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"""Tests for the ``sympy.physics.biomechanics._mixin.py`` module."""
import pytest
from sympy.physics.biomechanics._mixin import _NamedMixin
class TestNamedMixin:
@staticmethod
def test_subclass():
class Subclass(_NamedMixin):
def __init__(self, name):
self.name = name
instance = Subclass('name')
assert instance.name == 'name'
@pytest.fixture(autouse=True)
def _named_mixin_fixture(self):
class Subclass(_NamedMixin):
def __init__(self, name):
self.name = name
self.Subclass = Subclass
@pytest.mark.parametrize('name', ['a', 'name', 'long_name'])
def test_valid_name_argument(self, name):
instance = self.Subclass(name)
assert instance.name == name
@pytest.mark.parametrize('invalid_name', [0, 0.0, None, False])
def test_invalid_name_argument_not_str(self, invalid_name):
with pytest.raises(TypeError):
_ = self.Subclass(invalid_name)
def test_invalid_name_argument_zero_length_str(self):
with pytest.raises(ValueError):
_ = self.Subclass('')
def test_name_attribute_is_immutable(self):
instance = self.Subclass('name')
with pytest.raises(AttributeError):
instance.name = 'new_name'
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