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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
describe "Array#sort_by!" do
it "sorts array in place by passing each element to the given block" do
a = [-100, -2, 1, 200, 30000]
a.sort_by!{ |e| e.to_s.size }
a.should == [1, -2, 200, -100, 30000]
end
it "returns an Enumerator if not given a block" do
(1..10).to_a.sort_by!.should be_an_instance_of(Enumerator)
end
it "completes when supplied a block that always returns the same result" do
a = [2, 3, 5, 1, 4]
a.sort_by!{ 1 }
a.should be_an_instance_of(Array)
a.sort_by!{ 0 }
a.should be_an_instance_of(Array)
a.sort_by!{ -1 }
a.should be_an_instance_of(Array)
end
it "raises a RuntimeError on a frozen array" do
lambda { ArraySpecs.frozen_array.sort_by! {}}.should raise_error(RuntimeError)
end
it "raises a RuntimeError on an empty frozen array" do
lambda { ArraySpecs.empty_frozen_array.sort_by! {}}.should raise_error(RuntimeError)
end
it "returns the specified value when it would break in the given block" do
[1, 2, 3].sort_by!{ break :a }.should == :a
end
it "makes some modification even if finished sorting when it would break in the given block" do
partially_sorted = (1..5).map{|i|
ary = [5, 4, 3, 2, 1]
ary.sort_by!{|x,y| break if x==i; x<=>y}
ary
}
partially_sorted.any?{|ary| ary != [1, 2, 3, 4, 5]}.should be_true
end
it "changes nothing when called on a single element array" do
[1].sort_by!(&:to_s).should == [1]
end
it_behaves_like :enumeratorized_with_origin_size, :sort_by!, [1,2,3]
end
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