RSpec before in a helper - ruby-on-rails

Question

Is it possible to do something like this?
module MyHelper
before (:each) do
allow(Class).to receive(:method).and_return(true)
end
end
Then in my tests I could do something like:
RSpec.describe 'My cool test' do
include MyHelper
it 'Tests a Class Method' do
expect { Class.method }.to eq true
end
end
EDIT: This produces the following error:
undefined method `before' for MyHelper:Module (NoMethodError)
Essentially I have a case where many tests do different things, but a common model across off of them reacts on an after_commit which ends up always calling a method which talks to an API. I dont want to GLOBALLY allow Class to receive :method as, sometimes, I need to define it myself for special cases... but I'd like to not have to repeat my allow/receive/and_return and instead wrap it in a common helper...

Answer 1

You can create a hook that is triggered via metadata, for example :type => :api:
RSpec.configure do |c|
c.before(:each, :type => :api) do
allow(Class).to receive(:method).and_return(true)
end
end
And in your spec:
RSpec.describe 'My cool test', :type => :api do
it 'Tests a Class Method' do
expect { Class.method }.to eq true
end
end
You can also pass :type => :api to individual it blocks.

Answer 2

It is possible to do things like you want with feature called shared_context
You could create the shared file with code like this
shared_file.rb
shared_context "stubbing :method on Class" do
before { allow(Class).to receive(:method).and_return(true) }
end
Then you could include that context in the files you needed in the blocks you wanted like so
your_spec_file.rb
require 'rails_helper'
require 'shared_file'
RSpec.describe 'My cool test' do
include_context "stubbing :method on Class"
it 'Tests a Class Method' do
expect { Class.method }.to eq true
end
end
And it will be more naturally for RSpec than your included/extended module helpers. It would be "RSpec way" let's say.

Answer 3

You could separate that code into shared_context and include it into example groups (not examples) like this:
RSpec.describe 'My cool test' do
shared_context 'class stub' do
before (:each) do
allow(Class).to receive(:method).and_return(true)
end
end
describe "here I am using it" do
include_context 'class stub'
it 'Tests a Class Method' do
expect { Class.method }.to eq true
end
end
describe "here I am not" do
it 'Tests a Class Method' do
expect { Class.method }.not_to eq true
end
end
end
Shared context can contain let, helper functions & everything you need except examples.
https://www.relishapp.com/rspec/rspec-core/docs/example-groups/shared-context