Mocking a class with Minitest without an extra gem

Luiz Eduardo Kowalski — Sat, 20 Jan 2024 11:01:56 +0000

I have a job that does only one thing: it runs this method

def perform
  PgHero.capture_query_stats
end

Now, on testing, I don't really want to execute capture_query_stats, I just need to ensure the method was invoked.

I tried to stub capture_query_stats using PgHero.stub(:capture_query_stats, true), but still, not exactly what I wanted since I can't verify if a stub was called or not; only a mock can do that.

I found different gems that could do something like that, but I wanted to see if I could do this without any gem, and it turns out, I can!

I can use stub_const helper to stub the actual PgHero class and return a mock object with capture_query_stats and then verify the mock:

test "captures query stats" do
  mock = Minitest::Mock.new
  mock.expect :capture_query_stats, true

  stub_const(Object, :PgHero, mock) do
    CaptureQueryStatsJob.perform_now

    mock.verify
  end
end

No additional gem, only what Rails provides

How to migrate from Docker Desktop to Colima on a Mac M1

Luiz Eduardo Kowalski — Sat, 25 Mar 2023 15:56:52 +0000

Recently, I've been trying to move away from Docker Desktop for Mac and I think I finally got it working so here is what I did:

Uninstall Docker Desktop
Delete ~/.docker/config.json (Don't worry, Colima will recreate it correctly)
Install docker-cli with Homebrew

brew install --formula docker

Install colima

brew install colima

Setup a VM

colima start -a x86_64

You are only gonna need to run start with options this time, next time, colima start is enough.

Install BuildKit for Mac with the following script

#!/bin/bash

ARCH=arm64
VERSION=v0.10.4
curl -LO https://github.com/docker/buildx/releases/download/${VERSION}/buildx-${VERSION}.darwin-${ARCH}
mkdir -p ~/.docker/cli-plugins
mv buildx-${VERSION}.darwin-${ARCH} ~/.docker/cli-plugins/docker-buildx
chmod +x ~/.docker/cli-plugins/docker-buildx
docker buildx version

And that's it 🎉

DEV Community: Luiz Eduardo Kowalski

Mocking a class with Minitest without an extra gem

How to migrate from Docker Desktop to Colima on a Mac M1