NoMethodError: undefined method `matcher' for class RSpec::ExampleGroups...

[sergiobayona]

require 'rails_helper'

RSpec.describe Projects::NewProjectLinkComponent, type: :component do
  let(:company) { create(:company) }

  let(:kwargs) { { company: company } }

  it { is_expected.to inherit_from ApplicationComponent }

end

Running this raises:

NoMethodError:
  undefined method `matcher' for class RSpec::ExampleGroups::ProjectsNewProjectLinkComponent
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/example_group.rb:752:in `method_missing'
# /Users/sergiobayona/.rbenv/versions/3.3.2/lib/ruby/gems/3.3.0/gems/rspec-viewcomponent-0.1.0/lib/rspec/viewcomponent/context.rb:26:in `block (2 levels) in <module:Context>'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-support-3.12.1/lib/rspec/support/with_keywords_when_needed.rb:22:in `class_exec'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-support-3.12.1/lib/rspec/support/with_keywords_when_needed.rb:22:in `class_exec'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/shared_example_group.rb:38:in `block in include_in'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/example_group.rb:822:in `with_frame'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/shared_example_group.rb:37:in `include_in'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/example_group.rb:386:in `find_and_eval_shared'
# /Users/sergiobayona/.gem/ruby/3.3.0/gems/rspec-core-3.12.2/lib/rspec/core/example_group.rb:344:in `include_context'
# /Users/sergiobayona/.rbenv/versions/3.3.2/lib/ruby/gems/3.3.0/gems/rspec-viewcomponent-0.1.0/lib/rspec/viewcomponent/context.rb:33:in `block in <module:Context>'

[sergiobayona]

matcher definition at https://github.com/ViewComponent/rspec-viewcomponent/blob/main/lib/rspec/viewcomponent/context.rb#L26-L30

should be:

RSpec::Matchers.define :be_rendered do |expected|
  match do |actual|
    expect(actual).to be_render
  end
end

instead of:

  matcher :be_rendered do
    match do |actual|
      expect(actual).to be_render
    end
  end

no? or is it an rspec version issue?

Thanks.

[boardfish]

Hey @sergiobayona, thanks for raising this! This is really interesting – I think it might be environment-dependent, because a much larger repo I work on similarly doesn't let you define matchers in this way and I'm not sure why 🤔 Could you try and get a reduced test case so that I can understand how exactly it's failing?

In the meantime, if we can't figure out the root cause, then I'd be happy to update this gem to support that.