2018-fumichan-thesis / form-sample / vendor / bundle / ruby / 2.5.0 / gems / backports-3.11.4 / frozen_old_spec / tags / 1.8.6 / core / math / log_spec.rb

fails:Math.log raises a TypeError if the argument cannot be coerced with Float()
fails:Math.log raises a TypeError for numerical values passed as string
fails:Math.log returns NaN given NaN