diff --git a/.flake8 b/.flake8
index d967a505b..14fd08034 100644
--- a/.flake8
+++ b/.flake8
@@ -42,6 +42,8 @@ putty-ignore =
     tests/helpers/fixtures.py : +N806
     tests/unit/browser/webkit/http/test_content_disposition.py : +D400
     scripts/dev/ci/appveyor_install.py : +FI53
+    # FIXME:conf
+    tests/unit/completion/test_models.py : +F821
 copyright-check = True
 copyright-regexp = # Copyright [\d-]+ .*
 copyright-min-file-size = 110
diff --git a/scripts/dev/src2asciidoc.py b/scripts/dev/src2asciidoc.py
index df561567c..09e083e79 100755
--- a/scripts/dev/src2asciidoc.py
+++ b/scripts/dev/src2asciidoc.py
@@ -356,9 +356,33 @@ def generate_commands(filename):
             f.write(_get_command_doc(name, cmd))
 
 
+def _generate_setting_backend_info(f, opt):
+    """"Generate backend information for the given option."""
+    all_backends = [usertypes.Backend.QtWebKit, usertypes.Backend.QtWebEngine]
+    if opt.raw_backends is not None:
+        for name, conditional in sorted(opt.raw_backends.items()):
+            if conditional is True:
+                pass
+            elif conditional is False:
+                f.write("\nOn {}, this setting is unavailable.\n".format(name))
+            else:
+                f.write("\nOn {}, this setting requires {} or newer.\n"
+                        .format(name, conditional))
+    elif opt.backends == all_backends:
+        pass
+    elif opt.backends == [usertypes.Backend.QtWebKit]:
+        f.write("\nThis setting is only available with the QtWebKit "
+                "backend.\n")
+    elif opt.backends == [usertypes.Backend.QtWebEngine]:
+        f.write("\nThis setting is only available with the QtWebEngine "
+                "backend.\n")
+    else:
+        raise ValueError("Invalid value {!r} for opt.backends"
+                         .format(opt.backends))
+
+
 def _generate_setting_option(f, opt):
     """Generate documentation for a single section."""
-
     f.write("\n")
     f.write('[[{}]]'.format(opt.name) + "\n")
     f.write("== {}".format(opt.name) + "\n")
@@ -386,27 +410,7 @@ def _generate_setting_option(f, opt):
     else:
         f.write("Default: empty\n")
 
-    all_backends = [usertypes.Backend.QtWebKit, usertypes.Backend.QtWebEngine]
-    if opt.raw_backends is not None:
-        for name, conditional in sorted(opt.raw_backends.items()):
-            if conditional is True:
-                pass
-            elif conditional is False:
-                f.write("\nOn {}, this setting is unavailable.\n".format(name))
-            else:
-                f.write("\nOn {}, this setting requires {} or newer.\n"
-                        .format(name, conditional))
-    elif opt.backends == all_backends:
-        pass
-    elif opt.backends == [usertypes.Backend.QtWebKit]:
-        f.write("\nThis setting is only available with the QtWebKit "
-                "backend.\n")
-    elif opt.backends == [usertypes.Backend.QtWebEngine]:
-        f.write("\nThis setting is only available with the QtWebEngine "
-                "backend.\n")
-    else:
-        raise ValueError("Invalid value {!r} for opt.backends"
-                         .format(opt.backends))
+    _generate_setting_backend_info(f, opt)
 
 
 def generate_settings(filename):
diff --git a/tests/helpers/stubs.py b/tests/helpers/stubs.py
index 82b88dd74..fb1232396 100644
--- a/tests/helpers/stubs.py
+++ b/tests/helpers/stubs.py
@@ -389,6 +389,8 @@ class InstaTimer(QObject):
 
 class FakeYamlConfig:
 
+    """Fake configfiles.YamlConfig object."""
+
     def __init__(self):
         self.values = {}
         self.loaded = False
diff --git a/tests/unit/config/test_config.py b/tests/unit/config/test_config.py
index 1a67ed5fb..b365914f7 100644
--- a/tests/unit/config/test_config.py
+++ b/tests/unit/config/test_config.py
@@ -275,14 +275,14 @@ class TestSetConfigCommand:
         objreg.delete('tabbed-browser', scope='window', window=0)
 
     def test_set_no_args(self, commands, tabbed_browser):
-        """:set
+        """Run ':set'.
 
         Should open qute://settings."""
         commands.set(win_id=0)
         assert tabbed_browser.opened_url == QUrl('qute://settings')
 
     def test_get(self, config_stub, commands, message_mock):
-        """:set url.auto_search?
+        """Run ':set url.auto_search?'.
 
         Should show the value.
         """
@@ -293,7 +293,7 @@ class TestSetConfigCommand:
 
     @pytest.mark.parametrize('temp', [True, False])
     def test_set_simple(self, monkeypatch, commands, config_stub, temp):
-        """:set [-t] url.auto_search dns
+        """Run ':set [-t] url.auto_search dns'.
 
         Should set the setting accordingly.
         """
@@ -326,7 +326,7 @@ class TestSetConfigCommand:
         assert config_stub._yaml.values['url.auto_search'] == 'dns'
 
     def test_set_print(self, config_stub, commands, message_mock):
-        """:set -p url.auto_search never
+        """Run ':set -p url.auto_search never'.
 
         Should set show the value.
         """
@@ -338,7 +338,7 @@ class TestSetConfigCommand:
         assert msg.text == 'url.auto_search = dns'
 
     def test_set_toggle(self, commands, config_stub):
-        """:set auto_save.config!
+        """Run ':set auto_save.config!'.
 
         Should toggle the value.
         """
@@ -348,7 +348,7 @@ class TestSetConfigCommand:
         assert not config_stub._yaml.values['auto_save.config']
 
     def test_set_toggle_nonbool(self, commands, config_stub):
-        """:set url.auto_search!
+        """Run ':set url.auto_search!'.
 
         Should show an error
         """
@@ -359,7 +359,7 @@ class TestSetConfigCommand:
         assert config_stub.val.url.auto_search == 'naive'
 
     def test_set_toggle_print(self, commands, config_stub, message_mock):
-        """:set -p auto_save.config!
+        """Run ':set -p auto_save.config!'.
 
         Should toggle the value and show the new value.
         """
@@ -368,7 +368,7 @@ class TestSetConfigCommand:
         assert msg.text == 'auto_save.config = false'
 
     def test_set_invalid_option(self, commands):
-        """:set foo bar
+        """Run ':set foo bar'.
 
         Should show an error.
         """
@@ -376,7 +376,7 @@ class TestSetConfigCommand:
             commands.set(0, 'foo', 'bar')
 
     def test_set_invalid_value(self, commands):
-        """:set auto_save.config blah
+        """Run ':set auto_save.config blah'.
 
         Should show an error.
         """
@@ -394,7 +394,7 @@ class TestSetConfigCommand:
 
     @pytest.mark.parametrize('option', ['?', '!', 'url.auto_search'])
     def test_empty(self, commands, option):
-        """:set ? / :set ! / :set url.auto_search
+        """Run ':set ?' / ':set !' / ':set url.auto_search'.
 
         Should show an error.
         See https://github.com/qutebrowser/qutebrowser/issues/1109
@@ -406,7 +406,7 @@ class TestSetConfigCommand:
 
     @pytest.mark.parametrize('suffix', '?!')
     def test_invalid(self, commands, suffix):
-        """:set foo? / :set foo!
+        """Run ':set foo?' / ':set foo!'.
 
         Should show an error.
         """
@@ -422,7 +422,7 @@ class TestSetConfigCommand:
         ('red', 'green'),
     ])
     def test_cycling(self, commands, config_stub, initial, expected):
-        """:set with multiple values."""
+        """Run ':set' with multiple values."""
         opt = 'colors.statusbar.normal.bg'
         config_stub.set_obj(opt, initial)
         commands.set(0, opt, 'green', 'magenta', 'blue', 'yellow')
@@ -472,7 +472,7 @@ class TestBindConfigCommand:
     ])
     def test_bind_print(self, commands, config_stub, message_mock,
                         key, mode, expected):
-        """:bind key
+        """Run ':bind key'.
 
         Should print the binding.
         """
@@ -500,7 +500,7 @@ class TestBindConfigCommand:
         ('nop', 'wrongmode', "bind: Invalid mode wrongmode!"),
     ])
     def test_bind_invalid(self, commands, command, mode, expected):
-        """:bind a foobar / :bind a completion-item-del
+        """Run ':bind a foobar' / ':bind a completion-item-del'.
 
         Should show an error.
         """
@@ -510,7 +510,7 @@ class TestBindConfigCommand:
     @pytest.mark.parametrize('force', [True, False])
     @pytest.mark.parametrize('key', ['a', 'b', '<Ctrl-X>'])
     def test_bind_duplicate(self, commands, config_stub, keyconf, force, key):
-        """:bind a key which already has been bound.
+        """Run ':bind' with a key which already has been bound.'.
 
         Also tests for https://github.com/qutebrowser/qutebrowser/issues/1544
         """
@@ -566,7 +566,7 @@ class TestBindConfigCommand:
         ('x', 'wrongmode', "unbind: Invalid mode wrongmode!"),
     ])
     def test_unbind_invalid(self, commands, key, mode, expected):
-        """:unbind foobar / :unbind x wrongmode
+        """Run ':unbind foobar' / ':unbind x wrongmode'.
 
         Should show an error.
         """
diff --git a/tests/unit/config/test_configtypes.py b/tests/unit/config/test_configtypes.py
index 33ddaec95..677045a60 100644
--- a/tests/unit/config/test_configtypes.py
+++ b/tests/unit/config/test_configtypes.py
@@ -1566,8 +1566,7 @@ class TestFile:
         os_mock.path.isabs.return_value = True
         assert klass().to_py('$HOME/foobar') == '/home/foo/foobar'
 
-    def test_to_py_invalid_encoding(self, klass, os_mock,
-                                      unicode_encode_err):
+    def test_to_py_invalid_encoding(self, klass, os_mock, unicode_encode_err):
         """Test to_py with an invalid encoding, e.g. LC_ALL=C."""
         os_mock.path.isfile.side_effect = unicode_encode_err
         os_mock.path.isabs.side_effect = unicode_encode_err
diff --git a/tests/unit/mainwindow/test_prompt.py b/tests/unit/mainwindow/test_prompt.py
index 8e0470f6b..76886d340 100644
--- a/tests/unit/mainwindow/test_prompt.py
+++ b/tests/unit/mainwindow/test_prompt.py
@@ -32,6 +32,7 @@ class TestFileCompletion:
     def get_prompt(self, qtbot, config_stub, key_config_stub):
         """Get a function to display a prompt with a path."""
         config_stub.val.bindings.default = {}
+
         def _get_prompt_func(path):
             question = usertypes.Question()
             question.title = "test"