def test_register_prefix_LUT(setup_and_clean_DQ_with_basic_Translator):
with pytest.raises(KeyError):
q_fanta = DQ('1 qm') # `m` is known, but prefix `q` not
fantasy_prefix_LUT = {'q': 3.14}
translator = Translator()
translator.register_prefix_LUT(fantasy_prefix_LUT)
DQ.register_translator(translator)
assert (DQ('1 qm') == DQ('314 cm')) # `c` prefix is still known
def test_register_unit_LUT(setup_and_clean_DQ_with_basic_Translator):
with pytest.raises(KeyError):
q_fanta = DQ('1 fanta') # this unit doesn't exist hence the KeyError
fantasy_unit_LUT = {'fanta': DQ('2.54 cm')}
translator = Translator()
translator.register_unit_LUT(fantasy_unit_LUT)
DQ.register_translator(translator)
q_si = 2 * DQ('2.54 cm')
q_fanta = DQ('2 fanta') # now it does exist
assert (q_si == q_fanta)
def test_register_prefix_LUT_override(
setup_and_clean_DQ_with_basic_Translator):
with pytest.raises(KeyError):
q_fanta = DQ('1 qm') # `m` is known, but prefix `q` not
q_before_override = DQ('314 cm')
fantasy_prefix_LUT = {'q': 3.14}
translator = Translator()
translator.register_prefix_LUT(fantasy_prefix_LUT, override=True)
DQ.register_translator(translator)
assert (DQ('1 qm') == q_before_override)
with pytest.raises(KeyError):
q_after_override = DQ('314 cm')
def test_register_unit_LUT_override(setup_and_clean_DQ_with_basic_Translator):
# the `setup_and_clean_DQ_with_basic_Translator` ensures
# DQ doesn't suddenly come with weird LUTs preregistered
# despite the following having been registered in a prev test;
# in other words, this is supposed to test whether the teardown was executed correctly
with pytest.raises(KeyError):
q_fanta = DQ('1 fanta') # this unit doesn't exist hence the KeyError
pre_T = DQ._T
q_si_before_overwritten = 2 * DQ('2.54 cm')
fantasy_unit_LUT = {'fanta': DQ('2.54 cm')}
translator = Translator()
translator.register_unit_LUT(fantasy_unit_LUT, override=True)
DQ.register_translator(translator)
assert (id(pre_T) != DQ._T) # since overwritten
q_fanta = DQ('2 fanta') # now it does exist
assert (q_si_before_overwritten == q_fanta)
with pytest.raises(KeyError):
q_si_after_overwritten = DQ(
'2.54 cm') # no longer recognized because LUT is overwritten
def test_register_prefix_LUT_with_more_than_1_letter(
setup_and_clean_DQ_with_basic_Translator):
notimplemented_prefix = {'da': 10}
translator = Translator()
with pytest.raises(NotImplementedError):
translator.register_prefix_LUT(notimplemented_prefix)
def test_register_prefix_LUT_with_already_existing(
setup_and_clean_DQ_with_basic_Translator):
redundant_unit_LUT = {'m': 1e-2 / 10}
translator = Translator()
with pytest.raises(ValueError):
translator.register_prefix_LUT(redundant_unit_LUT)
def translator():
yield Translator()