require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Enumerable#min" do before :each do @e_strs = EnumerableSpecs::EachDefiner.new("333", "22", "666666", "1", "55555", "1010101010") @e_ints = EnumerableSpecs::EachDefiner.new( 333, 22, 666666, 55555, 1010101010) end it "min should return the minimum element" do EnumerableSpecs::Numerous.new.min.should == 1 end it "returns the minimum (basic cases)" do EnumerableSpecs::EachDefiner.new(55).min.should == 55 EnumerableSpecs::EachDefiner.new(11,99).min.should == 11 EnumerableSpecs::EachDefiner.new(99,11).min.should == 11 EnumerableSpecs::EachDefiner.new(2, 33, 4, 11).min.should == 2 EnumerableSpecs::EachDefiner.new(1,2,3,4,5).min.should == 1 EnumerableSpecs::EachDefiner.new(5,4,3,2,1).min.should == 1 EnumerableSpecs::EachDefiner.new(4,1,3,5,2).min.should == 1 EnumerableSpecs::EachDefiner.new(5,5,5,5,5).min.should == 5 EnumerableSpecs::EachDefiner.new("aa","tt").min.should == "aa" EnumerableSpecs::EachDefiner.new("tt","aa").min.should == "aa" EnumerableSpecs::EachDefiner.new("2","33","4","11").min.should == "11" @e_strs.min.should == "1" @e_ints.min.should == 22 end it "returns nil for an empty Enumerable" do EnumerableSpecs::EachDefiner.new.min.should be_nil end it "raises a NoMethodError for elements without #<=>" do lambda do EnumerableSpecs::EachDefiner.new(BasicObject.new, BasicObject.new).min end.should raise_error(NoMethodError) end it "raises an ArgumentError for incomparable elements" do lambda do EnumerableSpecs::EachDefiner.new(11,"22").min end.should raise_error(ArgumentError) lambda do EnumerableSpecs::EachDefiner.new(11,12,22,33).min{|a, b| nil} end.should raise_error(ArgumentError) end it "returns the minimum when using a block rule" do EnumerableSpecs::EachDefiner.new("2","33","4","11").min {|a,b| a <=> b }.should == "11" EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).min {|a,b| a <=> b }.should == 2 EnumerableSpecs::EachDefiner.new("2","33","4","11").min {|a,b| b <=> a }.should == "4" EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).min {|a,b| b <=> a }.should == 33 EnumerableSpecs::EachDefiner.new( 1, 2, 3, 4 ).min {|a,b| 15 }.should == 1 EnumerableSpecs::EachDefiner.new(11,12,22,33).min{|a, b| 2 }.should == 11 @i = -2 EnumerableSpecs::EachDefiner.new(11,12,22,33).min{|a, b| @i += 1 }.should == 12 @e_strs.min {|a,b| a.length <=> b.length }.should == "1" @e_strs.min {|a,b| a <=> b }.should == "1" @e_strs.min {|a,b| a.to_i <=> b.to_i }.should == "1" @e_ints.min {|a,b| a <=> b }.should == 22 @e_ints.min {|a,b| a.to_s <=> b.to_s }.should == 1010101010 end it "returns the minimum for enumerables that contain nils" do arr = EnumerableSpecs::Numerous.new(nil, nil, true) arr.min { |a, b| x = a.nil? ? -1 : a ? 0 : 1 y = b.nil? ? -1 : b ? 0 : 1 x <=> y }.should == nil end it "gathers whole arrays as elements when each yields multiple" do multi = EnumerableSpecs::YieldsMulti.new multi.min.should == [1, 2] end context "when called with an argument n" do context "without a block" do it "returns an array containing the minimum n elements" do result = @e_ints.min(2) result.should == [22, 333] end end context "with a block" do it "returns an array containing the minimum n elements" do result = @e_ints.min(2) { |a, b| a * 2 <=> b * 2 } result.should == [22, 333] end end context "on a enumerable of length x where x < n" do it "returns an array containing the minimum n elements of length x" do result = @e_ints.min(500) result.length.should == 5 end end context "that is negative" do it "raises an ArgumentError" do lambda { @e_ints.min(-1) }.should raise_error(ArgumentError) end end end context "that is nil" do it "returns the minimum element" do @e_ints.min(nil).should == 22 end end end