Add comprehensive tests for TLS certificate support

- Test default verify=True behavior
- Test verify=False behavior for insecure connections
- Test custom certificate bundle path
- Test token requirement validation
- Test hostname validation

Co-authored-by: aegilops <41705651+aegilops@users.noreply.github.com>

Author: Copilot

test_tls_cert_support.py

@@ -0,0 +1,71 @@
+"""Test TLS certificate bundle support in githubapi module."""
+
+import pytest
+from unittest.mock import patch, MagicMock
+import os
+
+
+def test_github_verify_default():
+    """Test that GitHub class defaults to verify=True."""
+    with patch.dict(os.environ, {"GITHUB_TOKEN": "test_token"}):
+        with patch("githubapi.requests.Session") as mock_session_class:
+            mock_session = MagicMock()
+            mock_session_class.return_value = mock_session
+            
+            from githubapi import GitHub
+            
+            gh = GitHub()
+            
+            # Verify that session.verify is set to True by default
+            assert mock_session.verify == True
+
+
+def test_github_verify_false():
+    """Test that GitHub class accepts verify=False."""
+    with patch.dict(os.environ, {"GITHUB_TOKEN": "test_token"}):
+        with patch("githubapi.requests.Session") as mock_session_class:
+            mock_session = MagicMock()
+            mock_session_class.return_value = mock_session
+            
+            from githubapi import GitHub
+            
+            gh = GitHub(verify=False)
+            
+            # Verify that session.verify is set to False
+            assert mock_session.verify == False
+
+
+def test_github_verify_cert_bundle():
+    """Test that GitHub class accepts verify with certificate bundle path."""
+    with patch.dict(os.environ, {"GITHUB_TOKEN": "test_token"}):
+        with patch("githubapi.requests.Session") as mock_session_class:
+            mock_session = MagicMock()
+            mock_session_class.return_value = mock_session
+            
+            from githubapi import GitHub
+            
+            cert_path = "/path/to/cert.pem"
+            gh = GitHub(verify=cert_path)
+            
+            # Verify that session.verify is set to the certificate path
+            assert mock_session.verify == cert_path
+
+
+def test_github_token_required():
+    """Test that GitHub class requires a token."""
+    with patch.dict(os.environ, {}, clear=True):
+        with pytest.raises(ValueError, match="GITHUB_TOKEN environment variable must be set"):
+            from githubapi import GitHub
+            gh = GitHub()
+
+
+def test_github_hostname_validation():
+    """Test that GitHub class validates hostname."""
+    with patch.dict(os.environ, {"GITHUB_TOKEN": "test_token"}):
+        with pytest.raises(ValueError, match="Invalid server hostname"):
+            from githubapi import GitHub
+            gh = GitHub(hostname="invalid hostname with spaces")
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])