Basic tests to for timespan serialization

serialize_timespan.py

Python 2.7.16 (v2.7.16:413a49145e, Mar  4 2019, 01:37:19) [MSC v.1500 64 bit (AMD64)] on win32
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>>> from datetime import datetime, timedelta

# Store start
>>> start = datetime.now()

# Get timespan by subtracting start from now
>>> elapsed = datetime.now() - start

# total_seconds can roundtrip to/from string
>>> elapsed.total_seconds()
14.94

# Dump full value for comparision
>>> elapsed.__str__()
'0:00:14.940000'

# Deserialize from string total_seconds back into timedelta
>>> from_string = timedelta(seconds=14.94)

# Validate
>>> from_string.total_seconds()
14.94

# Validate (matches original)
>>> from_string.__str__()
'0:00:14.940000'