Do not check if .git folder exists

git commands will fail anyway if not present

tests/unit/test_utils.py

@@ -16,25 +16,11 @@ import os
 import unittest
 
 from tests import fixtures
-from django_migration_linter.utils import is_django_project, is_git_project, is_directory, find_project_settings_module, \
+from django_migration_linter.utils import is_django_project, is_directory, find_project_settings_module, \
     split_path, split_migration_path
 
 
 class UtilityFunctionTest(unittest.TestCase):
-    def tearDown(self, *args, **kwargs):
-        fixtures.clear_all_git_projects()
-        super(
-            UtilityFunctionTest,
-            self).tearDown(*args, **kwargs)
-
-    def test_detect_not_git_project(self):
-        self.assertFalse(is_git_project(fixtures.NOT_GIT_DJANGO_PROJECT))
-
-    def test_detect_git_project(self):
-        project_path = fixtures.MULTI_COMMIT_PROJECT
-        fixtures.prepare_git_project(project_path)
-        self.assertTrue(is_git_project(project_path))
-
     def test_detect_django_project(self):
         self.assertTrue(is_django_project(fixtures.ADD_NOT_NULL_COLUMN_PROJECT))