Add some bdd tests for zooming.

tests/integration/features/test_zoom.py

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+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2015 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_bdd as bdd
+bdd.scenarios('zoom.feature')

tests/integration/features/zoom.feature

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+Feature: Zooming in and out
+
+    Background:
+        Given I open data/hello.txt
+
+    Scenario: Zooming in
+        When I run :zoom-in
+        Then the message "Zoom level: 110%" should be shown.
+        And the session should look like:
+            windows:
+            - tabs:
+              - ...
+              - history:
+                - zoom: 1.1
+
+    Scenario: Zooming out
+        When I run :zoom-out
+        Then the message "Zoom level: 90%" should be shown.
+        And the session should look like:
+            windows:
+            - tabs:
+              - ...
+              - history:
+                - zoom: 0.9
+
+    Scenario: Setting zoom
+        When I run :zoom 50
+        Then the message "Zoom level: 50%" should be shown.
+        And the session should look like:
+            windows:
+            - tabs:
+              - ...
+              - history:
+                - zoom: 0.5
+
+    Scenario: Resetting zoom
+        When I run :zoom 50
+        And I run :zoom
+        Then the message "Zoom level: 100%" should be shown.
+        And the session should look like:
+            windows:
+            - tabs:
+              - ...
+              - history:
+                - zoom: 1.0