unittest: Fix clang-tidy-fix

The unittest case for `clang-tidy-fix` checks if the whole project is in
git or not, and skips if not.

Fix this by creating a temporary git repo, copy the test files and run
the tests, following how `clang-format` does.

It also reverts some help code introduced in the previous test.

Tested: Verify the test case passes.

Signed-off-by: Lei YU <yulei.sh@bytedance.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/unittests/helpers.py b/unittests/helpers.py
index 83327cbad..7483f51b7 100644
--- a/unittests/helpers.py
+++ b/unittests/helpers.py
@@ -12,7 +12,7 @@ from contextlib import contextmanager
 from mesonbuild.compilers import detect_c_compiler, compiler_from_language
 from mesonbuild.mesonlib import (
     MachineChoice, is_osx, is_cygwin, EnvironmentException, OptionKey, MachineChoice,
-    OrderedSet, quiet_git
+    OrderedSet
 )
 from run_tests import get_fake_env
 
@@ -135,9 +135,6 @@ def is_tarball():
         return True
     return False
 
-def is_git_repo():
-    return quiet_git(['branch'], '.')[0]
-
 @contextmanager
 def chdir(path: str):
     curdir = os.getcwd()