2 files changed, 38 insertions, 1 deletions
diff --git a/testing/web-platform/mozilla/tests/webdriver/harness/preferences.py b/testing/web-platform/mozilla/tests/webdriver/harness/preferences_marionette.py
index b5cf36bd5e..e5d18aeb6b 100644
--- a/testing/web-platform/mozilla/tests/webdriver/harness/preferences.py
+++ b/testing/web-platform/mozilla/tests/webdriver/harness/preferences_marionette.py
@@ -2,5 +2,5 @@ from support.fixtures import get_pref
 
 
 def test_recommended_preferences(session):
-    has_recommended_prefs = get_pref(session, "remote.prefs.recommended")
+    has_recommended_prefs = get_pref(session, "remote.prefs.recommended.applied")
     assert has_recommended_prefs is True
diff --git a/testing/web-platform/mozilla/tests/webdriver/harness/preferences_remote_agent.py b/testing/web-platform/mozilla/tests/webdriver/harness/preferences_remote_agent.py
new file mode 100644
index 0000000000..59db5fa0e3
--- /dev/null
+++ b/testing/web-platform/mozilla/tests/webdriver/harness/preferences_remote_agent.py
@@ -0,0 +1,37 @@
+import pytest
+from support.helpers import read_user_preferences
+from tests.support.sync import Poll
+
+
+@pytest.mark.parametrize(
+    "value",
+    [
+        {"pref_value": 1, "use_cdp": False, "use_bidi": True},
+        {"pref_value": 2, "use_cdp": True, "use_bidi": False},
+        {"pref_value": 3, "use_cdp": True, "use_bidi": True},
+    ],
+    ids=["bidi only", "cdp only", "bidi and cdp"],
+)
+def test_remote_agent_recommended_preferences_applied(browser, value):
+    # Marionette cannot be enabled for this test because it will also set the
+    # recommended preferences. Therefore only enable Remote Agent protocols.
+    current_browser = browser(
+        extra_prefs={
+            "remote.active-protocols": value["pref_value"],
+        },
+        use_cdp=value["use_cdp"],
+        use_bidi=value["use_bidi"],
+    )
+
+    def pref_is_set(_):
+        preferences = read_user_preferences(current_browser.profile.profile, "prefs.js")
+        return preferences.get("remote.prefs.recommended.applied", False)
+
+    # Without Marionette enabled preferences cannot be retrieved via script evaluation yet.
+    wait = Poll(
+        None,
+        timeout=5,
+        ignored_exceptions=FileNotFoundError,
+        message="""Preference "remote.prefs.recommended.applied" is not true""",
+    )
+    wait.until(pref_is_set)