[Improvement] improve github loader (#984)

tests/loaders/test_github.py

@@ -0,0 +1,33 @@
+import pytest
+
+from embedchain.loaders.github import GithubLoader
+
+
+@pytest.fixture
+def mock_github_loader_config():
+    return {
+        "token": "your_mock_token",
+    }
+
+
+@pytest.fixture
+def mock_github_loader(mocker, mock_github_loader_config):
+    mock_github = mocker.patch("github.Github")
+    _ = mock_github.return_value
+    return GithubLoader(config=mock_github_loader_config)
+
+
+def test_github_loader_init(mocker, mock_github_loader_config):
+    mock_github = mocker.patch("github.Github")
+    GithubLoader(config=mock_github_loader_config)
+    mock_github.assert_called_once_with("your_mock_token")
+
+
+def test_github_loader_init_empty_config(mocker):
+    with pytest.raises(ValueError, match="requires a personal access token"):
+        GithubLoader()
+
+
+def test_github_loader_init_missing_token():
+    with pytest.raises(ValueError, match="requires a personal access token"):
+        GithubLoader(config={})