Add a test for setting content.cache.size to a big value

tests/unit/browser/webengine/test_webenginesettings.py

@@ -0,0 +1,36 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2017 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+import pytest
+
+from qutebrowser.browser.webengine import webenginesettings
+
+
+@pytest.fixture(autouse=True)
+def init_profiles(qapp, config_stub, cache_tmpdir, data_tmpdir):
+    webenginesettings._init_profiles()
+
+
+def test_big_cache_size(config_stub):
+    """Make sure a too big cache size is handled correctly."""
+    config_stub.val.content.cache.size = 2 ** 63 - 1
+    webenginesettings._update_settings('content.cache.size')
+
+    size = webenginesettings.default_profile.httpCacheMaximumSize()
+    assert size == 2 ** 31 - 1