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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/enumerable_enumeratorized'
describe "Enumerable#sort_by" do
it "returns an array of elements ordered by the result of block" do
a = EnumerableSpecs::Numerous.new("once", "upon", "a", "time")
a.sort_by { |i| i[0] }.should == ["a", "once", "time", "upon"]
end
it "sorts the object by the given attribute" do
a = EnumerableSpecs::SortByDummy.new("fooo")
b = EnumerableSpecs::SortByDummy.new("bar")
ar = [a, b].sort_by { |d| d.s }
ar.should == [b, a]
end
it "returns an Enumerator when a block is not supplied" do
a = EnumerableSpecs::Numerous.new("a","b")
a.sort_by.should be_an_instance_of(Enumerator)
a.to_a.should == ["a", "b"]
end
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
multi.sort_by {|e| e.size}.should == [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
end
it "returns an array of elements when a block is supplied and #map returns an enumerable" do
b = EnumerableSpecs::MapReturnsEnumerable.new
b.sort_by{ |x| -x }.should == [3, 2, 1]
end
it "calls #each to iterate over the elements to be sorted" do
b = EnumerableSpecs::Numerous.new( 1, 2, 3 )
b.should_receive(:each).once.and_yield(1).and_yield(2).and_yield(3)
b.should_not_receive :map
b.sort_by { |x| -x }.should == [3, 2, 1]
end
it_behaves_like :enumerable_enumeratorized_with_origin_size, :sort_by
end
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