cygwin, #533: polish abs-paths in git add commands

+ Modify TCs - no main-code changes. + FIXed: + `TestSubmodule.test_git_submodules_and_add_sm_with_new_commit()` + TestDiff.test_diff_with_staged_file() - Cygwin TCs failing: - PY2: err: 12, fail: 2 - PY3: err: 11, fail: 2

git/test/test_diff.py

@@ -25,6 +25,7 @@
 NULL_TREE,
 )
 importddt
+fromgit.cmdimportGit
 
 
 @ddt.ddt
@@ -56,7 +57,7 @@ def test_diff_with_staged_file(self, rw_dir):
 fp=os.path.join(rw_dir, 'hello.txt')
 withopen(fp, 'w') asfs:
 fs.write("hello world")
-r.git.add(fp)
+r.git.add(Git.polish_url(fp))
 r.git.commit(message="init")
 
 withopen(fp, 'w') asfs:

git/test/test_submodule.py

@@ -705,7 +705,7 @@ def test_git_submodules_and_add_sm_with_new_commit(self, rwdir):
 fp=osp.join(smm.working_tree_dir, 'empty-file')
 withopen(fp, 'w'):
 pass
-smm.git.add(fp)
+smm.git.add(Git.polish_url(fp))
 smm.git.commit(m="new file added")
 
 # submodules are retrieved from the current commit's tree, therefore we can't really get a new submodule

git/util.py

@@ -264,6 +264,7 @@ def _cygexpath(drive, path):
 
 
 defcygpath(path):
+"""Use :meth:`git.cmd.Git.polish_url()` instead, that works on any environment."""
 ifnotpath.startswith(('/cygdrive', '//')):
 forregex, parser, recursein_cygpath_parsers:
 match=regex.match(path)