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require_relative '../../spec_helper'
describe "Hash" do
it "includes Enumerable" do
Hash.include?(Enumerable).should == true
end
end
describe "Hash#hash" do
it "returns a value which doesn't depend on the hash order" do
{ 0=>2, 11=>1 }.hash.should == { 11=>1, 0=>2 }.hash
end
it "returns a value in which element values do not cancel each other out" do
{ a: 2, b: 2 }.hash.should_not == { a: 7, b: 7 }.hash
end
it "returns a value in which element keys and values do not cancel each other out" do
{ :a => :a }.hash.should_not == { :b => :b }.hash
end
it "generates a hash for recursive hash structures" do
h = {}
h[:a] = h
(h.hash == h[:a].hash).should == true
end
it "returns the same hash for recursive hashes" do
h = {} ; h[:x] = h
h.hash.should == {x: h}.hash
h.hash.should == {x: {x: h}}.hash
# This is because h.eql?(x: h)
# Remember that if two objects are eql?
# then the need to have the same hash.
# Check the Hash#eql? specs!
end
it "returns the same hash for recursive hashes through arrays" do
h = {} ; rec = [h] ; h[:x] = rec
h.hash.should == {x: rec}.hash
h.hash.should == {x: [h]}.hash
# Like above, because h.eql?(x: [h])
end
end
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