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require 'spec_helper'
describe Immutable::Hash do
let(:hash) { H.new('A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL') }
describe '#slice' do
let(:slice) { hash.slice(*values) }
context 'with all keys present in the Hash' do
let(:values) { ['B', nil] }
it 'returns the sliced values' do
expect(slice).to eq(described_class.new('B' => 'bee', nil => 'NIL'))
end
it "doesn't modify the original Hash" do
slice
hash.should eql(H.new('A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'))
end
end
context "with keys aren't present in the Hash" do
let(:values) { ['B', 'A', 3] }
it 'returns the sliced values of the matching keys' do
expect(slice).to eq(described_class.new('A' => 'aye', 'B' => 'bee'))
end
it "doesn't modify the original Hash" do
slice
hash.should eql(H.new('A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'))
end
end
context 'on a Hash with a default block' do
let(:hash) { H.new('A' => 'aye', 'B' => 'bee') { 'nothing' }}
let(:values) { ['B', nil] }
it 'maintains the default block' do
expect(slice['C']).to eq('nothing')
end
end
end
end
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