# Run with:
#   blender -b --python D7813_stress_test.py

import random
from bpy.utils.units import to_value

TESTS = 10000
SEED = 321

choose_numbers = (
    "2", "2e-2", "2e+2", "2e+2", "0.2e+2", "0.2e+2_2",
    # Parenthesized.
    "(0.2-2_2)", "(0.2+2_2)", "(0.2e-2_2)", "(0.2e+2_2)",
)
choose_ops = ("-", "+", "*")
choose_spaces = ("", " ")


from bpy import context
unit_system = context.scene.unit_settings.system
unit_category = 'LENGTH'

random.seed(SEED)
for i in range(TESTS):
    values = []
    for i in range(random.randint(2, 24)):
        if i != 0:
            values.append(random.choice(choose_ops))
        values.append(random.choice(choose_spaces))
        values.append(random.choice(choose_numbers))
    expr = "".join(values)
    value_unit = to_value(unit_system, unit_category, expr)
    value_python = eval(expr)

    assert(value_unit == value_python)