feat: 增强内容脚本加载逻辑，优化错误处理和测试用例

tests/content-utils.test.js

@@ -92,3 +92,16 @@ return { shouldReportReadyForFrame };
   assert.equal(api.shouldReportReadyForFrame('plus-checkout', false), true);
   assert.equal(api.shouldReportReadyForFrame('paypal-flow', true), true);
 });
+
+test('getRuntimeScriptSource follows injected source overrides after utils is already loaded', () => {
+  const bundle = [extractFunction('getRuntimeScriptSource')].join('\n');
+  const api = new Function('window', 'SCRIPT_SOURCE', `
+${bundle}
+return { getRuntimeScriptSource };
+`);
+
+  const windowRef = {};
+  assert.equal(api(windowRef, 'chatgpt').getRuntimeScriptSource(), 'chatgpt');
+  windowRef.__MULTIPAGE_SOURCE = 'plus-checkout';
+  assert.equal(api(windowRef, 'chatgpt').getRuntimeScriptSource(), 'plus-checkout');
+});

tests/plus-checkout-create-wait.test.js

@@ -25,7 +25,10 @@ test('Plus checkout create does not wait 20 seconds after opening checkout page'
     ensureContentScriptReadyOnTabUntilStopped: async () => {
       events.push({ type: 'ready' });
     },
-    reuseOrCreateTab: async () => 42,
+    reuseOrCreateTab: async (source, url, options) => {
+      events.push({ type: 'reuse-tab', source, url, options });
+      return 42;
+    },
     sendTabMessageUntilStopped: async () => ({
       checkoutUrl: 'https://checkout.stripe.com/c/pay/session',
       country: 'US',
@@ -44,6 +47,11 @@ test('Plus checkout create does not wait 20 seconds after opening checkout page'
 
   await executor.executePlusCheckoutCreate();
 
+  const reuseEvent = events.find((event) => event.type === 'reuse-tab');
+  assert.equal(reuseEvent.source, 'plus-checkout');
+  assert.equal(reuseEvent.options.reloadIfSameUrl, false);
+  assert.equal(Object.hasOwn(reuseEvent.options, 'inject'), false);
+
   const sleepEvents = events.filter((event) => event.type === 'sleep');
   assert.deepStrictEqual(sleepEvents.map((event) => event.ms), [1000, 1000]);