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require 'spec_helper'
describe Immutable::Hash do
[:get, :[]].each do |method|
describe "##{method}" do
context 'with a default block' do
let(:hash) { H.new('A' => 'aye') { |key| fail }}
context 'when the key exists' do
it 'returns the value associated with the key' do
hash.send(method, 'A').should == 'aye'
end
it "does not call the default block even if the key is 'nil'" do
H.new(nil => 'something') { fail }.send(method, nil)
end
end
context 'when the key does not exist' do
let(:hash) do
H.new('A' => 'aye') do |key|
expect(key).to eq('B')
'bee'
end
end
it 'returns the value from the default block' do
hash.send(method, 'B').should == 'bee'
end
end
end
context 'with no default block' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'] }
[
%w[A aye],
%w[B bee],
%w[C see],
[nil, 'NIL']
].each do |key, value|
it "returns the value (#{value.inspect}) for an existing key (#{key.inspect})" do
hash.send(method, key).should == value
end
end
it 'returns nil for a non-existing key' do
hash.send(method, 'D').should be_nil
end
end
it 'uses #hash to look up keys' do
x = double('0')
x.should_receive(:hash).and_return(0)
H[foo: :bar].send(method, x).should be_nil
end
it 'uses #eql? to compare keys with the same hash code' do
x = double('x', hash: 42)
x.should_not_receive(:eql?)
y = double('y', hash: 42)
y.should_receive(:eql?).and_return(true)
H[y => 1][x].should == 1
end
it 'does not use #eql? to compare keys with different hash codes' do
x = double('x', hash: 0)
x.should_not_receive(:eql?)
y = double('y', hash: 1)
y.should_not_receive(:eql?)
H[y => 1][x].should be_nil
end
end
end
end
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