RSpec.describe Kernel do describe "#RE2" do it "returns an RE2::Regexp instance given a pattern" do expect(RE2('w(o)(o)')).to be_a(RE2::Regexp) end it "returns an RE2::Regexp instance given a pattern and options" do re = RE2('w(o)(o)', :case_sensitive => false) expect(re).to be_a(RE2::Regexp) expect(re).to_not be_case_sensitive end end end