This content originally appeared on DEV Community and was authored by SakuraMilkTea
Writing test code is good form and is obviously always recommended. Writing GOOD test is an excellent way to fool-proof the code you (I) have so far, but like everything else, it takes practice!
In an attempt to keep it fresh in my mind, here are a few things I found out recently about writing rspec code...
-
travel_tois useful... But only allowed once.
Okay. That was a bit dramatic. You can actually use travel_to in separate blocks as much as you want.
context "first context" do
travel_to("2024-12-25") do
expect(presents)
end
end
context "second context" do
travel_to("2024-12-31") do
expect(fireworks)
end
end
However, you're (I am) not allowed to do some magical shenanigans such as this
context "first context" do
travel_to("2024-12-25") do
expect(presents)
travel_to("2024-12-31") do
expect(fireworks)
end
end
end
Not only does it look weird and messy, but also you'll get a big angry error. So yeah.
However in some cases it will be inevitable for the whole file to be enclosed in a travel_to for some reason or other. And that's when it's a good idea to use travel_back!
context "first context" do
travel_to("2024-12-25") do
expect(presents)
context "second context" do
before do
travel_back
end
travel_to("2024-12-31") do
expect(fireworks)
end
end
end
end
Simple? Yes. But does it do a good job? Also yes.
- It's better to not write DSLs dynamically
This one might come as a surprise for some, because it sure did for me. Consider this example
describe 'some spec' do
(1..7).each do |n|
let!(:"user_#{n}") { create(:user, name: "user#{n}") }
end
# ...
end
I thought I was super clever to use iteration like that, but learned from reviewers that it's not good practice. Although it saves time and works fine, it's not reader-friendly.
Instead, a very similar approach can be used through FactoryBot
describe 'some spec' do
let!(:users) { FactoryBot.create_list(:user, 7) }
# ...
end
This obviously assumes that the name is set in the FactoryBot file
FactoryBot.define do
factory :user do
sequence(:name) { |n| "user#{n}" }
# ...
end
end
As I become more acquainted with rspec and keep writing more code, I might come back and edit this document with more interesting finds ☺︎
Let's keep doing our best!
This content originally appeared on DEV Community and was authored by SakuraMilkTea
SakuraMilkTea | Sciencx (2024-06-27T14:24:35+00:00) Interesting Things I learned Writing Rspec Tests. Retrieved from https://www.scien.cx/2024/06/27/interesting-things-i-learned-writing-rspec-tests/
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