CODEWITHSUNDEEP
ruby-on-railsrubyminitest
mr_muscle
mr_muscle

Reputation: 2910

Rails MiniTest after_create callback

I'm experimenting with TDD and MiniTest. Now I want to test simple after_create callback which will be pretty easy in RSpec but not so simple I guess with MiniTest. I've got below User and Wallet model:

class User < ApplicationRecord
  after_create :create_wallet

  has_one :wallet, dependent: :destroy
end


class Wallet < ApplicationRecord
  belongs_to :user
end

How to test after_create with MiniTest? I have my doubts whether I should be doing this at all but well... I think this is a part of TDD.

Upvotes: 1

Views: 761

Answers (1)

Lam Phan
Lam Phan

Reputation: 3811

i think you should test that the method :create_wallet will be called only one time after a user created. Then for sure you could create another test case for the method :create_wallet itself.

require "test_helper"
require "active_support/testing/method_call_assertions"

class UserTest < ActiveSupport::TestCase
  include ActiveSupport::Testing::MethodCallAssertions

  test "after create callback" do
    user = User.new(...)
    assert_called(user, :create_wallet, times: 1) do
      user.save
    end
  end

  test "create wallet" do
    user = User.new(...)
    assert_changes -> {user.wallet.blank?}, from: true, to: false do
      user.save
    end

    # or assert_equal
    user = User.create(...) 
    assert_equal Wallet.last.user_id, user.id
    assert_equal 1, Wallet.where(user_id: user.id).count
  end
end

Upvotes: 3

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