require "../spec_helper" Spectator.describe String do # This is a helper method. def random_string(length) chars = ('a'..'z').to_a String.build(length) do |builder| length.times { builder << chars.sample } end end describe "#size" do subject { random_string(10).size } it "is the length of the string" do is_expected.to eq(10) end end end Spectator.describe String do # length is now pulled from value defined by `let`. def random_string chars = ('a'..'z').to_a String.build(length) do |builder| length.times { builder << chars.sample } end end describe "#size" do let(length) { 10 } # random_string uses this. subject { random_string.size } it "is the length of the string" do is_expected.to eq(length) end end end module StringHelpers def random_string chars = ('a'..'z').to_a String.build(length) do |builder| length.times { builder << chars.sample } end end end Spectator.describe String do include StringHelpers describe "#size" do let(length) { 10 } subject { random_string.size } it "is the length of the string" do is_expected.to eq(length) end end end