Rails Rspec allow multiple method call in one line - ruby-on-rails

Question

desc 'Remove credential state users who no longer request for confirm otp within 10 minutes'
task failed_user_cleaner: :environment do
puts "Daily UserRecord Cleaning CronJob started - #{Time.now}"
#user = User.with_state("credentials").with_last_otp_at(Time.now - 10.minutes)
Users::Delete.new(#user).destroy_all
puts "Daily UserRecord Cleaning CronJob ended - #{Time.now}"
end
Above is crop job rake file code.
then I've tried in many times and found in many times.
But I couldn't find the way to write unit test case for above job.
Help me to write test case correctly.
here is my spec code
require 'rails_helper'
describe 'users rake tasks' do
before do
Rake.application.rake_require 'tasks/users'
Rake::Task.define_task(:environment)
end
context 'when remove credential state users who no longer request for confirm otp within 10 minutes' do
let(:user) { create(:user, last_otp_at: Time.now - 11.minutes, state: "credentials") }
let (:run_users_rake_task) do
Rake.application.invoke_task 'users:failed_user_cleaner'
end
it 'calls right service method' do
#users = Users::Delete.new([user])
expect(#users).to receive(:destroy_all)
run_users_rake_task
end
end
end
here is the error log
Failures:
1) users rake tasks when remove credential state users who no longer request for confirm otp within 10 minutes calls right service method
Failure/Error: expect(#users).to receive(:destroy_all)
(#<Users::Delete:0x0000556dfcca3a40 #user=[#<User id: 181, uuid: nil, phone: "[phone]", otp_secret: nil, last_otp_at: "2021-09-30 09:32:24.961548000 +0700", created_at: "2021-09-30 09:43:24.973818000 +0700", updated_at: "2021-09-30 09:43:24.973818000 +0700", email: nil, avatar: "https://dummyimage.com/300x300/f04720/153572.png?t...", refresh_token: "eyJhbGciOiJIUzI1NiJ9.eyJpYXQiOjE2MzI5Njk4MDQsImV4c...", first_name_en: "Jenise", first_name_th: "Damion", last_name_en: "McCullough", last_name_th: "Beatty", nationality: "TH", thai_national_id: nil, thai_laser_code: nil, company_id: 200, role: nil, state: "credentials", date_of_birth: "2020-10-30 00:00:00.000000000 +0700", deleted_at: nil, password_digest: "$2a$04$jfR9X9ci06602tlAyLOoRewTK1lZ12vJ2cZ9Dc2ov4F...", username: "zreejme238", shopname: nil, access_token: nil, locked_at: nil, login_attempts: 0, locale: "th", scorm_completed: false>]>).destroy_all(*(any args))
expected: 1 time with any arguments
received: 0 times with any arguments
# ./spec/tasks/users_spec.rb:19:in `block (3 levels) in <top (required)>'

Answer 1

You are creating two instances of Users::Delete when running this test, one within the test and one within the task. Since the instance within the test is not used, it is incorrect to expect it to receive a message.
Rspec has an expectation, expect_any_instance_of, that will fix this however consider reading the full page since it can create fragile or flaky tests. If you wanted to use this method, your test would look something like:
it 'calls right service method' do
expect_any_instance_of(Users::Delete).to receive(:destroy_all)
run_users_rake_task
end
Personally I'd instead check that the expected users were deleted with something like:
it 'removes the user' do
expect { run_users_rake_task }.to change { User.exists?(id: #user.id) }.to(false)
end

Answer 2

Unless you want to use any_instance_of (which is a code smell) you need to stub the Users::Delete method so that it returns a double and put the expectation on the double:
require 'rails_helper'
describe 'users rake tasks' do
before do
Rake.application.rake_require 'tasks/users'
Rake::Task.define_task(:environment)
end
context 'when remove credential state users who no longer request for confirm otp within 10 minutes' do
let(:user) { create(:user, last_otp_at: Time.now - 11.minutes, state: "credentials") }
let(:run_users_rake_task) do
Rake.application.invoke_task 'users:failed_user_cleaner'
end
let(:double) do
instance_double('Users::Delete')
end
before do
allow(Users::Delete).to receive(:new).and_return(double)
end
it 'calls right service method' do
expect(double).to receive(:destroy_all)
run_users_rake_task
end
end
end
However this really just tells us that the API of the service object is clunky and that you should write a class method which both instanciates and performs:
module Users
class Delete
# ...
def self.destroy_all(users)
new(users).destroy_all
end
end
end
desc 'Remove credential state users who no longer request for confirm otp within 10 minutes'
#...
Users::Delete.destroy_all(#user)
# ...
end
require 'rails_helper'
describe 'users rake tasks' do
# ...
context 'when remove credential state users who no longer request for confirm otp within 10 minutes' do
# ...
it 'calls right service method' do
expect(Users::Delete).to receive(:destroy_all)
run_users_rake_task
end
end
end