[Fix #9599] Fix an error for Style/CaseLikeIf

[koic]

Fixes #9599.

This PR fixes an error for Style/CaseLikeIf when using include? without a receiver.

---

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

Looks good!

[pderichs]

I was about to post a similiar issue to #9599 after I found a similar situation in an old project.

Thanks for providing a fix @koic 👍

My spec which also seems to catch the situation was looking like this:

diff --git a/spec/rubocop/cop/style/case_like_if_spec.rb b/spec/rubocop/cop/style/case_like_if_spec.rb
index 0d52df5dc..68429a336 100644
--- a/spec/rubocop/cop/style/case_like_if_spec.rb
+++ b/spec/rubocop/cop/style/case_like_if_spec.rb
@@ -66,6 +66,15 @@ RSpec.describe RuboCop::Cop::Style::CaseLikeIf, :config do
     RUBY
   end

+  it 'does not register an offense when using cover? without a receiver' do
+    expect_no_offenses(<<~RUBY)
+      if x == 1
+      elsif cover?(Bar)
+      else
+      end
+    RUBY
+  end
+
   it 'does not register an offense when using `==` with class reference' do
     expect_no_offenses(<<~RUBY)
       if x == Foo

This spec seems to be still failing with these changes with a similar error:

     Failure/Error: node = node.children.last while node.begin_type?
     
     NoMethodError:
       undefined method `begin_type?' for nil:NilClass
     # ./lib/rubocop/cop/style/case_like_if.rb:227:in `deparenthesize'
     # ./lib/rubocop/cop/style/case_like_if.rb:175:in `condition_from_send_node'
     # ./lib/rubocop/cop/style/case_like_if.rb:156:in `collect_conditions'
     # ./lib/rubocop/cop/style/case_like_if.rb:48:in `block in on_if'
     # ./lib/rubocop/cop/style/case_like_if.rb:44:in `each'
     # ./lib/rubocop/cop/style/case_like_if.rb:44:in `on_if'
     # ./lib/rubocop/cop/commissioner.rb:100:in `public_send'
     # ./lib/rubocop/cop/commissioner.rb:100:in `block (2 levels) in trigger_responding_cops'
     # ./lib/rubocop/cop/commissioner.rb:166:in `with_cop_error_handling'
     # ./lib/rubocop/cop/commissioner.rb:99:in `block in trigger_responding_cops'
     # ./lib/rubocop/cop/commissioner.rb:98:in `each'
     # ./lib/rubocop/cop/commissioner.rb:98:in `trigger_responding_cops'
     # ./lib/rubocop/cop/commissioner.rb:69:in `on_if'
     # ./lib/rubocop/cop/commissioner.rb:86:in `investigate'
     # ./lib/rubocop/cop/team.rb:157:in `investigate_partial'
     # ./lib/rubocop/cop/team.rb:83:in `investigate'
     # ./lib/rubocop/rspec/cop_helper.rb:50:in `_investigate'
     # ./lib/rubocop/rspec/cop_helper.rb:21:in `inspect_source'
     # ./lib/rubocop/rspec/expect_offense.rb:178:in `expect_no_offenses'
     # ./spec/rubocop/cop/style/case_like_if_spec.rb:169:in `block (2 levels) in <top (required)>'

[koic]

@pderichs Thank you for quick feedback! I confirmed this and updated this PR!

[pderichs]

Works perfectly. Thank you @koic 🙇‍♂️