require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Enumerable#minmax" do before :each do @enum = EnumerableSpecs::Numerous.new(6, 4, 5, 10, 8) @strs = EnumerableSpecs::Numerous.new("333", "2", "60", "55555", "1010", "111") end it "min should return the minimum element" do @enum.minmax.should == [4, 10] @strs.minmax.should == ["1010", "60" ] end it "returns [nil, nil] for an empty Enumerable" do EnumerableSpecs::Empty.new.minmax.should == [nil, nil] end it "raises an ArgumentError when elements are incomparable" do lambda do EnumerableSpecs::Numerous.new(11,"22").minmax end.should raise_error(ArgumentError) lambda do EnumerableSpecs::Numerous.new(11,12,22,33).minmax{|a, b| nil} end.should raise_error(ArgumentError) end it "raises a NoMethodError for elements without #<=>" do lambda do EnumerableSpecs::Numerous.new(BasicObject.new, BasicObject.new).minmax end.should raise_error(NoMethodError) end it "returns the minimum when using a block rule" do @enum.minmax {|a,b| b <=> a }.should == [10, 4] @strs.minmax {|a,b| a.length <=> b.length }.should == ["2", "55555"] end it "gathers whole arrays as elements when each yields multiple" do multi = EnumerableSpecs::YieldsMulti.new multi.minmax.should == [[1, 2], [6, 7, 8, 9]] end end