chore: Test worker crash recovery

Author: jhewers-pf

tests/test_process_pool_recovery.py

@@ -0,0 +1,157 @@
+"""
+Tests for process pool crash recovery
+"""
+
+import asyncio
+import os
+import tempfile
+import unittest
+from unittest.mock import MagicMock, patch
+from concurrent.futures import BrokenExecutor, Future
+
+# Set dummy API key for testing
+os.environ["OPENAI_API_KEY"] = "test"
+
+from openevolve.config import Config
+from openevolve.database import Program, ProgramDatabase
+from openevolve.process_parallel import ProcessParallelController, SerializableResult
+
+
+class TestProcessPoolRecovery(unittest.TestCase):
+    """Tests for process pool crash recovery"""
+
+    def setUp(self):
+        """Set up test environment"""
+        self.test_dir = tempfile.mkdtemp()
+
+        # Create test config
+        self.config = Config()
+        self.config.max_iterations = 10
+        self.config.evaluator.parallel_evaluations = 2
+        self.config.evaluator.timeout = 10
+        self.config.database.num_islands = 2
+        self.config.database.in_memory = True
+        self.config.checkpoint_interval = 5
+
+        # Create test evaluation file
+        self.eval_content = """
+def evaluate(program_path):
+    return {"score": 0.5}
+"""
+        self.eval_file = os.path.join(self.test_dir, "evaluator.py")
+        with open(self.eval_file, "w") as f:
+            f.write(self.eval_content)
+
+        # Create test database
+        self.database = ProgramDatabase(self.config.database)
+
+        # Add some test programs
+        for i in range(2):
+            program = Program(
+                id=f"test_{i}",
+                code=f"def func_{i}(): return {i}",
+                language="python",
+                metrics={"score": 0.5},
+                iteration_found=0,
+            )
+            self.database.add(program)
+
+    def tearDown(self):
+        """Clean up test environment"""
+        import shutil
+
+        shutil.rmtree(self.test_dir, ignore_errors=True)
+
+    def test_controller_has_recovery_tracking(self):
+        """Test that controller initializes with recovery tracking attributes"""
+        controller = ProcessParallelController(self.config, self.eval_file, self.database)
+
+        self.assertEqual(controller.recovery_attempts, 0)
+        self.assertEqual(controller.max_recovery_attempts, 3)
+
+    def test_recover_process_pool_recreates_executor(self):
+        """Test that _recover_process_pool recreates the executor"""
+        controller = ProcessParallelController(self.config, self.eval_file, self.database)
+
+        # Start the controller to create initial executor
+        controller.start()
+        self.assertIsNotNone(controller.executor)
+        original_executor = controller.executor
+
+        # Simulate recovery
+        with patch("time.sleep"):
+            controller._recover_process_pool()
+
+        # Verify executor was recreated
+        self.assertIsNotNone(controller.executor)
+        self.assertIsNot(controller.executor, original_executor)
+
+        # Clean up
+        controller.stop()
+
+    def test_broken_executor_triggers_recovery_and_resets_on_success(self):
+        """Test that BrokenExecutor triggers recovery and counter resets on success"""
+
+        async def run_test():
+            controller = ProcessParallelController(self.config, self.eval_file, self.database)
+
+            # Track recovery calls
+            recovery_called = []
+
+            def mock_recover(failed_iterations=None):
+                recovery_called.append(failed_iterations)
+
+            controller._recover_process_pool = mock_recover
+
+            # First call raises BrokenExecutor, subsequent calls succeed
+            call_count = [0]
+
+            def mock_submit(iteration, island_id):
+                call_count[0] += 1
+                mock_future = MagicMock(spec=Future)
+
+                if call_count[0] == 1:
+                    # First future raises BrokenExecutor when result() is called
+                    mock_future.done.return_value = True
+                    mock_future.result.side_effect = BrokenExecutor("Pool crashed")
+                else:
+                    # Subsequent calls succeed
+                    mock_result = SerializableResult(
+                        child_program_dict={
+                            "id": f"child_{call_count[0]}",
+                            "code": "def evolved(): return 1",
+                            "language": "python",
+                            "parent_id": "test_0",
+                            "generation": 1,
+                            "metrics": {"score": 0.7},
+                            "iteration_found": iteration,
+                            "metadata": {"island": island_id},
+                        },
+                        parent_id="test_0",
+                        iteration_time=0.1,
+                        iteration=iteration,
+                    )
+                    mock_future.done.return_value = True
+                    mock_future.result.return_value = mock_result
+                    mock_future.cancel.return_value = True
+
+                return mock_future
+
+            with patch.object(controller, "_submit_iteration", side_effect=mock_submit):
+                controller.start()
+
+                # Run evolution - should recover from crash and reset counter on success
+                await controller.run_evolution(
+                    start_iteration=1, max_iterations=2, target_score=None
+                )
+
+            # Verify recovery was triggered
+            self.assertEqual(len(recovery_called), 1)
+            # Verify counter was reset after successful iteration
+            self.assertEqual(controller.recovery_attempts, 0)
+
+        asyncio.run(run_test())
+
+
+if __name__ == "__main__":
+    unittest.main()