def test_validate_site():
valid_site = _validate_site('T', '185')
assert isinstance(valid_site, tuple)
assert valid_site[0] == 'T'
assert valid_site[1] == '185'
valid_site = _validate_site('T', 185)
assert isinstance(valid_site, tuple)
assert valid_site[0] == 'T'
assert valid_site[1] == '185'
def test_validate_invalid_residue2():
_validate_site('T', 'foo')
def test_validate_invalid_residue3():
_validate_site('T', '12.5')
def test_validate_invalid_residue1():
_validate_site('B', '185')