store sample git repo as dot_git, then copy when testing

tests/samples/projects/git/dot_git/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

tests/samples/projects/git/dot_git/config

@@ -0,0 +1,7 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true
+	precomposeunicode = true

tests/test_wakatime_project.py

@@ -5,6 +5,9 @@ from wakatime.main import execute
 from wakatime.packages import requests
 from wakatime.packages.requests.models import Response
 
+import os
+import shutil
+import tempfile
 import time
 from wakatime.compat import u
 from . import utils
@@ -55,8 +58,12 @@ class LanguagesTestCase(utils.TestCase):
         response.status_code = 0
         self.patched['wakatime.packages.requests.adapters.HTTPAdapter.send'].return_value = response
 
+        tempdir = tempfile.mkdtemp()
+        shutil.copytree('tests/samples/projects/git', os.path.join(tempdir, 'git'))
+        shutil.move(os.path.join(tempdir, 'git', 'dot_git'), os.path.join(tempdir, 'git', '.git'))
+
         now = u(int(time.time()))
-        entity = 'tests/samples/projects/git/emptyfile.txt'
+        entity = os.path.join(tempdir, 'git', 'emptyfile.txt')
         config = 'tests/samples/sample.cfg'
 
         args = ['--file', entity, '--config', config, '--time', now]