How to test an each loop on scope

[Mehmet BEYDOĞAN]

I have the following code, how can I write unit test for this method? I want to make sure 'foo' method is getting called on users in a scope.

def self.some_method  users = User.some_scope  users.each do |user|    user.foo  end end

Gist: https://gist.github.com/beydogan/8d6e01b68dcda0bb4d07

[Myron Marston]

RSpec.describe User do
  describe ".some_method" do
    it "calls #foo on each user returned by the `some_scope` scope" do
      users = [ instance_spy(User), instance_spy(User) ]
      allow(User).to receive(:some_scope).and_return(users)

      User.some_method

      expect(users).to all have_received(:foo)
    end
  end
end

This isn’t necessarily the best way to test this code. In a real system, I might favor an integration test for this code depending on what the logic of some_scope and foo are, whether or not they are tested elsewhere, etc — but for an isolated unit test it’s about the best you can do.

HTH,
Myron

​

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