Refactor code structure for improved readability and maintainability

tests/test_git_tools.py

@@ -0,0 +1,22 @@
+from unittest.mock import MagicMock
+from gitea.client import GiteaClient
+from gitea.tools.git_tools import GitTools
+
+
+def test_create_branch_success() -> None:
+    mock_client: MagicMock = MagicMock(spec=GiteaClient)
+    mock_client.create_ref.return_value = {}
+
+    git_tools: GitTools = GitTools(mock_client)
+    res: str = git_tools.create_branch("owner", "repo", "ref", "sha")
+    assert res == "Branch 'ref' created successfully in owner/repo."
+    mock_client.create_ref.assert_called_once_with("owner", "repo", "ref", "sha")
+
+
+def test_create_branch_failure() -> None:
+    mock_client: MagicMock = MagicMock(spec=GiteaClient)
+    mock_client.create_ref.side_effect = Exception("API Error")
+
+    git_tools: GitTools = GitTools(mock_client)
+    res: str = git_tools.create_branch("owner", "repo", "ref", "sha")
+    assert res == "Error creating branch: API Error"