[tests] Purge tests and start with a clean implementation of subprocess

Seems like subprocess and friends (Popen, communicate) are not so easy
to mock cleanly. Therefore, start from scratch and carefully write test
by test, until (at least) the old test coverage has been restored.

tests/modules/test_brightness.py

@@ -1,56 +0,0 @@
-# pylint: disable=C0103,C0111
-
-import json
-import unittest
-import mock
-
-import bumblebee.input
-from bumblebee.input import I3BarInput
-from bumblebee.modules.brightness import Module
-from tests.util import MockEngine, MockConfig, assertPopen, assertMouseEvent
-
-class TestBrightnessModule(unittest.TestCase):
-    def setUp(self):
-        self.engine = MockEngine()
-        self.engine.input = I3BarInput()
-        self.engine.input.need_event = True
-        self.config = MockConfig()
-        self.module = Module(engine=self.engine, config={ "config": self.config })
-        for widget in self.module.widgets():
-            widget.link_module(self.module)
-
-    @mock.patch("sys.stdout")
-    def test_format(self, mock_output):
-        for widget in self.module.widgets():
-            self.assertEquals(len(widget.full_text()), len("100%"))
-
-    @mock.patch("select.epoll")
-    @mock.patch("subprocess.Popen")
-    @mock.patch("sys.stdin")
-    def test_wheel_up(self, mock_input, mock_output, mock_select):
-        assertMouseEvent(mock_input, mock_output, mock_select, self.engine,
-            self.module, bumblebee.input.WHEEL_UP,
-            "xbacklight +2%"
-        )
-
-    @mock.patch("select.epoll")
-    @mock.patch("subprocess.Popen")
-    @mock.patch("sys.stdin")
-    def test_wheel_down(self, mock_input, mock_output, mock_select):
-        assertMouseEvent(mock_input, mock_output, mock_select, self.engine,
-            self.module, bumblebee.input.WHEEL_DOWN,
-            "xbacklight -2%"
-        )
-
-    @mock.patch("select.epoll")
-    @mock.patch("subprocess.Popen")
-    @mock.patch("sys.stdin")
-    def test_custom_step(self, mock_input, mock_output, mock_select):
-        self.config.set("brightness.step", "10")
-        module = Module(engine=self.engine, config={ "config": self.config })
-        assertMouseEvent(mock_input, mock_output, mock_select, self.engine,
-            module, bumblebee.input.WHEEL_DOWN,
-            "xbacklight -10%"
-        )
-
-# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4