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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Enumerable#max" 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 "returns the maximum element" do
EnumerableSpecs::Numerous.new.max.should == 6
end
it "returns the maximum element (basics cases)" do
EnumerableSpecs::EachDefiner.new(55).max.should == 55
EnumerableSpecs::EachDefiner.new(11,99).max.should == 99
EnumerableSpecs::EachDefiner.new(99,11).max.should == 99
EnumerableSpecs::EachDefiner.new(2, 33, 4, 11).max.should == 33
EnumerableSpecs::EachDefiner.new(1,2,3,4,5).max.should == 5
EnumerableSpecs::EachDefiner.new(5,4,3,2,1).max.should == 5
EnumerableSpecs::EachDefiner.new(1,4,3,5,2).max.should == 5
EnumerableSpecs::EachDefiner.new(5,5,5,5,5).max.should == 5
EnumerableSpecs::EachDefiner.new("aa","tt").max.should == "tt"
EnumerableSpecs::EachDefiner.new("tt","aa").max.should == "tt"
EnumerableSpecs::EachDefiner.new("2","33","4","11").max.should == "4"
@e_strs.max.should == "666666"
@e_ints.max.should == 1010101010
end
it "returns nil for an empty Enumerable" do
EnumerableSpecs::EachDefiner.new.max.should == nil
end
it "raises a NoMethodError for elements without #<=>" do
lambda do
EnumerableSpecs::EachDefiner.new(BasicObject.new, BasicObject.new).max
end.should raise_error(NoMethodError)
end
it "raises an ArgumentError for incomparable elements" do
lambda do
EnumerableSpecs::EachDefiner.new(11,"22").max
end.should raise_error(ArgumentError)
lambda do
EnumerableSpecs::EachDefiner.new(11,12,22,33).max{|a, b| nil}
end.should raise_error(ArgumentError)
end
context "when passed a block" do
it "returns the maximum element" do
EnumerableSpecs::EachDefiner.new("2","33","4","11").max {|a,b| a <=> b }.should == "4"
EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).max {|a,b| a <=> b }.should == 33
EnumerableSpecs::EachDefiner.new("2","33","4","11").max {|a,b| b <=> a }.should == "11"
EnumerableSpecs::EachDefiner.new( 2 , 33 , 4 , 11 ).max {|a,b| b <=> a }.should == 2
@e_strs.max {|a,b| a.length <=> b.length }.should == "1010101010"
@e_strs.max {|a,b| a <=> b }.should == "666666"
@e_strs.max {|a,b| a.to_i <=> b.to_i }.should == "1010101010"
@e_ints.max {|a,b| a <=> b }.should == 1010101010
@e_ints.max {|a,b| a.to_s <=> b.to_s }.should == 666666
end
end
it "returns the maximum for enumerables that contain nils" do
arr = EnumerableSpecs::Numerous.new(nil, nil, true)
arr.max { |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.max.should == [6, 7, 8, 9]
end
context "when called with an argument n" do
context "without a block" do
it "returns an array containing the maximum n elements" do
result = @e_ints.max(2)
result.should == [1010101010, 666666]
end
end
context "with a block" do
it "returns an array containing the maximum n elements" do
result = @e_ints.max(2) { |a, b| a * 2 <=> b * 2 }
result.should == [1010101010, 666666]
end
end
context "on a enumerable of length x where x < n" do
it "returns an array containing the maximum n elements of length x" do
result = @e_ints.max(500)
result.length.should == 5
end
end
context "that is negative" do
it "raises an ArgumentError" do
lambda { @e_ints.max(-1) }.should raise_error(ArgumentError)
end
end
end
context "that is nil" do
it "returns the maximum element" do
@e_ints.max(nil).should == 1010101010
end
end
end
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