Insert assert

[samuelcolvin]

See this gist and this tweet by @adriangb for rationale.

Waiting for samuelcolvin/pytest-pretty#10

Replaces samuelcolvin/dirty-equals#51 - I've been using this by installing from the pull request for ages, time to make it a proper thing.

[samuelcolvin]

As suggested by @adriangb, this now fails on insert, but but uses a nice symbol in the pytest output.

[codecov]

Codecov Report

Merging #126 (0cbe4e4) into main (f0e0fb2) will decrease coverage by 2.64%.
The diff coverage is 88.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   98.90%   96.27%   -2.64%     
==========================================
  Files           7        8       +1     
  Lines         547      724     +177     
  Branches       76      110      +34     
==========================================
+ Hits          541      697     +156     
- Misses          4       21      +17     
- Partials        2        6       +4     

Impacted Files	Coverage Δ
devtools/pytest_plugin.py	88.13% <88.13%> (ø)
devtools/prettier.py	98.00% <100.00%> (ø)

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[samuelcolvin]

would be nice to try to add support for dirty-equals types (even though this has moved to another repo), in particular:

• stuff where the repr breaks black, the formatting vanishes which is ugly.
• stuff like datetimes close to now and uuids which will change often.

But that can happen later.

[samuelcolvin]

could do with documenting, but I ran out of time 🏃 🙉