X_TEST_BUDGET_INVALID
Means
a test memory budget or worker cap env var does not parse
Typical cause
ULTIMATE_TEST_MEMORY_BUDGET is not a size like 3g/512m, or ULTIMATE_TEST_MAX_WORKERS is not a positive integer
Fix
ULTIMATE_TEST_MEMORY_BUDGET=3g x verify # or unset it; ULTIMATE_TEST_MAX_WORKERS takes a positive integer