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require 'spec_helper'
describe Immutable::Vector do
describe '#rindex' do
let(:vector) { V[1,2,3,3,2,1] }
context 'when passed an object present in the vector' do
it 'returns the last index where the object is present' do
vector.rindex(1).should be(5)
vector.rindex(2).should be(4)
vector.rindex(3).should be(3)
end
end
context 'when passed an object not present in the vector' do
it 'returns nil' do
vector.rindex(0).should be_nil
vector.rindex(nil).should be_nil
vector.rindex('string').should be_nil
end
end
context 'with a block' do
it 'returns the last index of an object which the predicate is true for' do
vector.rindex { |n| n > 2 }.should be(3)
end
end
context 'without an argument OR block' do
it 'returns an Enumerator' do
vector.rindex.class.should be(Enumerator)
vector.rindex.each { |n| n > 2 }.should be(3)
end
end
end
end
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