Stabilize some tests

tests/end2end/features/marks.feature

@@ -70,7 +70,7 @@ Feature: Setting positional marks
         And I run :jump-mark b
         Then the error "Mark b is not set" should be shown
 
-    @qtwebengine_todo: Does not emit loaded signal for fragments?
+    @qtwebengine_todo: Does not emit loaded signal for fragments? @flaky
     Scenario: Jumping to a local mark after changing fragments
         When I open data/marks.html#top
         And I run :scroll 'top'

tests/unit/misc/test_guiprocess.py

@@ -205,8 +205,7 @@ def test_exit_unsuccessful_output(qtbot, proc, caplog, py_proc, stream):
                 print("test", file=sys.{})
                 sys.exit(1)
             """.format(stream)))
-    assert len(caplog.records) == 2
-    assert caplog.records[1].msg == 'Process {}:\ntest'.format(stream)
+    assert caplog.records[-1].msg == 'Process {}:\ntest'.format(stream)
 
 
 @pytest.mark.parametrize('stream', ['stdout', 'stderr'])