Patch abspath for linux testing ensure consistent paths on Windows

Author: bridadan

test/os_linux_generic.py

@@ -18,10 +18,10 @@
 
 import unittest
 import sys
+import os
 from mock import patch
 from mbed_lstools.linux import MbedLsToolsLinuxGeneric
 
-
 class LinuxPortTestCase(unittest.TestCase):
     ''' Basic test cases checking trivial asserts
     '''
@@ -86,6 +86,7 @@ def find_candidates_with_patch(self, mount_list, link_dict, listdir_dict):
         with patch('mbed_lstools.linux.MbedLsToolsLinuxGeneric._run_cli_process') as _cliproc,\
              patch('os.readlink') as _readlink,\
              patch('os.listdir') as _listdir,\
+             patch('mbed_lstools.linux.abspath') as _abspath,\
              patch('mbed_lstools.linux.isdir') as _isdir:
             _isdir.return_value = True
             _cliproc.return_value = (b'\n'.join(mount_list), None, 0)
@@ -99,6 +100,12 @@ def do_listdir(dir):
                 dir = dir.replace('\\', '/')
                 return listdir_dict[dir]
             _listdir.side_effect = do_listdir
+            def do_abspath(dir):
+                _, path = os.path.splitdrive(
+                    os.path.normpath(os.path.join(os.getcwd(), dir)))
+                path = path.replace('\\', '/')
+                return path
+            _abspath.side_effect = do_abspath
             ret_val = self.linux_generic.find_candidates()
             _cliproc.assert_called_once_with('mount')
             return ret_val