QUJD')
+  })
+})

frontend/src/i18n/locales/en.ts

@@ -2411,6 +2411,7 @@ export default {
       connectedToApi: 'Connected to API',
       usingModel: 'Using model: {model}',
       sendingTestMessage: 'Sending test message: "hi"',
+      sendingGeminiImageRequest: 'Sending Gemini image generation test request...',
       response: 'Response:',
       startTest: 'Start Test',
       testing: 'Testing...',
@@ -2422,6 +2423,13 @@ export default {
       selectTestModel: 'Select Test Model',
       testModel: 'Test model',
       testPrompt: 'Prompt: "hi"',
+      geminiImagePromptLabel: 'Image prompt',
+      geminiImagePromptPlaceholder: 'Example: Generate an orange cat astronaut sticker in pixel-art style on a solid background.',
+      geminiImagePromptDefault: 'Generate a cute orange cat astronaut sticker on a clean pastel background.',
+      geminiImageTestHint: 'When a Gemini image model is selected, this test sends a real image-generation request and previews the returned image below.',
+      geminiImageTestMode: 'Mode: Gemini image generation test',
+      geminiImagePreview: 'Generated images:',
+      geminiImageReceived: 'Received test image #{count}',
       soraUpstreamBaseUrlHint: 'Upstream Sora service URL (another Sub2API instance or compatible API)',
       soraTestHint: 'Sora test runs connectivity and capability checks (/backend/me, subscription, Sora2 invite and remaining quota).',
       soraTestTarget: 'Target: Sora account capability',

frontend/src/i18n/locales/zh.ts

@@ -2540,6 +2540,7 @@ export default {
       connectedToApi: '已连接到 API',
       usingModel: '使用模型：{model}',
       sendingTestMessage: '发送测试消息："hi"',
+      sendingGeminiImageRequest: '发送 Gemini 生图测试请求...',
       response: '响应：',
       startTest: '开始测试',
       retry: '重试',
@@ -2550,6 +2551,13 @@ export default {
       selectTestModel: '选择测试模型',
       testModel: '测试模型',
       testPrompt: '提示词："hi"',
+      geminiImagePromptLabel: '生图提示词',
+      geminiImagePromptPlaceholder: '例如：生成一只戴宇航员头盔的橘猫，像素插画风格，纯色背景。',
+      geminiImagePromptDefault: 'Generate a cute orange cat astronaut sticker on a clean pastel background.',
+      geminiImageTestHint: '选择 Gemini 图片模型后，这里会直接发起生图测试，并在下方展示返回图片。',
+      geminiImageTestMode: '模式：Gemini 生图测试',
+      geminiImagePreview: '生成结果：',
+      geminiImageReceived: '已收到第 {count} 张测试图片',
       soraUpstreamBaseUrlHint: '上游 Sora 服务地址（另一个 Sub2API 实例或兼容 API）',
       soraTestHint: 'Sora 测试将执行连通性与能力检测（/backend/me、订阅信息、Sora2 邀请码与剩余额度）。',
       soraTestTarget: '检测目标：Sora 账号能力',