Why do I get an undefined method 'have' error when running Rspec?
factory-bot, rspec, ruby-on-rails, ruby-on-rails-4
Solution
The `have` family of matchers was deprecated in RSpec 2.99 and has been moved to a separate rspec-collection_matchers gem as of RSpec 3.0. This is discussed in https://rspec.info/blog/2013/11/rspec-2-99-and-3-0-betas-have-been-released/, which also gives the suggested approach to migrating to 3.0. Specifically, it recommends installing/using RSpec 2.99 in order to see the deprecation messages associated with items that were removed/moved in 3.0.
Problem
I recently upgraded to Rails 4 and everything works fine except for my Rspec tests. ``` require 'spec_helper' describe Invoice do before :each do @user = FactoryGirl.create(:activated_user) person = FactoryGirl.create(:person, :user => @user, :company => nil) @project = FactoryGirl.create(:project, :user => @user, :person_ids => [person.id], :invoice_recipient_id => person.id) end it "has a valid factory" do expect(FactoryGirl.build(:invoice, :project => @project, :user => @user)).to be_valid end it "is invalid without a number" do expect(FactoryGirl.build(:invoice, :project => @project, :user => @user, :number => nil)).to have(1).errors_on(:number) end end ``` When running these tests I get this error: ``` Failure/Error: expect(FactoryGirl.build(:invoice, :project => @project, :user => @user, :number => nil)).to have(1).errors_on(:number) NoMethodError: undefined method `have' for #<RSpec::ExampleGroups::Invoice_2:0x009ge29360d910> # ./spec/models/invoice_spec.rb:16:in `block (2 levels) in <top (required)>' ``` Can anybody tell me what I am missing here? I googled it already but nothing came up. The `have` method is actually fairly standard in Rspec and I can't see why it shouldn't work. Thanks for any pointers.