diff --git a/webdriver/tests/bidi/emulation/set_locale_override/conftest.py b/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
index e687010128a470..d78cbb26562fac 100644
--- a/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
+++ b/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
@@ -55,3 +55,104 @@ def another_locale(default_locale, some_locale):
     raise Exception(
         f"Unexpectedly could not find locale different from the default {default_locale} and {some_locale}"
     )
+
+
+@pytest_asyncio.fixture
+async def get_current_navigator_language(bidi_session):
+    async def get_current_navigator_language(context, sandbox=None):
+        result = await bidi_session.script.evaluate(
+            expression="navigator.language",
+            target=ContextTarget(context["context"], sandbox=sandbox),
+            await_promise=False,
+        )
+
+        return result["value"]
+
+    return get_current_navigator_language
+
+
+@pytest_asyncio.fixture
+async def get_current_navigator_languages(bidi_session):
+    async def get_current_navigator_languages(context, sandbox=None):
+        result = await bidi_session.script.evaluate(
+            expression="navigator.languages",
+            target=ContextTarget(context["context"], sandbox=sandbox),
+            await_promise=False,
+        )
+
+        arr = []
+        for item in result["value"]:
+            arr.append(item["value"])
+
+        return arr
+
+    return get_current_navigator_languages
+
+
+@pytest_asyncio.fixture
+async def default_navigator_language(get_current_navigator_language, top_context):
+    """
+    Returns default navigator.language value.
+    """
+    return await get_current_navigator_language(top_context)
+
+
+@pytest_asyncio.fixture
+async def default_navigator_languages(get_current_navigator_languages, top_context):
+    """
+    Returns default navigator.languages value.
+    """
+    return await get_current_navigator_languages(top_context)
+
+
+@pytest_asyncio.fixture
+async def assert_locale_against_default(
+    get_current_locale,
+    get_current_navigator_language,
+    get_current_navigator_languages,
+    default_locale,
+    default_navigator_language,
+    default_navigator_languages,
+):
+    """
+    Assert JS locale and navigator.language/s against default values.
+
+    Note: it's possible to have slightly different values between JS locale and
+    navigator.language/s, that's why we have to retrieve the default values
+    for each API.
+    """
+
+    async def assert_locale_against_default(context):
+        assert await get_current_locale(context) == default_locale
+        assert (
+            await get_current_navigator_language(context) == default_navigator_language
+        )
+        assert (
+            await get_current_navigator_languages(context)
+            == default_navigator_languages
+        )
+
+    return assert_locale_against_default
+
+
+@pytest_asyncio.fixture
+async def assert_locale_against_value(
+    top_context,
+    get_current_locale,
+    get_current_navigator_language,
+    get_current_navigator_languages,
+):
+    """
+    Assert JS locale and navigator.language/s against provided value
+    """
+
+    async def assert_locale_against_value(value, context):
+        assert (
+            context != top_context
+        ), "Provided context should be different from top_context"
+
+        assert await get_current_locale(context) == value
+        assert await get_current_navigator_language(context) == value
+        assert await get_current_navigator_languages(context) == [value]
+
+    return assert_locale_against_value
diff --git a/webdriver/tests/bidi/emulation/set_locale_override/locale.py b/webdriver/tests/bidi/emulation/set_locale_override/locale.py
index 3da7f62f520082..05bedb73b35341 100644
--- a/webdriver/tests/bidi/emulation/set_locale_override/locale.py
+++ b/webdriver/tests/bidi/emulation/set_locale_override/locale.py
@@ -3,33 +3,34 @@
 pytestmark = pytest.mark.asyncio
 
 
-async def test_locale_set_override_and_reset(bidi_session, top_context,
-        get_current_locale, default_locale, some_locale, another_locale):
-    assert await get_current_locale(top_context) == default_locale
+async def test_locale_set_override_and_reset(bidi_session, new_tab,
+    some_locale, another_locale,
+    assert_locale_against_default, assert_locale_against_value):
+    await assert_locale_against_default(new_tab)
 
     # Set locale override.
     await bidi_session.emulation.set_locale_override(
-        contexts=[top_context["context"]],
+        contexts=[new_tab["context"]],
         locale=some_locale
     )
 
-    assert await get_current_locale(top_context) == some_locale
+    await assert_locale_against_value(some_locale, new_tab)
 
-    # Set locale override.
+    # Set another locale override.
     await bidi_session.emulation.set_locale_override(
-        contexts=[top_context["context"]],
+        contexts=[new_tab["context"]],
         locale=another_locale
     )
 
-    assert await get_current_locale(top_context) == another_locale
+    await assert_locale_against_value(another_locale, new_tab)
 
-    # Set locale override.
+    # Reset locale override.
     await bidi_session.emulation.set_locale_override(
-        contexts=[top_context["context"]],
+        contexts=[new_tab["context"]],
         locale=None
     )
 
-    assert await get_current_locale(top_context) == default_locale
+    await assert_locale_against_default(new_tab)
 
 
 @pytest.mark.parametrize("value", [