add another test where we use higher limit and expect the stress test…

… to pass

tests/runtime/test_runtime_resource.py

@@ -73,3 +73,41 @@ def test_stress_docker_runtime_hit_memory_limits(temp_dir, runtime_cls):
     assert obs.exit_code == 3  # OOM killed!
 
     _close_test_runtime(runtime)
+
+
+def test_stress_docker_runtime_within_memory_limits(temp_dir, runtime_cls):
+    """Test runtime behavior under resource constraints."""
+    runtime, config = _load_runtime(
+        temp_dir,
+        runtime_cls,
+        docker_runtime_kwargs={
+            'cpu_period': 100000,  # 100ms
+            'cpu_quota': 100000,  # Can use 100ms out of each 100ms period (1 CPU)
+            'mem_limit': '4G',  # 4 GB of memory
+            'memswap_limit': '0',  # No swap
+            'mem_swappiness': 0,  # Disable swapping
+            'oom_kill_disable': False,  # Enable OOM killer
+        },
+        runtime_startup_env_vars={
+            'RUNTIME_MAX_MEMORY_GB': '7',
+        },
+    )
+
+    action = CmdRunAction(
+        command='sudo apt-get update && sudo apt-get install -y stress-ng'
+    )
+    logger.info(action, extra={'msg_type': 'ACTION'})
+    obs = runtime.run_action(action)
+    logger.info(obs, extra={'msg_type': 'OBSERVATION'})
+    assert obs.exit_code == 0
+
+    action = CmdRunAction(
+        command='stress-ng --vm 1 --vm-bytes 6G --timeout 30s --metrics'
+    )
+    action.set_hard_timeout(120)
+    logger.info(action, extra={'msg_type': 'ACTION'})
+    obs = runtime.run_action(action)
+    logger.info(obs, extra={'msg_type': 'OBSERVATION'})
+    assert obs.exit_code == 0
+
+    _close_test_runtime(runtime)