diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index b2c1d256c4a42abe2886d9e4d76af76f21b02d17..21c56f55badfb404c20fa0365db4d339e7d057a4 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -118,7 +118,8 @@ def _setup_component(hass: core.HomeAssistant, domain: str, config) -> bool:
 
         # Assumption: if a component does not depend on groups
         # it communicates with devices
-        if 'group' not in getattr(component, 'DEPENDENCIES', []):
+        if 'group' not in getattr(component, 'DEPENDENCIES', []) and \
+           hass.pool.worker_count <= 10:
             hass.pool.add_worker()
 
         hass.bus.fire(
diff --git a/homeassistant/components/switch/rfxtrx.py b/homeassistant/components/switch/rfxtrx.py
index 43f2fe6a86f1305a67d56883d3f923286b926f38..959bab5fe40120fb4727292fa8ee74b2e75fcb11 100644
--- a/homeassistant/components/switch/rfxtrx.py
+++ b/homeassistant/components/switch/rfxtrx.py
@@ -6,7 +6,6 @@ https://home-assistant.io/components/switch.rfxtrx/
 """
 import logging
 
-
 import homeassistant.components.rfxtrx as rfxtrx
 from homeassistant.components.switch import SwitchDevice
 
diff --git a/requirements_all.txt b/requirements_all.txt
index ba021d93cb089c47f358d3feab3c030c31510eca..083865f8db20a3cadf10d6b0216957961193b1f0 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -81,7 +81,7 @@ eliqonline==1.0.12
 enocean==0.31
 
 # homeassistant.components.keyboard_remote
-evdev==0.6.1
+# evdev==0.6.1
 
 # homeassistant.components.climate.honeywell
 # homeassistant.components.thermostat.honeywell
diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index 65ffa26116aa16861afa6b356595e961821f33ff..a5a25e7bab435ba3982abeead277497021f1ca10 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -16,6 +16,7 @@ COMMENT_REQUIREMENTS = (
     'python-lirc',
     'gattlib',
     'pyuserinput',
+    'evdev',
 )
 
 IGNORE_PACKAGES = (
diff --git a/tests/components/camera/test_uvc.py b/tests/components/camera/test_uvc.py
index 10b5cf832f39cb3d4b8292e8e2840ee8b7d1cf40..01ce1cec518c69f4dcf3aa1a5edec6313e4a235a 100644
--- a/tests/components/camera/test_uvc.py
+++ b/tests/components/camera/test_uvc.py
@@ -38,6 +38,7 @@ class TestUVCSetup(unittest.TestCase):
                 return {'model': 'UVC'}
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         hass.config.components = ['http']
         mock_remote.return_value.index.return_value = fake_cameras
         mock_remote.return_value.get_camera.side_effect = fake_get_camera
@@ -65,6 +66,7 @@ class TestUVCSetup(unittest.TestCase):
             {'uuid': 'two', 'name': 'Back', 'id': 'id2'},
         ]
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         hass.config.components = ['http']
         mock_remote.return_value.index.return_value = fake_cameras
         mock_remote.return_value.get_camera.return_value = {'model': 'UVC'}
@@ -92,6 +94,7 @@ class TestUVCSetup(unittest.TestCase):
             {'uuid': 'two', 'name': 'Back', 'id': 'id2'},
         ]
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         hass.config.components = ['http']
         mock_remote.return_value.index.return_value = fake_cameras
         mock_remote.return_value.get_camera.return_value = {'model': 'UVC'}
@@ -109,6 +112,7 @@ class TestUVCSetup(unittest.TestCase):
     def test_setup_incomplete_config(self, mock_uvc):
         """"Test the setup with incomplete configuration."""
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         hass.config.components = ['http']
 
         assert setup_component(
@@ -133,6 +137,7 @@ class TestUVCSetup(unittest.TestCase):
             'key': 'secret',
         }
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         hass.config.components = ['http']
 
         for error in errors:
diff --git a/tests/components/cover/test_rfxtrx.py b/tests/components/cover/test_rfxtrx.py
index 96fecff2ee2d78a859580c188a46fbaea4dab040..a73a2b978dc54f7219ac745f1e0f53d2996f0300 100644
--- a/tests/components/cover/test_rfxtrx.py
+++ b/tests/components/cover/test_rfxtrx.py
@@ -1,12 +1,15 @@
 """The tests for the Rfxtrx cover platform."""
 import unittest
 
+import pytest
+
 from homeassistant.bootstrap import _setup_component
 from homeassistant.components import rfxtrx as rfxtrx_core
 
 from tests.common import get_test_home_assistant
 
 
+@pytest.mark.skipif("os.environ.get('RFXTRX') == 'SKIP'")
 class TestCoverRfxtrx(unittest.TestCase):
     """Test the Rfxtrx cover platform."""
 
diff --git a/tests/components/light/test_rfxtrx.py b/tests/components/light/test_rfxtrx.py
index cd4cecd8505ac506f45786308e59c96975307e6d..80014dfd1c16fbbe3f9658e5303c992916dfbec4 100644
--- a/tests/components/light/test_rfxtrx.py
+++ b/tests/components/light/test_rfxtrx.py
@@ -1,12 +1,15 @@
 """The tests for the Rfxtrx light platform."""
 import unittest
 
+import pytest
+
 from homeassistant.bootstrap import _setup_component
 from homeassistant.components import rfxtrx as rfxtrx_core
 
 from tests.common import get_test_home_assistant
 
 
+@pytest.mark.skipif("os.environ.get('RFXTRX') == 'SKIP'")
 class TestLightRfxtrx(unittest.TestCase):
     """Test the Rfxtrx light platform."""
 
diff --git a/tests/components/rollershutter/test_rfxtrx.py b/tests/components/rollershutter/test_rfxtrx.py
index 704fa9310e6cb3d8c31ad1ad8f723bf45d207fd3..1218ab37a59811cc4a6b22e2937f1b22e993c7b4 100644
--- a/tests/components/rollershutter/test_rfxtrx.py
+++ b/tests/components/rollershutter/test_rfxtrx.py
@@ -1,12 +1,15 @@
 """The tests for the Rfxtrx roller shutter platform."""
 import unittest
 
+import pytest
+
 from homeassistant.bootstrap import _setup_component
 from homeassistant.components import rfxtrx as rfxtrx_core
 
 from tests.common import get_test_home_assistant
 
 
+@pytest.mark.skipif("os.environ.get('RFXTRX') == 'SKIP'")
 class TestRollershutterRfxtrx(unittest.TestCase):
     """Test the Rfxtrx roller shutter platform."""
 
diff --git a/tests/components/sensor/test_rfxtrx.py b/tests/components/sensor/test_rfxtrx.py
index 2d38de5eab5096a7550a693b2f09ae261a0eeef7..e42aaea7e04d449a125089888496876590783303 100644
--- a/tests/components/sensor/test_rfxtrx.py
+++ b/tests/components/sensor/test_rfxtrx.py
@@ -1,6 +1,8 @@
 """The tests for the Rfxtrx sensor platform."""
 import unittest
 
+import pytest
+
 from homeassistant.bootstrap import _setup_component
 from homeassistant.components import rfxtrx as rfxtrx_core
 from homeassistant.const import TEMP_CELSIUS
@@ -8,6 +10,7 @@ from homeassistant.const import TEMP_CELSIUS
 from tests.common import get_test_home_assistant
 
 
+@pytest.mark.skipif("os.environ.get('RFXTRX') == 'SKIP'")
 class TestSensorRfxtrx(unittest.TestCase):
     """Test the Rfxtrx sensor platform."""
 
diff --git a/tests/components/switch/test_rfxtrx.py b/tests/components/switch/test_rfxtrx.py
index 72c13bd0ba4c421793bb5095635b95c2e759ff9e..729abf6db063eca65c5148815e2e04b5c29fd0ee 100644
--- a/tests/components/switch/test_rfxtrx.py
+++ b/tests/components/switch/test_rfxtrx.py
@@ -1,12 +1,15 @@
 """The tests for the Rfxtrx switch platform."""
 import unittest
 
+import pytest
+
 from homeassistant.bootstrap import _setup_component
 from homeassistant.components import rfxtrx as rfxtrx_core
 
 from tests.common import get_test_home_assistant
 
 
+@pytest.mark.skipif("os.environ.get('RFXTRX') == 'SKIP'")
 class TestSwitchRfxtrx(unittest.TestCase):
     """Test the Rfxtrx switch platform."""
 
diff --git a/tests/components/test_influxdb.py b/tests/components/test_influxdb.py
index 7aa4fd616a9964fe72db466a14a8eab556bd0bf4..3210bf0db9feba475ca4045f34d3a3c3490a9f8a 100644
--- a/tests/components/test_influxdb.py
+++ b/tests/components/test_influxdb.py
@@ -17,6 +17,7 @@ class TestInfluxDB(unittest.TestCase):
     def setUp(self):
         """Setup things to be run when tests are started."""
         self.hass = mock.MagicMock()
+        self.hass.pool.worker_count = 2
         self.handler_method = None
 
     def test_setup_config_full(self, mock_client):
diff --git a/tests/components/test_logentries.py b/tests/components/test_logentries.py
index 8642c4aa9a293548f22e3b689f3f452995810e2a..94097fba32c79793ea9b28b192f065423ae2c755 100644
--- a/tests/components/test_logentries.py
+++ b/tests/components/test_logentries.py
@@ -19,6 +19,7 @@ class TestLogentries(unittest.TestCase):
             }
         }
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, logentries.DOMAIN, config))
         self.assertTrue(hass.bus.listen.called)
         self.assertEqual(EVENT_STATE_CHANGED,
@@ -32,6 +33,7 @@ class TestLogentries(unittest.TestCase):
             }
         }
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, logentries.DOMAIN, config))
         self.assertTrue(hass.bus.listen.called)
         self.assertEqual(EVENT_STATE_CHANGED,
@@ -48,6 +50,7 @@ class TestLogentries(unittest.TestCase):
             }
         }
         self.hass = mock.MagicMock()
+        self.hass.pool.worker_count = 2
         setup_component(self.hass, logentries.DOMAIN, config)
         self.handler_method = self.hass.bus.listen.call_args_list[0][0][1]
 
diff --git a/tests/components/test_logger.py b/tests/components/test_logger.py
index 89577d8535db9e8ea555b65d2daeb2d928f31f97..e0243335dfa77a97c3fe5517d1c3e84dda8c5df3 100644
--- a/tests/components/test_logger.py
+++ b/tests/components/test_logger.py
@@ -24,7 +24,9 @@ class TestUpdater(unittest.TestCase):
 
     def test_logger_setup(self):
         """Use logger to create a logging filter."""
-        setup_component(MagicMock(), logger.DOMAIN, self.log_config)
+        hass = MagicMock()
+        hass.pool.worker_count = 2
+        setup_component(hass, logger.DOMAIN, self.log_config)
 
         self.assertTrue(len(logging.root.handlers) > 0)
         handler = logging.root.handlers[-1]
@@ -37,7 +39,9 @@ class TestUpdater(unittest.TestCase):
 
     def test_logger_test_filters(self):
         """Test resulting filter operation."""
-        setup_component(MagicMock(), logger.DOMAIN, self.log_config)
+        hass = MagicMock()
+        hass.pool.worker_count = 2
+        setup_component(hass, logger.DOMAIN, self.log_config)
 
         log_filter = logging.root.handlers[-1].filters[0]
 
diff --git a/tests/components/test_splunk.py b/tests/components/test_splunk.py
index 7dcc3ca5f5cba88cc775b81179fe7ba75fd780b6..84dc4dfaac5c7e8b3d89ba434b171cd752454c03 100644
--- a/tests/components/test_splunk.py
+++ b/tests/components/test_splunk.py
@@ -22,6 +22,7 @@ class TestSplunk(unittest.TestCase):
         }
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, splunk.DOMAIN, config))
         self.assertTrue(hass.bus.listen.called)
         self.assertEqual(EVENT_STATE_CHANGED,
@@ -37,6 +38,7 @@ class TestSplunk(unittest.TestCase):
         }
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, splunk.DOMAIN, config))
         self.assertTrue(hass.bus.listen.called)
         self.assertEqual(EVENT_STATE_CHANGED,
@@ -56,6 +58,7 @@ class TestSplunk(unittest.TestCase):
         }
 
         self.hass = mock.MagicMock()
+        self.hass.pool.worker_count = 2
         setup_component(self.hass, splunk.DOMAIN, config)
         self.handler_method = self.hass.bus.listen.call_args_list[0][0][1]
 
diff --git a/tests/components/test_statsd.py b/tests/components/test_statsd.py
index ff3647674fd81294e845ecdfc3c6a0b5c94f5d6c..6cbb26b7416e0313e5647021d2af43a0e9322c57 100644
--- a/tests/components/test_statsd.py
+++ b/tests/components/test_statsd.py
@@ -38,6 +38,7 @@ class TestStatsd(unittest.TestCase):
             }
         }
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, statsd.DOMAIN, config))
         mock_connection.assert_called_once_with(
             host='host',
@@ -61,6 +62,7 @@ class TestStatsd(unittest.TestCase):
         config['statsd'][statsd.CONF_PREFIX] = statsd.DEFAULT_PREFIX
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         self.assertTrue(setup_component(hass, statsd.DOMAIN, config))
         mock_connection.assert_called_once_with(
             host='host',
@@ -80,6 +82,7 @@ class TestStatsd(unittest.TestCase):
         config['statsd'][statsd.CONF_RATE] = statsd.DEFAULT_RATE
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         setup_component(hass, statsd.DOMAIN, config)
         self.assertTrue(hass.bus.listen.called)
         handler_method = hass.bus.listen.call_args_list[0][0][1]
@@ -121,6 +124,7 @@ class TestStatsd(unittest.TestCase):
         config['statsd'][statsd.CONF_RATE] = statsd.DEFAULT_RATE
 
         hass = mock.MagicMock()
+        hass.pool.worker_count = 2
         setup_component(hass, statsd.DOMAIN, config)
         self.assertTrue(hass.bus.listen.called)
         handler_method = hass.bus.listen.call_args_list[0][0][1]