# Test: Solar system (no Hubble, deep deficit)
HPC verification with expansion off and a deep deficit at C. Cost diagnostic on step 0 to compare base vs A5 cost.
## Implementation
`run_tests.py` parses the `test` block below and calls the handler for `script: "hpc_verification"`, which runs `run_verification(params, output_dir, verbose)` from `rst_reality_engine_hpc_verification`. The JSON `params` (steps, seed, expansion_per_tick, deficit_S, deep_deficit_S, cost_diagnostic_step, initial_H) are passed through. Outputs: `tests/results/solar_system/`.
## Test config
```test
{
"test_name": "solar_system",
"script": "hpc_verification",
"params": {
"steps": 45,
"seed": 123,
"expansion_per_tick": 1.0,
"deficit_S": 0.05,
"deep_deficit_S": 1e-4,
"cost_diagnostic_step": 0,
"initial_H": 2.5e-8
}
}
```