fix: use GitPython in _make_test_repo and run CI pytest once with coverage

- Convert _make_test_repo from subprocess.run to GitPython to prevent
  git failures on Linux CI (matching test_git_reader.py pattern)
- Merge two CI pytest steps into one to avoid redundant runs and
  eliminate potential state pollution between runs

Author: SemTiOne

.github/workflows/tests.yml

@@ -93,10 +93,8 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -e ".[dev]"
-      - name: Run tests (no coverage)
-        run: pytest tests/ -v --tb=long --junitxml=junit.xml -o junit_family=legacy
-      - name: Coverage check
-        run: pytest tests/ -q --tb=short --cov=standup --cov-report=xml --cov-report=term-missing --cov-fail-under=85
+      - name: Run tests with coverage
+        run: pytest tests/ -v --tb=short --cov=standup --cov-report=xml --cov-report=term-missing --cov-fail-under=85 --junitxml=junit.xml -o junit_family=legacy
       - name: Upload coverage
         if: matrix.python-version == '3.12'
         uses: codecov/codecov-action@v5

tests/test_main_startup.py

@@ -67,17 +67,18 @@ def generate_standup(self, prompt: str, tone: str) -> str:
 
 
 def _make_test_repo(tmp_path):
-    import subprocess
-
-    repo = tmp_path / "repo"
-    repo.mkdir()
-    subprocess.run(["git", "init", "-q"], cwd=repo, check=True)
-    subprocess.run(["git", "config", "user.email", "a@b.com"], cwd=repo, check=True)
-    subprocess.run(["git", "config", "user.name", "Test"], cwd=repo, check=True)
-    (repo / "f.txt").write_text("hi")
-    subprocess.run(["git", "add", "."], cwd=repo, check=True)
-    subprocess.run(["git", "commit", "-q", "-m", "feat: add file"], cwd=repo, check=True)
-    return str(repo)
+    import git as git_module
+
+    repo_dir = tmp_path / "repo"
+    repo_dir.mkdir()
+    repo = git_module.Repo.init(str(repo_dir))
+    with repo.config_writer() as cw:
+        cw.set_value("user", "email", "a@b.com")
+        cw.set_value("user", "name", "Test")
+    (repo_dir / "f.txt").write_text("hi")
+    repo.index.add(["f.txt"])
+    repo.index.commit("feat: add file")
+    return str(repo_dir)
 
 
 def _base_config(repo_path: str) -> dict: