def test_parse():
semver = Semver()
semver.parse('5.0.0-alpha.2.2')
assert semver.major == 5
assert semver.minor == 0
assert semver.patch == 0
assert semver.prefix == '-'
assert semver.tag == 'alpha'
assert semver.number == 2
assert semver.revision == '2'
def test_bad():
semver = Semver()
semver.parse('5.0-alpha.2.2')
