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119 lines
3.9 KiB
Ruby
119 lines
3.9 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "Enumerable#max" do
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before :each do
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@e_strs = EnumerableSpecs::EachDefiner.new("333", "22", "666666", "1", "55555", "1010101010")
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@e_ints = EnumerableSpecs::EachDefiner.new( 333, 22, 666666, 55555, 1010101010)
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end
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it "returns the maximum element" do
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EnumerableSpecs::Numerous.new.max.should == 6
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end
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it "returns the maximum element (basics cases)" do
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EnumerableSpecs::EachDefiner.new(55).max.should == 55
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EnumerableSpecs::EachDefiner.new(11,99).max.should == 99
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EnumerableSpecs::EachDefiner.new(99,11).max.should == 99
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EnumerableSpecs::EachDefiner.new(2, 33, 4, 11).max.should == 33
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EnumerableSpecs::EachDefiner.new(1,2,3,4,5).max.should == 5
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EnumerableSpecs::EachDefiner.new(5,4,3,2,1).max.should == 5
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EnumerableSpecs::EachDefiner.new(1,4,3,5,2).max.should == 5
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EnumerableSpecs::EachDefiner.new(5,5,5,5,5).max.should == 5
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EnumerableSpecs::EachDefiner.new("aa","tt").max.should == "tt"
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EnumerableSpecs::EachDefiner.new("tt","aa").max.should == "tt"
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EnumerableSpecs::EachDefiner.new("2","33","4","11").max.should == "4"
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@e_strs.max.should == "666666"
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@e_ints.max.should == 1010101010
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end
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it "returns nil for an empty Enumerable" do
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EnumerableSpecs::EachDefiner.new.max.should == nil
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end
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it "raises a NoMethodError for elements without #<=>" do
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-> do
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EnumerableSpecs::EachDefiner.new(BasicObject.new, BasicObject.new).max
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end.should raise_error(NoMethodError)
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end
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it "raises an ArgumentError for incomparable elements" do
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-> do
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EnumerableSpecs::EachDefiner.new(11,"22").max
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end.should raise_error(ArgumentError)
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-> do
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EnumerableSpecs::EachDefiner.new(11,12,22,33).max{|a, b| nil}
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end.should raise_error(ArgumentError)
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end
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context "when passed a block" do
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it "returns the maximum element" do
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EnumerableSpecs::EachDefiner.new("2","33","4","11").max {|a,b| a <=> b }.should == "4"
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EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).max {|a,b| a <=> b }.should == 33
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EnumerableSpecs::EachDefiner.new("2","33","4","11").max {|a,b| b <=> a }.should == "11"
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EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).max {|a,b| b <=> a }.should == 2
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@e_strs.max {|a,b| a.length <=> b.length }.should == "1010101010"
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@e_strs.max {|a,b| a <=> b }.should == "666666"
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@e_strs.max {|a,b| a.to_i <=> b.to_i }.should == "1010101010"
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@e_ints.max {|a,b| a <=> b }.should == 1010101010
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@e_ints.max {|a,b| a.to_s <=> b.to_s }.should == 666666
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end
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end
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it "returns the maximum for enumerables that contain nils" do
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arr = EnumerableSpecs::Numerous.new(nil, nil, true)
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arr.max { |a, b|
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x = a.nil? ? 1 : a ? 0 : -1
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y = b.nil? ? 1 : b ? 0 : -1
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x <=> y
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}.should == nil
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end
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it "gathers whole arrays as elements when each yields multiple" do
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multi = EnumerableSpecs::YieldsMulti.new
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multi.max.should == [6, 7, 8, 9]
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end
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context "when called with an argument n" do
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context "without a block" do
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it "returns an array containing the maximum n elements" do
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result = @e_ints.max(2)
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result.should == [1010101010, 666666]
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end
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end
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context "with a block" do
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it "returns an array containing the maximum n elements" do
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result = @e_ints.max(2) { |a, b| a * 2 <=> b * 2 }
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result.should == [1010101010, 666666]
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end
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end
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context "on a enumerable of length x where x < n" do
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it "returns an array containing the maximum n elements of length x" do
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result = @e_ints.max(500)
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result.length.should == 5
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end
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end
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context "that is negative" do
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it "raises an ArgumentError" do
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-> { @e_ints.max(-1) }.should raise_error(ArgumentError)
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end
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end
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end
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context "that is nil" do
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it "returns the maximum element" do
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@e_ints.max(nil).should == 1010101010
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end
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end
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end
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