diff --git a/content-scripts/text-injection-all-providers.js b/content-scripts/text-injection-all-providers.js
index 5152706..6a4acbc 100644
--- a/content-scripts/text-injection-all-providers.js
+++ b/content-scripts/text-injection-all-providers.js
@@ -172,9 +172,10 @@
     ],
     gemini: [
       'button[aria-label="Send message"]',
+      'button[aria-label="发送"]',
       'button.send-button',
       'button[mattooltip="Send message"]',
-      '.input-area-container button:has(mat-icon)',
+      '.input-area-container button:has(mat-icon[fonticon="arrow_upward"])',
       'button[aria-label="Submit"]'
     ],
     grok: [
diff --git a/tests/gemini-content-script.test.js b/tests/gemini-content-script.test.js
new file mode 100644
index 0000000..833a1af
--- /dev/null
+++ b/tests/gemini-content-script.test.js
@@ -0,0 +1,145 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const contentScriptSource = readFileSync(
+  resolve(process.cwd(), 'content-scripts/text-injection-all-providers.js'),
+  'utf8'
+);
+
+function markVisible(element) {
+  Object.defineProperty(element, 'offsetParent', {
+    configurable: true,
+    get: () => document.body,
+  });
+}
+
+function dispatchMultiPanelMessage(payload) {
+  window.dispatchEvent(new MessageEvent('message', { data: payload }));
+}
+
+const sampleImage = {
+  name: 'sample.png',
+  type: 'image/png',
+  dataUrl: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO2Z2ioAAAAASUVORK5CYII=',
+};
+
+function createGeminiDom({ sendLabel = '发送', sendDisabled = false, includeSend = true } = {}) {
+  document.body.innerHTML = `
+    <div class="input-area-container">
+      <div class="ql-editor" contenteditable="true" role="textbox"></div>
+      <button id="gemini-upload" type="button" aria-label="上传和工具">
+        <mat-icon fonticon="plus"></mat-icon>
+      </button>
+      ${includeSend ? `
+        <button id="gemini-send" type="button" aria-label="${sendLabel}">
+          <mat-icon fonticon="arrow_upward"></mat-icon>
+        </button>
+      ` : ''}
+    </div>
+  `;
+
+  const editor = document.querySelector('.ql-editor');
+  const uploadButton = document.getElementById('gemini-upload');
+  const sendButton = document.getElementById('gemini-send');
+
+  [editor, uploadButton, sendButton].filter(Boolean).forEach(markVisible);
+  if (sendButton) {
+    sendButton.disabled = sendDisabled;
+  }
+
+  return { editor, uploadButton, sendButton };
+}
+
+describe('Gemini content script integration', () => {
+  beforeAll(() => {
+    window.eval(contentScriptSource);
+  });
+
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.useRealTimers();
+    window.happyDOM.setURL('https://gemini.google.com/app');
+  });
+
+  it.each([
+    ['Chinese aria label', '发送'],
+    ['English aria label', 'Send message'],
+    ['locale-independent icon fallback', 'Envoyer'],
+  ])('clicks the Gemini send button using the %s', (_name, sendLabel) => {
+    const { uploadButton, sendButton } = createGeminiDom({ sendLabel });
+    const uploadClickSpy = vi.fn();
+    const sendClickSpy = vi.fn();
+    uploadButton.addEventListener('click', uploadClickSpy);
+    sendButton.addEventListener('click', sendClickSpy);
+
+    dispatchMultiPanelMessage({ type: 'TRIGGER_SEND', context: 'multi-panel' });
+
+    expect(sendClickSpy).toHaveBeenCalledTimes(1);
+    expect(uploadClickSpy).not.toHaveBeenCalled();
+  });
+
+  it('uses the verified Gemini send button after text auto-submit', async () => {
+    vi.useFakeTimers();
+    const { editor, uploadButton, sendButton } = createGeminiDom();
+    const uploadClickSpy = vi.fn();
+    const sendClickSpy = vi.fn();
+    uploadButton.addEventListener('click', uploadClickSpy);
+    sendButton.addEventListener('click', sendClickSpy);
+
+    dispatchMultiPanelMessage({
+      type: 'INJECT_TEXT',
+      text: 'hello gemini',
+      autoSubmit: true,
+      context: 'multi-panel',
+    });
+    await vi.advanceTimersByTimeAsync(500);
+
+    expect(editor.textContent).toContain('hello gemini');
+    expect(sendClickSpy).toHaveBeenCalledTimes(1);
+    expect(uploadClickSpy).not.toHaveBeenCalled();
+  });
+
+  it('keeps Gemini image injection on the editor paste and drop path', async () => {
+    vi.useFakeTimers();
+    const { editor, uploadButton, sendButton } = createGeminiDom();
+    const pasteSpy = vi.fn();
+    const dropSpy = vi.fn();
+    const uploadClickSpy = vi.fn();
+    const sendClickSpy = vi.fn();
+    editor.addEventListener('paste', pasteSpy);
+    editor.addEventListener('drop', dropSpy);
+    uploadButton.addEventListener('click', uploadClickSpy);
+    sendButton.addEventListener('click', sendClickSpy);
+
+    dispatchMultiPanelMessage({
+      type: 'INJECT_TEXT_WITH_IMAGES',
+      text: '',
+      images: [sampleImage],
+      autoSubmit: false,
+      context: 'multi-panel',
+    });
+    await vi.runAllTimersAsync();
+
+    expect(pasteSpy).toHaveBeenCalledTimes(1);
+    expect(dropSpy).toHaveBeenCalledTimes(1);
+    expect(uploadClickSpy).not.toHaveBeenCalled();
+    expect(sendClickSpy).not.toHaveBeenCalled();
+  });
+
+  it.each([
+    ['missing', { includeSend: false }],
+    ['disabled', { sendDisabled: true }],
+  ])('does not click the upload button when the send button is %s', (_name, options) => {
+    const { uploadButton, sendButton } = createGeminiDom(options);
+    const uploadClickSpy = vi.fn();
+    const sendClickSpy = vi.fn();
+    uploadButton.addEventListener('click', uploadClickSpy);
+    sendButton?.addEventListener('click', sendClickSpy);
+
+    dispatchMultiPanelMessage({ type: 'TRIGGER_SEND', context: 'multi-panel' });
+
+    expect(sendClickSpy).not.toHaveBeenCalled();
+    expect(uploadClickSpy).not.toHaveBeenCalled();
+  });
+});