def test_next_beta():
semver = Semver(tag='beta', number=1)
next = semver.next()
assert str(next) == '0.0.0-beta.2'
def test_next_build():
semver = Semver(tag='build', number=1, revision='a2345')
next = semver.next()
assert str(next) == '0.0.0+build.2'
def test_next():
semver = Semver()
next = semver.next()
assert str(next) == '0.0.1'
