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require 'spec_helper'
describe Immutable::Hash do
describe '#clear' do
[
[],
['A' => 'aye'],
['A' => 'aye', 'B' => 'bee', 'C' => 'see'],
].each do |values|
context "on #{values}" do
let(:original) { H[*values] }
let(:result) { original.clear }
it 'preserves the original' do
result
original.should eql(H[*values])
end
it 'returns an empty hash' do
result.should equal(H.empty)
result.should be_empty
end
end
end
it 'maintains the default Proc, if there is one' do
hash = H.new(a: 1) { 1 }
hash.clear[:b].should == 1
hash.clear[:c].should == 1
hash.clear.default_proc.should_not be_nil
end
context 'on a subclass' do
it 'returns an empty instance of the subclass' do
subclass = Class.new(Immutable::Hash)
instance = subclass.new(a: 1, b: 2)
instance.clear.class.should be(subclass)
instance.clear.should be_empty
end
end
end
end
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