RSpec how to test if a method was called

Question

When writing RSpec tests  I find myself writing a lot of code that looks like this in order to ensure that a method was called during the execution of a test  for the sake of argument  let s just say I can t really interrogate the state of the object after the call because the operation the method performs is not easy to see the effect of    describe   foo    it  should call  bar  with appropriate arguments  do     called bar   false     subject stub  bar  with  an argument I want     called bar   true       subject foo     expect called bar  to be true   end end   What I want to know is  Is there a nicer syntax available than this  Am I missing some funky RSpec awesomeness that would reduce the above code down to a few lines  should receive sounds like it should do this but reading further it sounds like that s not exactly what it does

User · Answer

In the new rspec expect syntax this would be   expect subject  to receive  bar  with  an argument I want

User · Answer

it  should call  bar  with appropriate arguments  do   expect subject  to receive  bar  with  an argument I want     subject foo end

User · Answer

The below should work  describe   foo    it  should call  bar  with appropriate arguments  do      subject stub  bar       subject foo      expect subject  to have received  bar  with  Invalid number of arguments     end end   Documentation  https   github com rspec rspec-mocks expecting-arguments

User · Answer

To fully comply with RSpec    3 1 syntax and rubocop-rspec s default option for rule RSpec MessageSpies  here s what you can do with spy      Message expectations put an example s expectation at the start  before you ve invoked the   code-under-test  Many developers prefer using an arrange-act-assert  or given-when-then    pattern for structuring tests  Spies are an alternate type of test double that support this   pattern by allowing you to expect that a message has been received after the fact  using   have received      arrange  invitation   spy  invitation      act  invitation deliver  foo example com      assert  expect invitation  to have received  deliver  with  foo example com     If you don t use rubocop-rspec or using non-default option  You may  of course  use RSpec 3 default with expect   dbl   double  Some Collaborator   expect dbl  to receive  foo  with  foo example com      Official Documentation  https   relishapp com rspec rspec-mocks docs basics spies rubocop-rspec  https   docs rubocop org projects rspec en latest cops rspec  rspecmessagespies

[ruby-on-rails] RSpec: how to test if a method was called?

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