cherry-pick(#36227): fix: java style selector string

Signed-off-by: Dmitry Gozman <[email protected]>
Co-authored-by: Dmitry Gozman <[email protected]>

Author: Skn0tt

packages/playwright-core/src/server/dom.ts

@@ -86,7 +86,7 @@ export class FrameExecutionContext extends js.ExecutionContext {
       const customEngines: InjectedScriptOptions['customEngines'] = [];
       const selectorsRegistry = this.frame._page.browserContext.selectors();
       for (const [name, { source }] of selectorsRegistry._engines)
-        customEngines.push({ name, source });
+        customEngines.push({ name, source: `(${source})` });
       const sdkLanguage = this.frame.attribution.playwright.options.sdkLanguage;
       const options: InjectedScriptOptions = {
         isUnderTest: isUnderTest(),

tests/page/selectors-register.spec.ts

@@ -128,3 +128,17 @@ it('isVisible should be atomic', async ({ playwright, page }) => {
   expect(result).toBe(true);
   expect(await page.evaluate(() => document.querySelector('div').style.display)).toBe('none');
 });
+
+it('should take java-style string', async ({ playwright, page }) => {
+  const createDummySelector = `{
+    query(root, selector) {
+      return root.querySelector(selector);
+    },
+    queryAll(root, selector) {
+      return root.querySelectorAll(selector);
+    }
+  }`;
+  await playwright.selectors.register('objectLiteral', createDummySelector);
+  await page.setContent(`<div>Hello</div>`);
+  await page.textContent('objectLiteral=div');
+});