<h2>Reliability, testing</h2>
<a href="https://github.com/timkindberg/jest-when">jest-when</a> - mock return values for specific argument. <code>jest.spyOn().mockImplemention()</code> returns the same value no matter what arguments were used.
Dependency drift fitness function - automate upgrades of dependencies, with Dependabot.
<a href="https://dependabot.com">Dependabot</a> - automatically creates pull-requests to upgrade dependencies. Renovate as alternative for GitLab.
<a href="https://stryker-mutator.io">Stryker</a> - evaluates the quality of your tests by mutation testing. It changes the code and check if tests fails. Stryker for JS. Pitest for Java.
<a href="https://github.com/Netflix/chaosmonkey">Chaos Monkey</a> - is a resiliency tool by Netflix that helps applications tolerate random instance failures.
<a href="https://sentry.io/">Sentry</a> - tracking errors, finding out if a commit actually fixed an issue and alert if an issue regresses.
<a href="https://www.shellcheck.net">ShellCheck</a> - a linter for shell scripts.
<h2>Refactoring</h2>
<a href="https://github.com/facebook/jscodeshift">jscodeshift</a> - a toolkit for codemods that helps to transform the codebases dependent on your library to overcome breaking changes. Developed by FB.
Event interception - fork events on old system and build new one incrementally. Copy events, messages or fork HTTP requests e.g. in Ingress.
Parallel run with reconciliation - use tool like Github's Scientist to compare and log results of old and new code, including response time.

Jakub notes • engineering

Technology Radar Volume 23

Reliability, testing

Refactoring