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require 'spec_helper'
require 'immutable/hash'
describe Immutable::Hash do
describe '#dig' do
let(:h) { H[:a => 9, :b => H[:c => 'a', :d => 4], :e => nil] }
it 'returns the value with one argument to dig' do
expect(h.dig(:a)).to eq(9)
end
it 'returns the value in nested hashes' do
expect(h.dig(:b, :c)).to eq('a')
end
it 'returns nil if the key is not present' do
expect(h.dig(:f, :foo)).to eq(nil)
end
it 'returns nil if you dig out the end of the hash' do
expect(h.dig(:f, :foo, :bar)).to eq(nil)
end
# This is a bit different from Ruby's Hash; it raises TypeError for
# objects which don't respond to #dig
it 'raises a NoMethodError if a value does not support #dig' do
expect { h.dig(:a, :foo) }.to raise_error(NoMethodError)
end
it 'returns the correct value when there is a default proc' do
default_hash = H.new { |k, v| "#{k}-default" }
expect(default_hash.dig(:a)).to eq('a-default')
end
end
end
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