Prefer fallback for Gemini CloudCode rate limits

tests/agent/test_gemini_fast_fallback.py

@@ -0,0 +1,62 @@
+"""Regression tests for #13636 — CloudCode / Gemini CLI rate-limit fallback.
+
+_pool_may_recover_from_rate_limit() is the hinge between credential-pool
+rotation and fallback-provider activation.  For CloudCode (Gemini CLI /
+Gemini OAuth) the 429 is an account-wide throttle, so waiting for pool
+rotation is pointless — prefer fallback immediately.
+"""
+from unittest.mock import MagicMock
+
+from run_agent import _pool_may_recover_from_rate_limit
+
+
+def _pool(entries: int = 2):
+    p = MagicMock()
+    p.has_available.return_value = True
+    p.entries.return_value = list(range(entries))
+    return p
+
+
+def test_cloudcode_provider_skips_pool_rotation():
+    assert _pool_may_recover_from_rate_limit(
+        _pool(entries=3),
+        provider="google-gemini-cli",
+        base_url="cloudcode-pa://google",
+    ) is False
+
+
+def test_cloudcode_base_url_skips_pool_rotation_even_on_alias_provider():
+    # Even if the provider label is something else, a cloudcode-pa:// URL
+    # signals the account-wide quota regime.
+    assert _pool_may_recover_from_rate_limit(
+        _pool(entries=3),
+        provider="custom-provider",
+        base_url="cloudcode-pa://google",
+    ) is False
+
+
+def test_non_cloudcode_multi_entry_pool_still_recovers():
+    assert _pool_may_recover_from_rate_limit(
+        _pool(entries=3),
+        provider="openrouter",
+        base_url="https://openrouter.ai/api/v1",
+    ) is True
+
+
+def test_single_entry_pool_skips_rotation_regardless_of_provider():
+    # Pre-existing single-entry-pool exception (#11314) still holds.
+    assert _pool_may_recover_from_rate_limit(
+        _pool(entries=1),
+        provider="openrouter",
+        base_url="https://openrouter.ai/api/v1",
+    ) is False
+
+
+def test_exhausted_pool_skips_rotation():
+    p = MagicMock()
+    p.has_available.return_value = False
+    assert _pool_may_recover_from_rate_limit(p) is False
+
+
+def test_no_pool_skips_rotation():
+    assert _pool_may_recover_from_rate_limit(None) is False