def test_add_column():
table = Table()
table.add_column(**valid_schema[0])
table.add_column(**valid_schema[1])
assert table.schema['age'].id == "age"
assert table.schema['name'].type == str
with pytest.raises(TypeError):
table.add_column('height')
def test_add_column_with_existing_data():
table = Table(valid_schema)
table.append(bob)
with pytest.raises(ValueError):
table.add_column('size', str)
def test_duplicate_column():
table = Table(valid_schema)
with pytest.raises(ValueError):
table.add_column('age', int)
