fails:Enumerable#one? when passed a block returns true if block returns true once
fails:Enumerable#one? when passed a block returns false if the block returns true more than once
fails:Enumerable#one? when passed a block returns false if the block only returns false
fails:Enumerable#one? when passed a block gathers initial args as elements when each yields multiple
fails:Enumerable#one? when passed a block yields multiple arguments when each yields multiple
fails:Enumerable#one? when not passed a block returns true if only one element evaluates to true
fails:Enumerable#one? when not passed a block returns false if two elements evaluate to true
fails:Enumerable#one? when not passed a block returns false if all elements evaluate to false
fails:Enumerable#one? when not passed a block gathers whole arrays as elements when each yields multiple
