Remove more test requirements (#7574)

* No longer require pyunify during tests

* No longer require cast during tests

* No longer required dependency for tests

* No longer require pymochad for tests

* Astral is a core dependency

* Avoid having to install datadog dependency during tests

* CMUS test doesn't test anything

* Frontier Silicon doesn't test anything

* No longer require mutagen

* Update requirements_test_all.txt

* Remove stale comment

tests/components/switch/test_mochad.py

@@ -2,6 +2,8 @@
 import unittest
 import unittest.mock as mock
 
+import pytest
+
 from homeassistant.setup import setup_component
 from homeassistant.components import switch
 from homeassistant.components.switch import mochad
@@ -9,6 +11,15 @@ from homeassistant.components.switch import mochad
 from tests.common import get_test_home_assistant
 
 
+@pytest.fixture(autouse=True)
+def pymochad_mock():
+    """Mock pymochad."""
+    with mock.patch.dict('sys.modules', {
+        'pymochad': mock.MagicMock(),
+    }):
+        yield
+
+
 class TestMochadSwitchSetup(unittest.TestCase):
     """Test the mochad switch."""
 
@@ -18,17 +29,14 @@ class TestMochadSwitchSetup(unittest.TestCase):
 
     def setUp(self):
         """Setup things to be run when tests are started."""
-        super(TestMochadSwitchSetup, self).setUp()
         self.hass = get_test_home_assistant()
 
     def tearDown(self):
         """Stop everyhing that was started."""
         self.hass.stop()
-        super(TestMochadSwitchSetup, self).tearDown()
 
-    @mock.patch('pymochad.controller.PyMochad')
     @mock.patch('homeassistant.components.switch.mochad.MochadSwitch')
-    def test_setup_adds_proper_devices(self, mock_switch, mock_client):
+    def test_setup_adds_proper_devices(self, mock_switch):
         """Test if setup adds devices."""
         good_config = {
             'mochad': {},
@@ -50,12 +58,8 @@ class TestMochadSwitch(unittest.TestCase):
 
     def setUp(self):
         """Setup things to be run when tests are started."""
-        super(TestMochadSwitch, self).setUp()
         self.hass = get_test_home_assistant()
         controller_mock = mock.MagicMock()
-        device_patch = mock.patch('pymochad.device.Device')
-        device_patch.start()
-        self.addCleanup(device_patch.stop)
         dev_dict = {'address': 'a1', 'name': 'fake_switch'}
         self.switch = mochad.MochadSwitch(self.hass, controller_mock,
                                           dev_dict)