def test_conversion_with_symbols(qtbot):
widget = UnitEdit(text='1*b*mm')
show(locals())
syms = widget.getSymbols()
assert set(syms.keys()) == {'b'}
expr = widget.getExpr()
conv = units.convert_to(expr, units.meter)
assert conv == units.meter * Symbol('b') / 1000
assert widget.convertTo('meter') == conv
assert widget.convertTo(units.meter) == conv
def test_invalid_conversion(qtbot):
widget = UnitEdit(text='(1*mm)*b')
show(locals())
syms = widget.getSymbols()
assert set(syms.keys()) == {'b'}
assert (widget.convertTo(units.inch) -
parseUnits('b*5*inch/127')).simplify() == 0
assert (widget.convertTo('kg') - parseUnits('b*mm')).simplify() == 0
assert (widget.convertTo(units.m * units.m) -
parseUnits('b*m/1000')).simplify() == 0
assert (widget.convertTo(units.m) - parseUnits('b*m/1000')).simplify() == 0
widget = UnitEdit(text='2*mm')
show(locals())
assert widget.getSymbols() == dict()
widget.convertTo(units.inch)
assert (widget.convertTo('kg') - parseUnits('2*mm')).simplify() == 0
assert (widget.convertTo(units.m * units.m) -
parseUnits('1*m/500')).simplify() == 0
assert (widget.convertTo(units.m) - parseUnits('1*m/500')).simplify() == 0