def test_parameters_features():
par0 = Parameters({})
par1 = Parameters({'olaf': 'schneemann'})
assert len(par0) == 0
assert len(par1) == 1
assert not par0
assert par1
assert 'olaf' not in par0
assert 'olaf' in par1
assert par0.get('olaf') is None
assert par1.get('olaf') == 'schneemann'
with pytest.raises(KeyError):
_ = par0['olaf']
assert par1['olaf'] == 'schneemann'
assert list(par0) == list(par0.keys()) == list(par0.values()) == list(
par0.items()) == []
assert list(par1) == list(par1.keys()) == ['olaf']
assert list(par1.values()) == ['schneemann']
assert list(par1.items()) == [('olaf', 'schneemann')]
def test_paramters_invalid(data):
with pytest.raises(TypeError, match="expected dict"):
_ = Parameters(data)