detect Windows UNC prefix for remote network drives

tests/samples/netuse/v1

@@ -0,0 +1,7 @@
+New connections will be remembered.
+
+Status       Local     Remote                    Network
+
+-------------------------------------------------------------------------------
+             C:        \\vboxsrv\Projects         VirtualBox Shared Folders
+The command completed successfully.

tests/samples/netuse/v2

@@ -0,0 +1,8 @@
+New connections will be remembered.
+
+Status       Local     Remote                    Network
+
+-------------------------------------------------------------------------------
+             C:        \\vboxsrv\Projects         VirtualBox Shared Folders
+OK           D:        \\192.0.0.1\work           VirtualBox Shared Folders
+The command completed successfully.

tests/test_heartbeat.py

@@ -6,7 +6,7 @@ from wakatime.heartbeat import Heartbeat
 import os
 import logging
 from testfixtures import log_capture
-from .utils import TestCase
+from .utils import DynamicIterable, TestCase, mock
 
 
 class HeartbeatTestCase(TestCase):
@@ -116,3 +116,31 @@ class HeartbeatTestCase(TestCase):
 
         self.assertNothingPrinted()
         self.assertNothingLogged(logs)
+
+    def test_parsing(self):
+
+        class Args(object):
+            hide_file_names = ['.*']
+            hide_project_names = []
+            plugin = None
+
+        samples = [
+            ('v1', 'C:\\v1\\file.txt', '\\\\vboxsrv\\Projects\\v1\\file.txt'),
+            ('v2', 'D:\\stuff\\v2\\file.py', '\\\\192.0.0.1\\work\\stuff\\v2\\file.py'),
+        ]
+        for sample, filepath, expected in samples:
+            with mock.patch('wakatime.heartbeat.Popen') as mock_popen:
+
+                class MockCommunicate(object):
+                    pass
+
+                stdout = open('tests/samples/netuse/' + sample).read()
+                mock_communicate = MockCommunicate()
+                mock_communicate.communicate = mock.MagicMock(return_value=DynamicIterable((stdout, ''), max_calls=1))
+                mock_popen.return_value = mock_communicate
+
+                heartbeat = Heartbeat({'user_agent': 'test'}, Args(), None, _clone=True)
+                result = heartbeat._to_unc_path(filepath)
+                self.assertEquals(expected, result)
+
+        self.assertNothingPrinted()