def create_version_info_from_str():
v = VersionInfo.from_str("1.2.3")
assert v.major == 1
assert v.minor == 2
assert v.micro == 3
assert v.releaselevel == "final"
assert v.serial == 0
v = VersionInfo.from_str("1.2.3a4")
assert v.major == 1
assert v.minor == 2
assert v.micro == 3
assert v.releaselevel == "alpha"
assert v.serial == 4
v = VersionInfo.from_str("1.2.3beta4")
assert v.major == 1
assert v.minor == 2
assert v.micro == 3
assert v.releaselevel == "beta"
assert v.serial == 4
v = VersionInfo.from_str("12.34.56rc789")
assert v.major == 12
assert v.minor == 34
assert v.micro == 56
assert v.releaselevel == "candidate"
assert v.serial == 789
def serialize_as_str():
v = VersionInfo(1, 2, 3, "final", 0)
assert str(v) == "1.2.3"
v = VersionInfo(1, 2, 3, "alpha", 4)
assert str(v) == "1.2.3a4"
v = VersionInfo(1, 2, 3, "candidate", 4)
assert str(v) == "1.2.3rc4"
def create_version_info_from_fields():
v = VersionInfo(1, 2, 3, "alpha", 4)
assert v.major == 1
assert v.minor == 2
assert v.micro == 3
assert v.releaselevel == "alpha"
assert v.serial == 4