Vs/Add tests for seach modes persistance with @bing

tests/address_bar_and_search/test_search_mode_persists_mixed_with_bing.py

@@ -0,0 +1,44 @@
+import pytest
+from selenium.webdriver import Firefox
+from selenium.webdriver.common.keys import Keys
+
+from modules.browser_object_navigation import Navigation
+from modules.page_object_generics import GenericPage
+
+@pytest.fixture()
+def test_case():
+    return "3028730"
+
+@pytest.mark.parametrize("engine", ["DuckDuckGo"])
+def test_search_mode_persists_mixed_with_bing(driver: Firefox, engine):
+    """
+    TC 3028730: Ensure '@bing' is NOT recognized as a special Bing search when DuckDuckGo is selected.
+    """
+    # Open a neutral page (new tab) and prepare helpers
+    page = GenericPage(driver, url="about:newtab")
+    nav = Navigation(driver)
+
+    page.open()
+
+    # Step 1: pick DuckDuckGo from the search mode switcher (aka USB)
+    nav.click_search_mode_switcher()
+    nav.set_search_mode(engine)
+
+    # Step 2: type '@bing' in the Awesome Bar
+    nav.click_in_awesome_bar()
+    nav.type_in_awesome_bar("@bing")
+
+    # Assert that the "tab to search" / alias UI is NOT shown for '@bing'
+    nav.element_not_visible("tab-to-search-text-span")
+
+    # Step 3: continue typing any word and hit Enter
+    nav.type_in_awesome_bar(" test" + Keys.ENTER)
+
+    # Expectation: a DuckDuckGo results page, with '@bing' included as plain text in the query.
+    page.url_contains("duckduckgo.com")
+
+    # Verify '@bing' appears in the query (allowing for URL encoding)
+    current_url = driver.current_url
+    assert ("%40bing" in current_url) or ("@bing" in current_url), (
+        f"@bing should be part of the search term, but URL was: {current_url}"
+    )