diff --git a/scripts/dev/check_coverage.py b/scripts/dev/check_coverage.py
index e4eb71d24..863cf40e1 100644
--- a/scripts/dev/check_coverage.py
+++ b/scripts/dev/check_coverage.py
@@ -37,6 +37,7 @@ PERFECT_FILES = [
     'qutebrowser/commands/cmdutils.py',
     'qutebrowser/commands/argparser.py',
 
+    'qutebrowser/browser/cookies.py',
     'qutebrowser/browser/tabhistory.py',
     'qutebrowser/browser/http.py',
     'qutebrowser/browser/rfc6266.py',
diff --git a/tests/helpers/stubs.py b/tests/helpers/stubs.py
index 59eba35d3..54b2b3142 100644
--- a/tests/helpers/stubs.py
+++ b/tests/helpers/stubs.py
@@ -324,11 +324,6 @@ class ConfigStub(QObject):
     def __getitem__(self, name):
         return self.section(name)
 
-    def __setattr__(self, name, value):
-        if name == 'data':
-            self.changed.emit('', '')
-        super().__setattr__(name, value)
-
     def section(self, name):
         """Get a section from the config.
 
@@ -348,6 +343,15 @@ class ConfigStub(QObject):
         except KeyError:
             raise configexc.NoOptionError(opt, sect)
 
+    def set(self, sect, opt, value):
+        """Set a value in the config."""
+        data = self.data[sect]
+        try:
+            data[opt] = value
+            self.changed.emit(sect, opt)
+        except KeyError:
+            raise configexc.NoOptionError(opt, sect)
+
 
 class KeyConfigStub:
 
diff --git a/tests/unit/browser/test_cookies.py b/tests/unit/browser/test_cookies.py
index d5efbcc18..235aa6378 100644
--- a/tests/unit/browser/test_cookies.py
+++ b/tests/unit/browser/test_cookies.py
@@ -33,7 +33,6 @@ from qutebrowser.misc import lineparser
 CONFIG_ALL_COOKIES = {'content': {'cookies-accept': 'all'}}
 CONFIG_NEVER_COOKIES = {'content': {'cookies-accept': 'never'}}
 CONFIG_COOKIES_ENABLED = {'content': {'cookies-store': True}}
-CONFIG_COOKIES_DISABLED = {'content': {'cookies-store': False}}
 
 
 cookie1 = b'foo1=bar; expires=Tue, 01-Jan-2036 08:00:01 GMT'
@@ -62,8 +61,6 @@ def fake_save_manager():
     yield
     objreg.delete('save-manager')
 
-"""Tests for RAMCookieJar."""
-
 
 def test_set_cookies_accept(config_stub, qtbot, monkeypatch):
     """Test setCookiesFromUrl with cookies enabled."""
@@ -110,7 +107,10 @@ def test_purge_old_cookies(config_stub, fake_save_manager):
     jar = cookies.CookieJar(line_parser=line_parser_stub)
 
     assert len(jar.allCookies()) == 4
+
     jar.purge_old_cookies()
+
+    # Test that old cookies are gone
     assert len(jar.allCookies()) == 3
     assert jar.allCookies()[0].toRawForm().data() == cookie1
     assert jar.allCookies()[1].toRawForm().data() == cookie2
@@ -125,7 +125,7 @@ def test_save(config_stub, fake_save_manager, monkeypatch):
     jar = cookies.CookieJar()
     jar._lineparser.data = [cookie1, cookie2, session_cookie, expired_cookie]
 
-    # update the cookies on the jar itself
+    # Update the cookies on the jar itself
     jar.parse_cookies()
     jar.save()
     assert len(jar._lineparser.saved) == 2
@@ -139,10 +139,11 @@ def test_cookies_changed(config_stub, fake_save_manager, monkeypatch, qtbot):
     monkeypatch.setattr(lineparser,
                         'LineParser', LineparserSaveStub)
     jar = cookies.CookieJar()
+    jar._lineparser.data = [cookie1, cookie2]
 
-    # Test that signal is emitted
+    # Test that cookies are not saved
     with qtbot.waitSignal(jar.changed, raising=True):
-        config_stub.data == CONFIG_COOKIES_DISABLED
+        config_stub.set('content', 'cookies-store', False)
 
-    # test that cookies aren't saved
+    # Test that cookies are not saved
     assert len(jar._lineparser.saved) == 0