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require 'spec_helper'
describe Immutable::Hash do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
describe '#flat_map' do
it 'yields each key/val pair' do
passed = []
hash.flat_map { |pair| passed << pair }
passed.sort.should == [['A', 'aye'], ['B', 'bee'], ['C', 'see']]
end
it 'returns the concatenation of block return values' do
hash.flat_map { |k,v| [k,v] }.sort.should == ['A', 'B', 'C', 'aye', 'bee', 'see']
hash.flat_map { |k,v| L[k,v] }.sort.should == ['A', 'B', 'C', 'aye', 'bee', 'see']
hash.flat_map { |k,v| V[k,v] }.sort.should == ['A', 'B', 'C', 'aye', 'bee', 'see']
end
it "doesn't change the receiver" do
hash.flat_map { |k,v| [k,v] }
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
context 'with no block' do
it 'returns an Enumerator' do
hash.flat_map.class.should be(Enumerator)
hash.flat_map.each { |k,v| [k] }.sort.should == ['A', 'B', 'C']
end
end
it 'returns an empty array if only empty arrays are returned by block' do
hash.flat_map { [] }.should eql([])
end
end
end
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