How can I split test methods for reuse in multiple case with Minitest?

Question

I blocked for refactor my code in my Minitest files.

I have this example:

test_calls.rb

describe Aircall::Calls do
 before do
  @call_by_id = DefaultAircall::AIRCALL.calls.get_by_id(34043501)
  @call_by_user_id = DefaultAircall::AIRCALL.calls.get_by_user_id(80603)
 end

 describe "By id" do
  it "is Hash" do
    @call_by_id.must_be_instance_of Hash
  end

  it "no error return" do
    @call_by_id['error'].must_be_nil
  end
 end

 describe "by user id" do
  it "is Hash" do
    @call_by_user_id.must_be_instance_of Hash
  end

  it "no error return" do
    @call_by_user_id['error'].must_be_nil
  end
 end
end

test_users.rb

describe Aircall::Users do
describe "By id" do

  before do
    @user_by_id = DefaultAircall::AIRCALL.users.get_by_id(80603)
  end

  it "is Hash" do
    @user_by_id.must_be_instance_of Hash
  end

  it "no error return" do
    @user_by_id['error'].must_be_nil
  end

 end
end

Ideally, I want split my code in another file, like this:

class DefaultTest
 def initialize(element_to_test)
  @element_to_test = element_to_test
 end

 def defaults_tests
  describe "default" do
   it "is Hash" do
    @element_to_test.must_be_instance_of Hash
   end

   it "no error return" do
    @element_to_test['error'].must_be_nil
   end
  end
 end
end

So, I could be import my default tests in my different tests files.

I don't know if it's possible and how. I have succeeded one time I think, but the test don't appear in console. If I call a class method who run some Minitest tests, my task (who run the test) not accounting my default tests.

Answer 1

Great idea Keith Bennett ! Lambda is a good approach.

I have my solution now:

My module with lambda who run default tests: default_tests.rb

module DefaultTest

 Run = ->(*variables_to_test) do
  describe "Default test" do
   variables_to_test.each do |variable|

    it "is Hash" do
      self.class.send(variable).must_be_instance_of Hash
    end

    it "no error return" do
      self.class.send(variable)['error'].must_be_nil
    end

   end
  end
 end

end

test_contacts.rb

module TestAircall
 describe Aircall::Contacts do

  def self.contact_by_id
   @contact_by_id ||= DefaultAircall::AIRCALL.contacts.get_by_id(ENV['TEST_DEFAULT_CONTACT_ID'])
  end

  def self.contact_by_phone_number
   @contact_by_phone_number ||= DefaultAircall::AIRCALL.contacts.get_by_phone_number(ENV['TEST_DEFAULT_PHONE_NUMBER'])
  end

  def self.contact_by_email
   @contact_by_email ||= DefaultAircall::AIRCALL.contacts.get_by_email(ENV['TEST_DEFAULT_EMAIL'])
  end

  DefaultTest::Run.('contact_by_id', 'contact_by_phone_number', 'contact_by_email')
 end
end

test_users.rb

module TestAircall
 describe Aircall::Users do
  def self.user_by_id
   @user_by_id ||= DefaultAircall::AIRCALL.users.get_by_id(ENV['TEST_DEFAULT_USER_ID'])
  end

  DefaultTest::Run.('user_by_id')
 end
end

I can call and run my default tests in every file test for any variable.