Make IsNow relative to current moment of time

[hyzyla]

Issue: #39

Implemented logic that updates the approx value of IsNow for every comparison. Other ideas, that I've considered:

• set the approx value to None and generate now on every comparison. Downside -- hard to make repr
• set the approx value to the current time on __ini__ and do not use it for comparison. Downside -- repr will be lying.
• Remove internal state from IsNow and on every compassion create an instance of class DateTime and use it for comparing with other value. More work, so I started from the easiest one.

The downside of my implementation is that the internal state is changing for every comparison, instead of not having a state at all.

[codecov]

Codecov Report

Merging #40 (4d808a5) into main (2d3c0e5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #40   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          660       666    +6     
  Branches       167       167           
=========================================
+ Hits           660       666    +6     

Impacted Files	Coverage Δ
dirty_equals/_datetime.py	100.00% <100.00%> (ø)

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[samuelcolvin]

LGTM, any idea why pypy is failing?

If you can't work it out, feel free to skip those test cases.

[hyzyla]

Those tests are failing, I think we need to split tests for DateTime and for IsNow. And execute datetime.now() inside of tests body, not in parameterize place:

@pytest.mark.parameterize(...
        pytest.param(datetime.now().isoformat(), IsNow(iso_string=True), True, id='isnow-str-true'),
        pytest.param(datetime(2000, 1, 1).isoformat(), IsNow(iso_string=True), False, id='isnow-str-different'),
)
def test_is_datetime(...): ...

[samuelcolvin]

agreed.

[samuelcolvin]

thanks so much.