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Imagine that we have a very simple React component Hello which greets a user with a message:
1 2 3 4 5 6 7 8 9 10 11 | import React from 'react'; import PropTypes from 'prop-types'; export default function Hello({ name }) { return ( <h3>Hello, {name}!</h3> ); } Hello.propTypes = { name: PropTypes.string.isRequired }; |
ES6 module system is a great addition to JavaScript language, but sometimes it’s at odds with writing tests, because you need to mock imported function. Usual solution is to use Dependency Injection akin to what is used in Angular.JS. You need to wrap the whole module into some function and …
Shared examples are a good tool to describe some complex behavior and reuse it across different parts of a spec. Things get more complicated when you have the same behavior, but it has some slight variations for different contexts. In this case it’s easy to end-up having a bunch of …
I often hear the same question: if Elixir works on the Erlang VM, why not use Erlang for programming web-applications instead of Elixir? The short answer is – you can’t create something akin to Phoenix/Ecto with pure Erlang. Does it mean that Elixir is a totally different language? No, it …
Having real screenshot of a failed integration spec can save hours of debugging. We had screenshot with error on the local development environment, and wanted to have it on Continuous Integration server. Luckily for us, it’s a real no-brainer, if you use CircleCI. There is no need for custom S3 …
During setup of Jasmine 2.0 for AngularJS 1.0.7 application it turned out that they are not compatible. The reason is that Angular 1.0.7 is compatible with the older version of Jasmine – 1.3. And there were several breaking changes in Jasmine private API which was used by AngularJS. There were …
After working with branch per feature for a while any Git-repository becomes a mess of outdated and not finished branches. To deal with this issue, we need to clean-up three kinds of branches: Local branches – our day-to-day working branches References to remote branches – aka origin/branch-name items Actual remote …
Sometimes, it’s required to setup Rails logger for storing logs into several backends. In our case we decided to use Loggly, but also wanted to leave old file-based logging. Despite the actual solution is very simple, it’s hard to find it. The best match on StackOverflow suggests to create some …
Ruby doesn’t have procedural module akin to Python or Perl module. Usually, one uses class methods as a typical way to mimic this functionality. Class methods in Ruby are also very handy for supporting instance methods with fabrics and other common-for-class functionality. This is clearly seen in ActiveRecord::Base with dozens …
VCR is a powerful beast which makes HTTP-request mocking a real no-brainer. If you haven’t tried it before, just do it, it will make your life much easier. VCR works in really simple manner – when you issue request via some HTTP API, at first it records them and on …