require_relative '../../spec_helper' require_relative 'fixtures/classes' require_relative '../enumerable/shared/enumeratorized' # Modifying a collection while the contents are being iterated # gives undefined behavior. See # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/23633 describe "Array#rindex" do it "returns the first index backwards from the end where element == to object" do key = 3 uno = mock('one') dos = mock('two') tres = mock('three') tres.should_receive(:==).any_number_of_times.and_return(false) dos.should_receive(:==).any_number_of_times.and_return(true) uno.should_not_receive(:==) ary = [uno, dos, tres] ary.rindex(key).should == 1 end it "returns size-1 if last element == to object" do [2, 1, 3, 2, 5].rindex(5).should == 4 end it "returns 0 if only first element == to object" do [2, 1, 3, 1, 5].rindex(2).should == 0 end it "returns nil if no element == to object" do [1, 1, 3, 2, 1, 3].rindex(4).should == nil end it "returns correct index even after delete_at" do array = ["fish", "bird", "lion", "cat"] array.delete_at(0) array.rindex("lion").should == 1 end it "properly handles empty recursive arrays" do empty = ArraySpecs.empty_recursive_array empty.rindex(empty).should == 0 empty.rindex(1).should be_nil end it "properly handles recursive arrays" do array = ArraySpecs.recursive_array array.rindex(1).should == 0 array.rindex(array).should == 7 end it "accepts a block instead of an argument" do [4, 2, 1, 5, 1, 3].rindex { |x| x < 2 }.should == 4 end it "ignores the block if there is an argument" do -> { [4, 2, 1, 5, 1, 3].rindex(5) { |x| x < 2 }.should == 3 }.should complain(/given block not used/) end it "rechecks the array size during iteration" do ary = [4, 2, 1, 5, 1, 3] seen = [] ary.rindex { |x| seen << x; ary.clear; false } seen.should == [3] end describe "given no argument and no block" do it "produces an Enumerator" do enum = [4, 2, 1, 5, 1, 3].rindex enum.should be_an_instance_of(Enumerator) enum.each { |x| x < 2 }.should == 4 end end it_behaves_like :enumeratorized_with_unknown_size, :bsearch, [1,2,3] end