What is it_behaves_like?

e.g.

RSpec.describe Hoge, type: :model do
  describe "model validation" do
    subject { new_comment.validate! }

    let(:new_comment) { build :comment }

    describe "comment" do
      context "コメントが空白" do
        before { new_comment.comment = "" }

        it_behaves_like "raise record invalid error"
      end
...

What?

it_behaves_like will call the test-case as template.

Grep your project with the word shared_examples and get it like below:

shared_examples "raise record invalid error" do
  it { expect(&method(:subject)).to raise_error(ActiveRecord::RecordInvalid) }
end