marick - A crust of code (Page 2)

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Where do properties come from?

A not-infrequent response to my skeptical essay [https://www.crustofcode.com/a-reluctant-rebuttal/] on property-based-testing (PBT) is that I left out an important benefit: it makes you think about properties. (I think "invariant" would be a more precise word, but I'll stick with the standard "property&

Property testing does not inspire (my) confidence

In a post [https://buttondown.email/hillelwayne/archive/why-property-testing-finds-bugs-unit-testing-does/] , Hillel Wayne [https://hillelwayne.com/] misunderstands my argument about (not necessarily against) property-based testing (PBT). My fault for talking about it on twitter. Here I’ll try to start the discussion I’ve been wanting to have for a long time.

An example of nested forms, nested changesets, and error handling

It took me some time to get the server-side code behind the following form working. If you want to do something similar, this post may be of use. I welcome comments and would be happy to rewrite my code and this example based on them. There are two Postgres tables

Scannable map or struct assertions

TL;DR: I introduce assert_fields and assert_copy and provide their code. ( Updated 2019-12-22 with a new syntax for assert_copy.) -------------------------------------------------------------------------------- I used to say "All the words in a test should be about the purpose of the test." I'll probably be exploring some

Chained assertions

TL;DR: Chain assertions for scannability. Here's some code [https://github.com/marick/crit19/blob/5a8605cf6ef6d7fda3debb4aba281b97e7976946/test/support/assertions/defchain.ex] to help. -------------------------------------------------------------------------------- I suspect tests are more often scanned than read. When a test unexpectedly fails, I think people often jump to its source. But they

The point of the blog

I've been working on a replacement for Critter4Us, an app I wrote ten years ago for the University of Illinois College of Veterinary Medicine [https://vetmed.illinois.edu/college-organization/veterinary-clinical-medicine/] . It's an app used for scheduling and tracking teaching animals. Reserving a teaching animal is something

Tinkerable Software

This is a post I wrote for Software Testing and Quality Engineering magazine (now https://www.stickyminds.com [StickyMinds.com]) and subsequently published on a long-defunct site of mine. Laurent Bossavit asked that I recreate the web version. It was originally published in 2001. Last night, I dreamt we'

How I Avoid Committing Passwords to Github

TL;DR: My pre-commit-hooks [https://github.com/marick/pre-commit-hooks] repo might help you avoid checking in passwords or other secrets. Also: a suggestion that any secret string should contain NOCOMMIT. -------------------------------------------------------------------------------- I once committed AWS keys to a public Github repository. 24 hours later, ~USD2000 had been spent mining bitcoins.

Enthusiasm

About the ancient Greeks: > Logic was the rage of the day; all over, at the marketplaces, in the streets, in private homes and in public buildings, at all times, sometimes all through the night, people engaged in dialectical disputations and flocked to hear the acknowledged masters of logical argument