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116 lines
2.9 KiB
Ruby
116 lines
2.9 KiB
Ruby
require_relative '../../spec_helper'
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describe "Array#max" do
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it "is defined on Array" do
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[1].method(:max).owner.should equal Array
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end
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it "returns nil with no values" do
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[].max.should == nil
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end
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it "returns only element in one element array" do
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[1].max.should == 1
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end
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it "returns largest value with multiple elements" do
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[1,2].max.should == 2
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[2,1].max.should == 2
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end
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describe "given a block with one argument" do
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it "yields in turn the last length-1 values from the array" do
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ary = []
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result = [1,2,3,4,5].max {|x| ary << x; x}
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ary.should == [2,3,4,5]
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result.should == 5
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end
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end
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end
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# From Enumerable#max, copied for better readability
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describe "Array#max" do
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before :each do
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@a = [2, 4, 6, 8, 10]
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@e_strs = ["333", "22", "666666", "1", "55555", "1010101010"]
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@e_ints = [333, 22, 666666, 55555, 1010101010]
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end
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it "max should return the maximum element" do
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[18, 42].max.should == 42
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[2, 5, 3, 6, 1, 4].max.should == 6
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end
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it "returns the maximum element (basics cases)" do
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[55].max.should == 55
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[11,99].max.should == 99
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[99,11].max.should == 99
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[2, 33, 4, 11].max.should == 33
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[1,2,3,4,5].max.should == 5
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[5,4,3,2,1].max.should == 5
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[1,4,3,5,2].max.should == 5
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[5,5,5,5,5].max.should == 5
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["aa","tt"].max.should == "tt"
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["tt","aa"].max.should == "tt"
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["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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[].max.should == nil
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end
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it "raises a NoMethodError for elements without #<=>" do
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lambda do
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[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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lambda do
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[11,"22"].max
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end.should raise_error(ArgumentError)
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lambda do
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[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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it "returns the maximum element (with block)" do
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# with a block
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["2","33","4","11"].max {|a,b| a <=> b }.should == "4"
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[ 2 , 33 , 4 , 11 ].max {|a,b| a <=> b }.should == 33
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["2","33","4","11"].max {|a,b| b <=> a }.should == "11"
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[ 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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it "returns the minimum for enumerables that contain nils" do
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arr = [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 = [[1,2], [3,4,5], [6,7,8,9]]
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multi.max.should == [6, 7, 8, 9]
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end
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end
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