Simon Willison’s Weblog

8 items tagged “pytest”

2021

PAGNIs: Probably Are Gonna Need Its

Luke Page has a great post up with his list of YAGNI exceptions.

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Blazing fast CI with pytest-split and GitHub Actions (via) pytest-split is a neat looking variant on the pattern of splitting up a test suite to run different parts of it in parallel on different machines. It involves maintaining a periodically updated JSON file in the repo recording the average runtime of different tests, to enable them to be more fairly divided among test runners. Includes a recipe for running as a matrix in GitHub Actions. # 22nd February 2021, 7:06 pm

2020

A cookiecutter template for writing Datasette plugins

Datasette’s plugin system is one of the most interesting parts of the entire project. As I explained to Matt Asay in this interview, the great thing about plugins is that Datasette can gain new functionality overnight without me even having to review a pull request. I just need to get more people to write them!

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How to cheat at unit tests with pytest and Black

I’ve been making a lot of progress on Datasette Cloud this week. As an application that provides private hosted Datasette instances (initially targeted at data journalists and newsrooms) the majority of the code I’ve written deals with permissions: allowing people to form teams, invite team members, promote and demote team administrators and suchlike.

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2019

Porting Datasette to ASGI, and Turtles all the way down

This evening I finally closed a Datasette issue that I opened more than 13 months ago: #272: Port Datasette to ASGI. A few notes on why this is such an important step for the project.

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parameterized. I love the @parametrize decorator in pytest, which lets you run the same test multiple times against multiple parameters. The only catch is that the decorator in pytest doesn’t work for old-style unittest TestCase tests, which means you can’t easily add it to test suites that were built using the older model. I just found out about parameterized which works with unittest tests whether or not you are running them using the pytest test runner. # 19th February 2019, 9:05 pm

2018

Documentation unit tests

Keeping documentation synchronized with an evolving codebase is difficult. Without extreme discipline, it’s easy for documentation to get out-of-date as new features are added.

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Datasette plugins, and building a clustered map visualization

Datasette now supports plugins!

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