Add a fullscreen notification overlay

From the spec:

  User agents should ensure, e.g. by means of an overlay, that the end user is
  aware something is displayed fullscreen. User agents should provide a means of
  exiting fullscreen that always works and advertise this to the user. This is
  to prevent a site from spoofing the end user by recreating the user agent or
  even operating system environment when fullscreen.

https://fullscreen.spec.whatwg.org/#security-and-privacy-considerations

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/unit/misc/test_miscwidgets.py b/tests/unit/misc/test_miscwidgets.py
index 3e25d0080..dd17ac254 100644
--- a/tests/unit/misc/test_miscwidgets.py
+++ b/tests/unit/misc/test_miscwidgets.py
@@ -100,3 +100,26 @@ class TestWrapperLayout:
     def test_wrapped(self, container):
         assert container.wrapped.parent() is container
         assert container.focusProxy() is container.wrapped
+
+
+class TestFullscreenNotification:
+
+    @pytest.mark.parametrize('bindings, text', [
+        ({'<escape>': 'fullscreen --leave'},
+            "Press Escape to exit fullscreen."),
+        ({'<escape>': 'fullscreen'}, "Page is now fullscreen."),
+        ({'a': 'fullscreen --leave'}, "Press a to exit fullscreen."),
+        ({}, "Page is now fullscreen."),
+    ])
+    def test_text(self, qtbot, key_config_stub, bindings, text):
+        key_config_stub.set_bindings_for('normal', bindings)
+        w = miscwidgets.FullscreenNotification()
+        qtbot.add_widget(w)
+        assert w.text() == text
+
+    def test_timeout(self, qtbot, key_config_stub):
+        key_config_stub.set_bindings_for('normal', {})
+        w = miscwidgets.FullscreenNotification()
+        qtbot.add_widget(w)
+        with qtbot.waitSignal(w.destroyed):
+            w.set_timeout(1)