fix test regex

spec/models/token_spec.rb

@@ -4,7 +4,7 @@ RSpec.describe Token, type: :model do
   context "#generate_token" do
     subject (:token) { Token.new }
     it "should generate an alphanumeric token of 32 characters" do
-      expect(token.send(:generate_token)).to match /[a-zA-Z0-9]{32}/
+      expect(token.send(:generate_token)).to match /^[a-zA-Z0-9]{32}$/
     end
   end
 end