diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index f8053fb6..19b9bb04 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -19,9 +19,16 @@ class TestConfig(TestCase):
 	def test_vim(self):
 		from powerline.vim import VimPowerline
 		cfg_path = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'powerline', 'config_files')
-		buffers = ((('bufoptions',), {'buftype': 'help'}), (('bufname', '[Command Line]'), {}), (('bufoptions',), {'buftype': 'quickfix'}))
+		buffers = (
+			(('bufoptions',), {'buftype': 'help'}),
+			(('bufname', '[Command Line]'), {}),
+			(('bufoptions',), {'buftype': 'quickfix'}),
+		)
 		with open(os.path.join(cfg_path, 'config.json'), 'r') as f:
-			self.assertEqual(len(buffers), len(json.load(f)['ext']['vim']['local_themes']))
+			local_themes_raw = json.load(f)['ext']['vim']['local_themes']
+			# Don't run tests on external/plugin segments
+			local_themes = dict((k, v) for (k, v) in local_themes_raw.items() if not '.' in k)
+			self.assertEqual(len(buffers), len(local_themes))
 		outputs = {}
 		i = 0
 
diff --git a/tests/vim.py b/tests/vim.py
index beec40de..91a94886 100644
--- a/tests/vim.py
+++ b/tests/vim.py
@@ -156,6 +156,9 @@ def command(cmd):
 	elif cmd.startswith('hi '):
 		sp = cmd.split()
 		_highlights[sp[1]] = sp[2:]
+	elif cmd.startswith('function! Powerline_plugin_ctrlp'):
+		# Ignore CtrlP updating functions
+		pass
 	else:
 		raise NotImplementedError
 
@@ -169,6 +172,8 @@ def eval(expr):
 	elif expr.startswith('PowerlineRegisterCachePurgerEvent'):
 		_buf_purge_events.add(expr[expr.find('"') + 1:expr.rfind('"') - 1])
 		return "0"
+	elif expr.startswith('exists('):
+		return '0'
 	raise NotImplementedError