Refactor test_cli_prompt.py and add conftest.py

- Remove unnecessary imports and comments in test_cli_prompt.py
- Move git_repo fixture to conftest.py
- Update '--topic' option formatting in _cli.py

devchat/_cli.py

@@ -174,7 +174,8 @@ def prompt(content: Optional[str], parent: Optional[str], reference: Optional[Li
 
 @click.option('--skip', default=0, help='Skip number prompts before showing the prompt history.')
 @click.option('-n', '--max-count', default=100, help='Limit the number of commits to output.')
-@click.option('-t', '--topic', default=None, help='Hash of the root prompt of the topic to select prompts from.')
+@click.option('-t', '--topic', default=None,
+              help='Hash of the root prompt of the topic to select prompts from.')
 def log(skip, max_count, topic):
     """
     Show the prompt history.

tests/conftest.py

@@ -0,0 +1,27 @@
+import os
+import shutil
+import tempfile
+import pytest
+from git import Repo
+
+
+@pytest.fixture(name='git_repo', scope='module')
+def fixture_git_repo(request):
+    # Create a temporary directory
+    repo_dir = tempfile.mkdtemp()
+
+    # Initialize a new Git repository in the temporary directory
+    Repo.init(repo_dir)
+
+    # Change the current working directory to the temporary directory
+    prev_cwd = os.getcwd()
+    os.chdir(repo_dir)
+
+    # Add a cleanup function to remove the temporary directory after the test
+    def cleanup():
+        os.chdir(prev_cwd)
+        shutil.rmtree(repo_dir)
+
+    request.addfinalizer(cleanup)
+
+    return repo_dir

tests/test_cli_prompt.py

@@ -1,42 +1,14 @@
-"""
-test_cli.py - Tests for the command line interface.
-"""
 import os
 import re
 import json
-import shutil
-import tempfile
 import pytest
-from git import Repo
 from click.testing import CliRunner
 from devchat._cli import main
 from devchat.utils import response_tokens
 
 runner = CliRunner()
 
 
-@pytest.fixture(name="git_repo")
-def fixture_git_repo(request):
-    # Create a temporary directory
-    repo_dir = tempfile.mkdtemp()
-
-    # Initialize a new Git repository in the temporary directory
-    Repo.init(repo_dir)
-
-    # Change the current working directory to the temporary directory
-    prev_cwd = os.getcwd()
-    os.chdir(repo_dir)
-
-    # Add a cleanup function to remove the temporary directory after the test
-    def cleanup():
-        os.chdir(prev_cwd)
-        shutil.rmtree(repo_dir)
-
-    request.addfinalizer(cleanup)
-
-    return repo_dir
-
-
 def test_prompt_no_args(git_repo):  # pylint: disable=W0613
     result = runner.invoke(main, ['prompt'])
     assert result.exit_code == 0