diff --git a/tests/__init__.py b/tests/__init__.py
index afddb20..8df5d95 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,4 +1,3 @@
 import bumblebee_status.discover
 
 bumblebee_status.discover.discover()
-
diff --git a/tests/core/test_config.py b/tests/core/test_config.py
index 774b806..762c674 100644
--- a/tests/core/test_config.py
+++ b/tests/core/test_config.py
@@ -3,10 +3,12 @@ import pytest
 
 import core.config
 
+
 @pytest.fixture
 def defaultConfig():
     return core.config.Config([])
 
+
 def test_module():
     modules = ["module-1", "module-2", "module-3"]
 
@@ -14,6 +16,7 @@ def test_module():
 
     assert cfg.modules() == modules
 
+
 def test_module_ordering_maintained():
     modules = ["module-1", "module-5", "module-7"]
     more_modules = ["module-0", "module-2", "aaa"]
@@ -22,37 +25,45 @@ def test_module_ordering_maintained():
 
     assert cfg.modules() == modules + more_modules
 
+
 def test_default_interval(defaultConfig):
     assert defaultConfig.interval() == 1
 
+
 def test_interval():
     interval = 4
     cfg = core.config.Config(["-p", "interval={}".format(interval)])
 
     assert cfg.interval() == interval
 
+
 def test_floating_interval():
     interval = 4.5
     cfg = core.config.Config(["-p", "interval={}".format(interval)])
 
     assert cfg.interval() == interval
 
+
 def test_default_theme(defaultConfig):
     assert defaultConfig.theme() == "default"
 
+
 def test_theme():
     theme_name = "sample-theme"
     cfg = core.config.Config(["-t", theme_name])
     assert cfg.theme() == theme_name
 
+
 def test_default_iconset(defaultConfig):
     assert defaultConfig.iconset() == "auto"
 
+
 def test_iconset():
     iconset_name = "random-iconset"
     cfg = core.config.Config(["-i", iconset_name])
     assert cfg.iconset() == iconset_name
 
+
 def test_reverse(defaultConfig):
     assert defaultConfig.reverse() == False
 
@@ -60,6 +71,7 @@ def test_reverse(defaultConfig):
 
     assert cfg.reverse() == True
 
+
 def test_logfile(defaultConfig):
     assert defaultConfig.logfile() is None
 
@@ -68,7 +80,6 @@ def test_logfile(defaultConfig):
     assert cfg.logfile() == logfile
 
 
-
 def test_all_modules():
     modules = core.config.all_modules()
     assert len(modules) > 0
@@ -84,8 +95,10 @@ def test_all_modules():
                 "modules",
             )
         )
-    assert os.path.exists(os.path.join(base, "contrib", pyname)) \
-        or os.path.exists(os.path.join(base, "core", pyname))
+    assert os.path.exists(os.path.join(base, "contrib", pyname)) or os.path.exists(
+        os.path.join(base, "core", pyname)
+    )
+
 
 def test_list_output(mocker):
     mocker.patch("core.config.sys")
@@ -93,10 +106,13 @@ def test_list_output(mocker):
     cfg = core.config.Config(["-l", "modules"])
     cfg = core.config.Config(["-l", "modules-rst"])
 
+
 def test_missing_parameter():
     cfg = core.config.Config(["-p", "test.key"])
 
     assert cfg.get("test.key") == None
     assert cfg.get("test.key", "no-value-set") == "no-value-set"
+
+
 #
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/tests/core/test_decorators.py b/tests/core/test_decorators.py
index 25f8b9c..976ad0a 100644
--- a/tests/core/test_decorators.py
+++ b/tests/core/test_decorators.py
@@ -5,6 +5,7 @@ import core.widget
 import core.module
 import core.config
 
+
 @pytest.fixture
 def module():
     class TestModule(core.module.Module):
@@ -17,28 +18,34 @@ def module():
         @core.decorators.scrollable
         def get(self, widget):
             return self.text
+
     module = TestModule()
     module.set("scrolling.width", 10)
     return module
 
+
 def test_never(module):
     assert module.parameter("interval") == "never"
 
+
 def test_no_text(module):
     assert module.text == ""
     assert module.get(module.widget()) == ""
 
+
 def test_smaller(module):
     module.text = "test"
     assert module.parameter("scrolling.width") > len(module.text)
     assert module.get(module.widget()) == module.text
 
+
 def test_bigger(module):
     module.text = "this is a really really long sample text"
     maxwidth = module.parameter("scrolling.width")
     assert maxwidth < len(module.text)
     assert module.get(module.widget()) == module.text[:maxwidth]
 
+
 def test_bounce(module):
     module.text = "abcd"
     module.set("scrolling.width", 2)
@@ -52,6 +59,7 @@ def test_bounce(module):
     assert module.get(module.widget()) == "bc"
     assert module.get(module.widget()) == "ab"
 
+
 def test_nobounce(module):
     module.set("scrolling.bounce", False)
     module.set("scrolling.width", 2)
@@ -64,6 +72,7 @@ def test_nobounce(module):
     assert module.get(module.widget()) == "bc"
     assert module.get(module.widget()) == "cd"
 
+
 def test_completely_changed_data(module):
     module.text = "abcd"
     module.set("scrolling.width", 2)
@@ -75,6 +84,7 @@ def test_completely_changed_data(module):
     assert module.get(module.widget()) == "wx"
     assert module.get(module.widget()) == "xy"
 
+
 def test_slightly_changed_data(module):
     module.text = "this is a sample song (0:00)"
     module.set("scrolling.width", 10)
@@ -89,6 +99,7 @@ def test_slightly_changed_data(module):
     module.text = "this is a different song (0:13)"
     assert module.get(module.widget()) == module.text[0:10]
 
+
 def test_n_plus_one(module):
     module.text = "10 letters"
     module.set("scrolling.width", 9)
diff --git a/tests/core/test_event.py b/tests/core/test_event.py
index b64478f..b082e77 100644
--- a/tests/core/test_event.py
+++ b/tests/core/test_event.py
@@ -2,9 +2,10 @@ import pytest
 
 import core.event
 
+
 @pytest.fixture
 def someEvent():
-    class Event():
+    class Event:
         def __init__(self):
             core.event.clear()
             self.id = "some event"
@@ -32,6 +33,7 @@ def test_simple_callback(someEvent):
 
     assert someEvent.called == 2
 
+
 def test_args_callback(someEvent):
     core.event.register(someEvent.id, someEvent.callback, "a", "b")
     core.event.trigger(someEvent.id)
@@ -40,6 +42,7 @@ def test_args_callback(someEvent):
     assert len(someEvent.call_args) == 1
     assert someEvent.call_args[0] == ["a", "b"]
 
+
 def test_kwargs_callback(someEvent):
     core.event.register(
         someEvent.id, someEvent.callback, "a", "b", key1="test", key2="another"
@@ -50,7 +53,8 @@ def test_kwargs_callback(someEvent):
     assert len(someEvent.call_args) == 1
     assert someEvent.call_args[0] == ["a", "b"]
     assert len(someEvent.call_kwargs) == 1
-    assert someEvent.call_kwargs[0] == { "key1": "test", "key2": "another" }
+    assert someEvent.call_kwargs[0] == {"key1": "test", "key2": "another"}
+
 
 def test_arg_trigger(someEvent):
     core.event.register(someEvent.id, someEvent.callback)
@@ -60,6 +64,7 @@ def test_arg_trigger(someEvent):
     assert len(someEvent.call_args) == 1
     assert someEvent.call_args[0] == ["a", "b"]
 
+
 def test_kwargs_trigger(someEvent):
     core.event.register(someEvent.id, someEvent.callback)
     core.event.trigger(someEvent.id, "a", "c", key1="test", key2="something")
@@ -68,6 +73,7 @@ def test_kwargs_trigger(someEvent):
     assert len(someEvent.call_args) == 1
     assert someEvent.call_args[0] == ["a", "c"]
     assert len(someEvent.call_kwargs) == 1
-    assert someEvent.call_kwargs[0] == { "key1": "test", "key2": "something" }
+    assert someEvent.call_kwargs[0] == {"key1": "test", "key2": "something"}
+
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/tests/core/test_output.py b/tests/core/test_output.py
index 69c8b15..fcd9e22 100644
--- a/tests/core/test_output.py
+++ b/tests/core/test_output.py
@@ -10,43 +10,44 @@ import core.module
 class SampleModule(core.module.Module):
     pass
 
+
 @pytest.fixture(autouse=True)
 def clear_events():
     core.event.clear()
 
+
 @pytest.fixture
 def i3():
     return core.output.i3()
 
+
 @pytest.fixture
 def module_a(mocker):
     widget = mocker.MagicMock()
     widget.full_text.return_value = "test"
-    return SampleModule(
-        config=core.config.Config([]), widgets=[widget, widget, widget]
-    )
+    return SampleModule(config=core.config.Config([]), widgets=[widget, widget, widget])
+
 
 @pytest.fixture
 def paddedTheme():
     return core.theme.Theme(raw_data={"defaults": {"padding": " "}})
 
+
 @pytest.fixture
 def separatorTheme():
     return core.theme.Theme(
-        raw_data={
-            "defaults": {"separator": "***", "fg": "red", "bg": "blue"}
-        }
+        raw_data={"defaults": {"separator": "***", "fg": "red", "bg": "blue"}}
     )
 
+
 @pytest.fixture
 def block_a(separatorTheme, module_a):
     return core.output.block(
-        theme=separatorTheme,
-        module=module_a,
-        widget=module_a.widget(),
+        theme=separatorTheme, module=module_a, widget=module_a.widget(),
     )
 
-#def setUp(self):
+
+# def setUp(self):
 #    self.i3 = core.output.i3()
 #    widget = unittest.mock.MagicMock()
 #    widget.full_text.return_value = "test"
@@ -63,21 +64,26 @@ def test_start(i3):
     assert data["click_events"] == True
     assert all_data["suffix"] == "\n["
 
+
 def test_stop(i3):
     assert i3.stop()["suffix"] == "\n]"
 
+
 def test_no_modules_by_default(i3):
     assert i3.modules() == []
 
+
 def test_register_single_module(i3, module_a):
     i3.modules(module_a)
 
     assert i3.modules() == [module_a]
 
+
 def test_register_multiple_modules(i3, module_a):
     i3.modules([module_a, module_a, module_a])
     assert i3.modules() == [module_a, module_a, module_a]
 
+
 def test_draw_existing_module(mocker, i3):
     i3.test_draw = mocker.MagicMock(
         return_value={"blocks": {"test": True}, "suffix": "end"}
@@ -85,31 +91,34 @@ def test_draw_existing_module(mocker, i3):
     i3.draw("test_draw")
     i3.test_draw.assert_called_once_with()
 
+
 def test_empty_status_line(i3):
     data = i3.statusline()
 
     assert data["blocks"] == []
     assert data["suffix"] == ","
 
+
 def test_statusline(i3, module_a):
     i3.modules([module_a, module_a, module_a])
     i3.update()
     data = i3.statusline()
-    assert len(data["blocks"]) == len(module_a.widgets())*3
+    assert len(data["blocks"]) == len(module_a.widgets()) * 3
+
 
 def test_padding(i3, paddedTheme, module_a):
     i3.theme(paddedTheme)
-    blk = core.output.block(
-        i3.theme(), module_a, module_a.widget()
-    )
+    blk = core.output.block(i3.theme(), module_a, module_a.widget())
     blk.set("full_text", "abc")
     result = blk.dict()["full_text"]
     assert result == " abc "
 
+
 def test_no_separator(i3, module_a):
     result = i3.separator_block(module_a, module_a.widget())
     assert result == []
 
+
 def test_separator(i3, separatorTheme, module_a):
     i3.theme(separatorTheme)
     result = i3.separator_block(module_a, module_a.widget())
@@ -119,12 +128,14 @@ def test_separator(i3, separatorTheme, module_a):
     assert result[0].dict().get("_decorator") == True
     assert result[0].dict()["color"] == separatorTheme.get("bg", module_a.widget())
 
+
 def test_dump_json(mocker):
     obj = mocker.MagicMock()
     obj.dict = mocker.MagicMock()
     core.output.dump_json(obj)
     obj.dict_assert_called_once_with()
 
+
 def test_assign():
     src = {"a": "x", "b": "y", "c": "z"}
     dst = {}
@@ -138,29 +149,31 @@ def test_assign():
     core.output.assign(src, dst, "blub", default="def")
     assert dst["blub"] == "def"
 
+
 def test_pango_detection(block_a):
     assert block_a.is_pango({}) == False
-    assert block_a.is_pango({ "pango": {} }) == True
+    assert block_a.is_pango({"pango": {}}) == True
+
 
 def test_pangoize(block_a):
     assert block_a.pangoize("test") == "test"
     assert not "markup" in block_a.dict()
 
-    pango = block_a.pangoize(
-        {"pango": {"attr": "blub", "x": "y", "full_text": "test"}}
-    )
+    pango = block_a.pangoize({"pango": {"attr": "blub", "x": "y", "full_text": "test"}})
     assert 'attr="blub"' in pango
     assert 'x="y"' in pango
     assert "<span " in pango
     assert ">test</span>" in pango
     assert block_a.dict()["markup"] == "pango"
 
+
 def test_padding(block_a):
     block_a.set("padding", "***")
     block_a.set("full_text", "test")
 
     assert block_a.dict()["full_text"] == "***test***"
 
+
 def test_pre_suffix(block_a):
     block_a.set("padding", "*")
     block_a.set("prefix", "pre")
diff --git a/tests/core/test_theme.py b/tests/core/test_theme.py
index 1ec1799..5f4f931 100644
--- a/tests/core/test_theme.py
+++ b/tests/core/test_theme.py
@@ -12,14 +12,17 @@ class SampleModule(core.module.Module):
         super().__init__(config, theme, widgets)
         self.name = "test"
 
+
 @pytest.fixture(autouse=True)
 def clear_events():
     core.event.clear()
 
+
 @pytest.fixture
 def defaultsTheme():
     return {"defaults": {"fg": "red", "bg": "black"}}
 
+
 @pytest.fixture
 def cycleTheme():
     return {
@@ -30,22 +33,27 @@ def cycleTheme():
         ]
     }
 
+
 @pytest.fixture
 def colorTheme():
     return {"colors": [{"red": "#ff0000", "blue": "#0000ff"}]}
 
+
 @pytest.fixture
 def walTheme():
     return {"colors": ["wal"]}
 
+
 @pytest.fixture
 def cycleValueTheme():
     return {"defaults": {"fg": ["red", "green", "blue"]}}
 
+
 @pytest.fixture
 def stateTheme():
     return {"warning": {"fg": "yellow"}, "critical": {"fg": "red"}}
 
+
 @pytest.fixture
 def overlayTheme():
     return {
@@ -53,20 +61,24 @@ def overlayTheme():
         "test": {"load": {"prefix": "b"}, "prefix": "x"},
     }
 
+
 def test_invalid_theme():
     with pytest.raises(RuntimeError):
         core.theme.Theme("this-theme-does-not-exist")
 
+
 def test_valid_theme():
     theme = core.theme.Theme("default")
     assert theme.name == "default"
 
+
 def test_defaults(defaultsTheme):
     theme = core.theme.Theme(raw_data=defaultsTheme)
 
     assert theme.get("fg") == defaultsTheme["defaults"]["fg"]
     assert theme.get("bg") == defaultsTheme["defaults"]["bg"]
 
+
 def test_cycle(mocker, cycleTheme):
     theme = core.theme.Theme(raw_data=cycleTheme)
 
@@ -90,6 +102,7 @@ def test_cycle(mocker, cycleTheme):
     assert theme.get("fg") == cycleTheme["cycle"][0]["fg"]
     assert theme.get("bg") == cycleTheme["cycle"][0]["bg"]
 
+
 def test_custom_iconset(defaultsTheme):
     theme = core.theme.Theme(raw_data=defaultsTheme)
 
@@ -101,7 +114,8 @@ def test_custom_iconset(defaultsTheme):
     )
 
     assert theme.get("padding") == "aaa"
-    assert theme.get("fg") == "blue" # test override
+    assert theme.get("fg") == "blue"  # test override
+
 
 def test_colors(defaultsTheme, colorTheme):
     theme = core.theme.Theme(raw_data=defaultsTheme)
@@ -110,6 +124,7 @@ def test_colors(defaultsTheme, colorTheme):
     theme = core.theme.Theme(raw_data=colorTheme)
     assert theme.keywords() == colorTheme["colors"][0]
 
+
 def test_wal_colors(mocker, walTheme):
     io = mocker.patch("core.theme.io")
     os = mocker.patch("core.theme.os")
@@ -124,6 +139,7 @@ def test_wal_colors(mocker, walTheme):
 
     assert theme.keywords() == {"red": "#ff0000"}
 
+
 def test_wal_special(mocker, walTheme):
     io = mocker.patch("core.theme.io")
     os = mocker.patch("core.theme.os")
@@ -137,17 +153,19 @@ def test_wal_special(mocker, walTheme):
 
     assert theme.keywords() == {"background": "#ff0000"}
 
+
 def test_cycle_value(cycleValueTheme):
     widget = core.widget.Widget()
     expected = cycleValueTheme["defaults"]["fg"]
     theme = core.theme.Theme(raw_data=cycleValueTheme)
 
     for i in range(0, len(expected) * 3):
-        assert theme.get("fg", widget) == expected[i%len(expected)]
+        assert theme.get("fg", widget) == expected[i % len(expected)]
         # ensure multiple invocations are OK
-        assert theme.get("fg", widget) == expected[i%len(expected)]
+        assert theme.get("fg", widget) == expected[i % len(expected)]
         core.event.trigger("draw")
 
+
 def test_state(stateTheme):
     widget = core.widget.Widget()
     theme = core.theme.Theme(raw_data=stateTheme)
@@ -160,6 +178,7 @@ def test_state(stateTheme):
     widget.state = types.MethodType(lambda self: ["critical"], widget)
     assert theme.get("fg", widget) == stateTheme["critical"]["fg"]
 
+
 def test_overlay(overlayTheme):
     widget = core.widget.Widget()
     module = SampleModule(widget)
diff --git a/tests/core/test_widget.py b/tests/core/test_widget.py
index 9a51021..ecaeee7 100644
--- a/tests/core/test_widget.py
+++ b/tests/core/test_widget.py
@@ -18,11 +18,13 @@ class SampleModule(core.module.Module):
     def state(self, widget):
         return self.states
 
+
 @pytest.fixture
 def widget_a():
     return core.widget.Widget("some random value")
 
-#class widget(unittest.TestCase):
+
+# class widget(unittest.TestCase):
 #    def setUp(self):
 #        self.someValue = "some random value"
 #        self.someOtherValue = "some different value"
@@ -34,38 +36,46 @@ def widget_a():
 #
 #        self.assertNotEqual(self.someValue, self.someOtherValue)
 
+
 def test_text_fulltext():
     widget = core.widget.Widget(full_text="this is some value")
     assert widget.full_text() == "this is some value"
 
+
 def test_set_fulltext(widget_a):
     assert widget_a.full_text() != "new value"
     widget_a.full_text("new value")
     assert widget_a.full_text() == "new value"
 
+
 def test_callable_fulltext(mocker):
     callback = mocker.MagicMock(return_value="callback returns")
     widget = core.widget.Widget(full_text=callback)
     assert widget.full_text() == "callback returns"
     callback.assert_called_once_with(widget)
 
+
 def test_set_callable_fulltext(mocker, widget_a):
     callback = mocker.MagicMock(return_value="this is a test")
     widget_a.full_text(callback)
     assert widget_a.full_text() == "this is a test"
     callback.assert_called_once_with(widget_a)
 
+
 def test_state_defaults_to_empty(widget_a):
     assert widget_a.state() == []
 
+
 def test_single_widget_state(widget_a):
     widget_a.set("state", "state1")
     assert widget_a.state() == ["state1"]
 
+
 def test_multiple_widget_states(widget_a):
     widget_a.set("state", ["state1", "state2"])
     assert widget_a.state() == ["state1", "state2"]
 
+
 def test_widget_module_state(widget_a):
     module = SampleModule(widgets=widget_a)
     widget_a.set("state", ["state1", "state2"])
@@ -76,6 +86,7 @@ def test_widget_module_state(widget_a):
     module.states = ["a", "b"]
     assert widget_a.state() == ["state1", "state2", "a", "b"]
 
+
 def test_multiple_widget_themes():
     widget1 = core.widget.Widget(full_text="a")
     widget2 = core.widget.Widget(full_text="b")
diff --git a/tests/modules/contrib/test_mpd.py b/tests/modules/contrib/test_mpd.py
index 26722e3..1fb48da 100644
--- a/tests/modules/contrib/test_mpd.py
+++ b/tests/modules/contrib/test_mpd.py
@@ -3,46 +3,65 @@ import pytest
 import core.config
 import modules.contrib.mpd
 
+
 @pytest.fixture
 def mpd_module():
     return modules.contrib.mpd.Module(config=core.config.Config([]), theme=None)
 
+
 def _test_state(mocker, mpd_module, widget_name, expected_output):
     widget = mocker.Mock()
     widget.name = widget_name
     return mpd_module.state(widget) == expected_output
 
+
 def test_states(mocker, mpd_module):
-    assert _test_state(mocker, mpd_module, 'mpd.repeat', 'repeat-off')
-    assert _test_state(mocker, mpd_module, 'mpd.shuffle', 'shuffle-off')
-    assert _test_state(mocker, mpd_module, 'mpd.prev', 'prev')
-    assert _test_state(mocker, mpd_module, 'mpd.next', 'next')
+    assert _test_state(mocker, mpd_module, "mpd.repeat", "repeat-off")
+    assert _test_state(mocker, mpd_module, "mpd.shuffle", "shuffle-off")
+    assert _test_state(mocker, mpd_module, "mpd.prev", "prev")
+    assert _test_state(mocker, mpd_module, "mpd.next", "next")
+
 
 def test_no_host(mpd_module):
-    assert mpd_module._hostcmd == ''
+    assert mpd_module._hostcmd == ""
+
 
 def test_host():
-    module_with_host = modules.contrib.mpd.Module(config=core.config.Config(['-p', 'mpd.host=sample-host']), theme=None)
-    assert module_with_host._hostcmd == ' -h sample-host'
+    module_with_host = modules.contrib.mpd.Module(
+        config=core.config.Config(["-p", "mpd.host=sample-host"]), theme=None
+    )
+    assert module_with_host._hostcmd == " -h sample-host"
+
 
 def test_host2(mocker):
     cli = mocker.patch("modules.contrib.mpd.util.cli")
-    module_with_host = modules.contrib.mpd.Module(config=core.config.Config(['-p', 'mpd.host=sample-host']), theme=None)
+    module_with_host = modules.contrib.mpd.Module(
+        config=core.config.Config(["-p", "mpd.host=sample-host"]), theme=None
+    )
     module_with_host.update()
     args, kwargs = cli.execute.call_args
 
     assert " -h sample-host" in args[0] and "mpc" in args[0]
 
+
 def test_bad_layout():
-    pytest.raises(KeyError, modules.contrib.mpd.Module, config=core.config.Config(['-p', 'mpd.layout="mpd.inexistent"']), theme=None)
+    pytest.raises(
+        KeyError,
+        modules.contrib.mpd.Module,
+        config=core.config.Config(["-p", 'mpd.layout="mpd.inexistent"']),
+        theme=None,
+    )
+
 
 def test_hidden_on_creation(mpd_module):
     assert mpd_module.hidden()
 
+
 def test_update_calls_load_song(mocker, mpd_module):
-    mocker.patch.object(mpd_module, '_load_song')
+    mocker.patch.object(mpd_module, "_load_song")
     mpd_module.update()
     mpd_module._load_song.assert_called_with()
 
+
 def test_default_layout(mpd_module):
     assert mpd_module._layout == "mpd.prev mpd.main mpd.next mpd.shuffle mpd.repeat"
diff --git a/tests/util/test_algorithm.py b/tests/util/test_algorithm.py
index 617187c..18d7a04 100644
--- a/tests/util/test_algorithm.py
+++ b/tests/util/test_algorithm.py
@@ -2,22 +2,27 @@ import pytest
 
 from util.algorithm import *
 
+
 @pytest.fixture
 def someData():
     return {"a": 100, "b": 200, "c": [1, 2, 3]}
 
+
 @pytest.fixture
 def differentData():
     return {"x": 20, "y": "bla", "z": ["a", "b"]}
 
+
 @pytest.fixture
 def moreData():
     return {"n": 100}
 
+
 @pytest.fixture
 def overlapData():
     return {"a": 200, "c": [1, 2, 4]}
 
+
 def test_merge_with_empty(someData):
     assert merge(someData, {}) == someData
     assert merge(someData, None) == None
diff --git a/tests/util/test_cli.py b/tests/util/test_cli.py
index b2d8f81..ee25d71 100644
--- a/tests/util/test_cli.py
+++ b/tests/util/test_cli.py
@@ -2,24 +2,30 @@ import pytest
 
 import util.cli
 
+
 def test_valid_command():
     assert util.cli.execute("echo test") == "test\n"
 
+
 def test_utf_command():
     rv = util.cli.execute("echo ÖPmŧß")
     assert util.cli.execute("echo ÖPmŧß") == "ÖPmŧß\n"
 
+
 def test_invalid_command():
     with pytest.raises(RuntimeError):
         util.cli.execute("i-do-not-exist")
 
+
 def test_command_exit_code():
     with pytest.raises(RuntimeError):
         util.cli.execute("cat i-do-not-exist")
 
+
 def test_command_exit_code_no_error():
     util.cli.execute("cat i-do-not-exist", ignore_errors=True)
 
+
 def test_async():
     assert util.cli.execute("echo test", wait=False) == ""