def test_unit_interface_init_from_display_unit():
sales_unit = SalesUnit(name="Test", symbol="tst")
display_unit = DisplayUnit(name="Test2",
symbol="t2",
internal_unit=sales_unit)
unit = UnitInterface(display_unit=display_unit)
assert unit.display_unit == display_unit
assert unit.internal_unit == sales_unit
def get_g_in_kg_unit(decimals, display_decimals, comparison=100):
return UnitInterface(
display_unit=DisplayUnit(internal_unit=get_kilogram_sales_unit(
decimals=decimals),
ratio=Decimal('0.001'),
decimals=display_decimals,
symbol='g',
comparison_value=comparison))
def test_unit_interface_init_unit_compatibility_check():
su1 = SalesUnit(identifier="SU1", symbol="su1")
su2 = SalesUnit(identifier="SU2", symbol="su2")
du = DisplayUnit(name="DU", symbol="du", internal_unit=su1)
UnitInterface(su1, du) # OK
with pytest.raises(AssertionError) as exc_info:
UnitInterface(su2, du)
assert str(exc_info.value) == (
"Incompatible units: <SalesUnit:None-SU2>, <DisplayUnit:None>")
def test_kg_in_oz():
kg_oz = UnitInterface(display_unit=DisplayUnit(
internal_unit=get_kilogram_sales_unit(decimals=9),
ratio=Decimal('0.028349523'),
decimals=3, symbol='oz'))
assert kg_oz.comparison_quantity == Decimal('0.028349523')
assert kg_oz.render_quantity('0.028349523') == '1.000oz'
assert kg_oz.render_quantity(1) == '35.274oz'
assert kg_oz.render_quantity(0.001) == '0.035oz'
assert kg_oz.from_display(Decimal('0.001')) == Decimal('0.000028350')
assert kg_oz.to_display(Decimal('0.000028350')) == approx('0.001')
def test_kg_in_oz():
kg_oz = UnitInterface(
display_unit=DisplayUnit(
internal_unit=get_kilogram_sales_unit(decimals=9), ratio=Decimal("0.028349523"), decimals=3, symbol="oz"
)
)
assert kg_oz.comparison_quantity == Decimal("0.028349523")
assert kg_oz.render_quantity("0.028349523") == "1.000oz"
assert kg_oz.render_quantity(1) == "35.274oz"
assert kg_oz.render_quantity(0.001) == "0.035oz"
assert kg_oz.from_display(Decimal("0.001")) == Decimal("0.000028350")
assert kg_oz.to_display(Decimal("0.000028350")) == approx("0.001")
def test_display_unit_validator():
sales_unit = SalesUnit.objects.create()
display_unit = DisplayUnit(internal_unit=sales_unit, ratio=0)
with pytest.raises(ValidationError):
display_unit.full_clean()
def test_display_unit_validator():
sales_unit = SalesUnit.objects.create()
display_unit = DisplayUnit(internal_unit=sales_unit, ratio=0)
with pytest.raises(ValidationError):
display_unit.full_clean()