import sys, os
ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
if ROOT not in sys.path:
    sys.path.insert(0, ROOT)

from app.core.refrigerant_loader import RefrigerantLibrary
from app.services.cycle_calculator import CycleCalculator


def test_economizer_runs():
    refrigerant = RefrigerantLibrary('R290')
    calc = CycleCalculator(refrigerant)
    evap = 0.2 * 1e5
    cond = 6.0 * 1e5
    inter = 2.0 * 1e5
    res = calc.calculate_cycle_with_economizer(evap, cond, inter, mass_flow=0.1)
    assert 'performance' in res
    assert 'flash_fraction' in res['performance']
    assert 0.0 <= res['performance']['flash_fraction'] <= 1.0