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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#hash" do
it "returns the same fixnum for arrays with the same content" do
[].respond_to?(:hash).should == true
[[], [1, 2, 3]].each do |ary|
ary.hash.should == ary.dup.hash
ary.hash.should be_an_instance_of(Fixnum)
end
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
lambda { empty.hash }.should_not raise_error
array = ArraySpecs.recursive_array
lambda { array.hash }.should_not raise_error
end
it "returns the same hash for equal recursive arrays" do
rec = []; rec << rec
rec.hash.should == [rec].hash
rec.hash.should == [[rec]].hash
# This is because rec.eql?([[rec]])
# Remember that if two objects are eql?
# then the need to have the same hash
# Check the Array#eql? specs!
end
it "returns the same hash for equal recursive arrays through hashes" do
h = {} ; rec = [h] ; h[:x] = rec
rec.hash.should == [h].hash
rec.hash.should == [{x: rec}].hash
# Like above, this is because rec.eql?([{x: rec}])
end
it "calls to_int on result of calling hash on each element" do
ary = Array.new(5) do
obj = mock('0')
obj.should_receive(:hash).and_return(obj)
obj.should_receive(:to_int).and_return(0)
obj
end
ary.hash
hash = mock('1')
hash.should_receive(:to_int).and_return(1.hash)
obj = mock('@hash')
obj.instance_variable_set(:@hash, hash)
def obj.hash() @hash end
[obj].hash.should == [1].hash
end
it "ignores array class differences" do
ArraySpecs::MyArray[].hash.should == [].hash
ArraySpecs::MyArray[1, 2].hash.should == [1, 2].hash
end
it "returns same hash code for arrays with the same content" do
a = [1, 2, 3, 4]
a.fill 'a', 0..3
b = %w|a a a a|
a.hash.should == b.hash
end
it "returns the same value if arrays are #eql?" do
a = [1, 2, 3, 4]
a.fill 'a', 0..3
b = %w|a a a a|
a.hash.should == b.hash
a.should eql(b)
end
it "produces different hashes for nested arrays with different values and empty terminator" do
[1, [1, []]].hash.should_not == [2, [2, []]].hash
end
end
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