test: add coverage for _stderr_console_redirect to verify patching and restoration of module consoles

Author: Cell

tests/test_mcp_server.py

@@ -0,0 +1,24 @@
+"""Tests for gac.mcp.server helpers."""
+
+from gac.mcp.server import _stderr_console_redirect
+
+
+def test_stderr_console_redirect_patches_and_restores():
+    """_stderr_console_redirect swaps module-level consoles to stderr and restores them."""
+    import gac.commit_executor as _ce
+    import gac.grouped_commit_workflow as _gcw
+    import gac.workflow_utils as _wu
+
+    orig_ce = _ce.console
+    orig_gcw = _gcw.console
+    orig_wu = _wu.console
+
+    with _stderr_console_redirect():
+        assert _ce.console is not orig_ce
+        assert _gcw.console is not orig_gcw
+        assert _wu.console is not orig_wu
+        assert _ce.console.stderr is True
+
+    assert _ce.console is orig_ce
+    assert _gcw.console is orig_gcw
+    assert _wu.console is orig_wu