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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe 'Enumerable#uniq' do
it 'returns an array that contains only unique elements' do
[0, 1, 2, 3].to_enum.uniq { |n| n.even? }.should == [0, 1]
end
it "uses eql? semantics" do
[1.0, 1].to_enum.uniq.should == [1.0, 1]
end
it "compares elements first with hash" do
x = mock('0')
x.should_receive(:hash).at_least(1).and_return(0)
y = mock('0')
y.should_receive(:hash).at_least(1).and_return(0)
[x, y].to_enum.uniq.should == [x, y]
end
it "does not compare elements with different hash codes via eql?" do
x = mock('0')
x.should_not_receive(:eql?)
y = mock('1')
y.should_not_receive(:eql?)
x.should_receive(:hash).at_least(1).and_return(0)
y.should_receive(:hash).at_least(1).and_return(1)
[x, y].to_enum.uniq.should == [x, y]
end
it "compares elements with matching hash codes with #eql?" do
a = Array.new(2) do
obj = mock('0')
obj.should_receive(:hash).at_least(1).and_return(0)
def obj.eql?(o)
false
end
obj
end
a.uniq.should == a
a = Array.new(2) do
obj = mock('0')
obj.should_receive(:hash).at_least(1).and_return(0)
def obj.eql?(o)
true
end
obj
end
a.to_enum.uniq.size.should == 1
end
context 'when yielded with multiple arguments' do
before :each do
@enum = Object.new.to_enum
class << @enum
def each
yield 0, 'foo'
yield 1, 'FOO'
yield 2, 'bar'
end
end
end
it 'returns all yield arguments as an array' do
@enum.uniq { |_, label| label.downcase }.should == [[0, 'foo'], [2, 'bar']]
end
end
end
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