Using Hypothesis to generate date objects and strings

pytesting_hypothesis3.py

import datetime

from hypothesis.strategies import dates
from hypothesis import given
from truth.truth import AssertThat

# Module under test
from app.core.worker import Worker

# Generate dates within the four digit year range
@given(input_date=dates(min_value=datetime.date(1000, 1, 1), max_value=datetime.date(9999, 1, 1)))
def test_worker_parseDate1_generative(mocker, input_date):

    # given
    input_string = input_date.strftime(format="%d%b%Y")  # e.g. 01Jan2000
    worker = Worker()

    # when 
    result = worker.parseDate(input_string)
    
    # then: assert ISO8601 date format
    AssertThat(result).IsInstanceOf(str)
    AssertThat(result).HasSize(10)
    AssertThat(result.split('-')).HasSize(3)