- Generated by
1.15.0
|
STAR
Cal STAR — firmware, DAQ server, and engine design
|
Variables | |
| IN_TABLES = dict(p=1.0e7, T=300.0) | |
| list | PAST_THE_TABLES |
The fallback chain, and refusing to answer when there is no honest answer. The chain is the design (see :mod:`feedtwin.props.fluid`): fast tables first, the equation of state behind them, measured data in front when there is any. These tests hold it to the two promises that make it safe to rely on -- * a state point the fast backend cannot reach is **served by the next one**, not failed and not guessed at; and * a state point *nothing* can serve **raises**, naming what each backend said, rather than returning a number. The second matters more than it looks. Every backend in this package refuses outside its envelope, so the only way a wrong number gets out is if this layer invents one.
| None test_props_chain.test_a_declared_liquid_is_solved_as_a_liquid | ( | ) |
The default is *not* to infer phase from ``(p, T)``. Asking the property layer to decide has failed twice here from two different causes, and both times silently: oxygen at an ambient default is a gas at 40 kg/m^3 where LOX is 1140, so the leg solves at a thirtieth of the density and every number after it stays plausible. Below the critical point a declared fluid is evaluated on its saturated-liquid line, which cannot come back as a gas whatever pressure the solve is guessing.
Definition at line 188 of file test_props_chain.py.
| None test_props_chain.test_a_network_defaults_to_single_phase | ( | ) |
Definition at line 231 of file test_props_chain.py.
| None test_props_chain.test_a_pressurant_is_untouched_by_the_liquid_rule | ( | ) |
Nitrogen at 4500 psi and room temperature is supercritical -- there is no liquid line to sit on, and forcing one would be nonsense.
Definition at line 221 of file test_props_chain.py.
| None test_props_chain.test_a_state_nothing_can_serve_raises_and_explains | ( | ) |
The error names every backend and what it said.
Definition at line 95 of file test_props_chain.py.
| None test_props_chain.test_accessor_and_get_agree_including_argument_order | ( | ) |
A positional API must honour the order the caller declared.
Definition at line 144 of file test_props_chain.py.
| None test_props_chain.test_accessor_falls_through_the_chain_too | ( | ) |
The fast path must not lose the fallback it was optimised around. The point is off the table and served by the equation of state, so the number is the equation of state's -- not, as it was, a density extrapolated into solid nitrogen. See :data:`PAST_THE_TABLES`.
Definition at line 153 of file test_props_chain.py.
| None test_props_chain.test_an_exhausted_chain_preserves_why | ( | str | label, |
| dict[str, float] | state ) |
A chain of only the tables fails, and the OutOfRange survives as the cause.
Definition at line 87 of file test_props_chain.py.
| None test_props_chain.test_an_unformable_state_lists_the_valid_pairs | ( | ) |
Definition at line 139 of file test_props_chain.py.
| None test_props_chain.test_impossible_inputs_are_rejected_before_any_backend | ( | dict[str, float] | state, |
| str | expected ) |
A negative pressure should say so, not fail inside a root find. Handed p < 0, CoolProp reports that a Brent bracket does not contain a root -- true, useless, and three layers below the mistake. NaN matters even more: it is what a diverging solve produces, and propagating it would turn one bad iteration into a plausible-looking density.
Definition at line 115 of file test_props_chain.py.
| None test_props_chain.test_multiphase_is_opt_in_and_changes_the_answer | ( | ) |
It has to be reachable, and it has to actually do something -- a flag that quietly does nothing is worse than no flag.
Definition at line 208 of file test_props_chain.py.
| None test_props_chain.test_ordinary_states_are_served_by_the_tables | ( | ) |
Definition at line 49 of file test_props_chain.py.
References state.
| None test_props_chain.test_quality_is_none_outside_the_dome_not_a_sentinel | ( | ) |
CoolProp reports -1 or -1000 for "not two-phase"; neither may escape. A sentinel that survives into a mass balance is read as a vapour fraction, and -1000 kg of vapour does not raise anything.
Definition at line 164 of file test_props_chain.py.
| None test_props_chain.test_the_chain_falls_through_to_the_equation_of_state | ( | str | label, |
| dict[str, float] | state ) |
Past the tables, the equation of state answers -- and says it did.
Definition at line 54 of file test_props_chain.py.
References state.
| None test_props_chain.test_the_chain_is_visible | ( | ) |
Which sources a fluid is using is inspectable, not implicit.
Definition at line 176 of file test_props_chain.py.
| None test_props_chain.test_the_tables_refuse_rather_than_extrapolate | ( | str | label, |
| dict[str, float] | state ) |
Pinned on the backend itself, because the whole design leans on it. If the tabulated backend ever started extrapolating instead of raising, every test above would still pass -- the chain would simply never fall through, and would return quietly wrong numbers at the edges. This is the test that would notice. Asserted one level below :class:`Fluid` deliberately: through a fluid, an exhausted chain reports :class:`PropertyError` summarising every backend's reason, which is right for a caller but too coarse to prove *this* backend refused for *this* reason.
Definition at line 64 of file test_props_chain.py.
| None test_props_chain.test_unknown_property_and_unknown_fluid_say_what_is_available | ( | ) |
Definition at line 129 of file test_props_chain.py.
| test_props_chain.IN_TABLES = dict(p=1.0e7, T=300.0) |
Definition at line 23 of file test_props_chain.py.
| list test_props_chain.PAST_THE_TABLES |
Definition at line 42 of file test_props_chain.py.
1.15.0