def test_invalid_constructs(self):
"""Test invalid Atoms."""
self.assertRaises(TypeError, lambda: Atom(MathObject()))
self.assertRaises(TypeError, lambda: Atom(Couplet(1, 2)))
self.assertRaises(TypeError, lambda: Atom(Set()))
self.assertRaises(TypeError, lambda: Atom(Undef()))
self.assertRaises(TypeError, lambda: Atom([]))
self.assertRaises(TypeError, lambda: Atom([7, '8']))
self.assertRaises(TypeError, lambda: Atom({}))
self.assertRaises(TypeError, lambda: Atom({'one': 9, 2: 'ten'}))
def test_MathObject(self):
"""Create a MathObject."""
# MathObject itself can't be instantiated (it is an abstract base class).
self.assertRaises(TypeError, lambda: MathObject())
self.assertRaises(TypeError, lambda: raise_if_not_mathobjects(1))
self.assertRaises(TypeError, lambda: raise_if_not_mathobjects(*[1]))
