test_mm_domain_limits fails intermittently due to unhandled memory resource limit error (errorCode 535)

Start with test/integration/component/test_mm_domain_limits.py and inspect test_03_delete_vm, then run the focused nosetests command against the advanced simulator configuration. Verify that errorCode 535 is treated as an expected result, unexpected API errors still fail, and deletion is attempted only when VM creation succeeds.

problem

While working on PR #13490, I noticed the Simulator CI / test job intermittently fails on test_mm_domain_limits (test_03_delete_vm).

The test calls deployVirtualMachine, which fails with CloudStack API errorCode 535: "Maximum amount of resources of Type = 'memory' ... is exceeded". Because the VM was never created, the test then attempts to delete a VM that doesn't exist, causing test_03_delete_vm to fail.

The test does not currently handle this resource-limit API error as a valid/expected outcome.

versions

Apache CloudStack version: main branch (4.23.0.0-SNAPSHOT)
Environment: GitHub Actions Simulator CI (advanced zone), simulator hypervisor — not a real deployment

The steps to reproduce the bug

1. Run the Simulator CI test suite including component/test_mm_domain_limits.py
2. Observe test_03_delete_vm
3. deployVirtualMachine fails with errorCode 535 (memory limit exceeded)
4. Test then attempts to delete a VM that was never created, causing a failure

Can also be reproduced locally with:
nosetests-3.4 --with-marvin --marvin-config=setup/dev/advdualzone.cfg test/integration/component/test_mm_domain_limits.py:test_03_delete_vm -s -a tags=advanced

What to do about it?

Update test_03_delete_vm in test/integration/component/test_mm_domain_limits.py to treat the CloudStack API errorCode 535 (memory resource limit exceeded) as an expected outcome, and only attempt VM deletion if creation succeeded. Example:

try:
vm = VirtualMachine.create(self.apiclient, ...)
vm_created = True
except CloudstackAPIException as ex:
if "errorCode: 535" in str(ex) or "Maximum amount of resources of Type = 'memory'" in str(ex):
vm_created = False
else:
raise

if vm_created:
vm.delete(self.apiclient)

Alternatively, the domain/project memory limit could be raised in test setup if VM creation is expected to succeed in this test.