Added test for Introduction component

This test may seem useless, but it is good to ensure that default
components don’t ever crash HASS.

tests/components/test_introduction.py

@@ -0,0 +1,28 @@
+"""
+tests.components.introduction
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Test introduction.
+
+This test is primarily to ensure that default components don't crash HASS.
+"""
+
+import unittest
+
+import homeassistant.core as ha
+from homeassistant.components import introduction
+
+
+class TestIntroduction(unittest.TestCase):
+    """ Test Introduction. """
+
+    def setUp(self):
+        self.hass = ha.HomeAssistant()
+
+    def tearDown(self):
+        """ Stop down stuff we started. """
+        self.hass.stop()
+
+    def test_setup(self):
+        """ Test Introduction setup """
+        self.assertTrue(introduction.setup(self.hass, {}))