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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#uniq" do
it "returns an array with no duplicates" do
["a", "a", "b", "b", "c"].uniq.should == ["a", "b", "c"]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.uniq.should == [empty]
array = ArraySpecs.recursive_array
array.uniq.should == [1, 'two', 3.0, array]
end
it "uses eql? semantics" do
[1.0, 1].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].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].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)
# It's undefined whether the impl does a[0].eql?(a[1]) or
# a[1].eql?(a[0]) so we taint both.
taint
o.taint
false
end
obj
end
a.uniq.should == a
a[0].tainted?.should == true
a[1].tainted?.should == true
a = Array.new(2) do
obj = mock('0')
obj.should_receive(:hash).at_least(1).and_return(0)
def obj.eql?(o)
# It's undefined whether the impl does a[0].eql?(a[1]) or
# a[1].eql?(a[0]) so we taint both.
taint
o.taint
true
end
obj
end
a.uniq.size.should == 1
a[0].tainted?.should == true
a[1].tainted?.should == true
end
it "compares elements based on the value returned from the block" do
a = [1, 2, 3, 4]
a.uniq { |x| x >= 2 ? 1 : 0 }.should == [1, 2]
end
it "yields items in order" do
a = [1, 2, 3]
yielded = []
a.uniq { |v| yielded << v }
yielded.should == a
end
it "handles nil and false like any other values" do
[nil, false, 42].uniq { :foo }.should == [nil]
[false, nil, 42].uniq { :bar }.should == [false]
end
it "returns subclass instance on Array subclasses" do
ArraySpecs::MyArray[1, 2, 3].uniq.should be_an_instance_of(ArraySpecs::MyArray)
end
it "properly handles an identical item even when its #eql? isn't reflexive" do
x = mock('x')
x.should_receive(:hash).at_least(1).and_return(42)
x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
[x, x].uniq.should == [x]
end
describe "given an array of BasicObject subclasses that define ==, eql?, and hash" do
# jruby/jruby#3227
it "filters equivalent elements using those definitions" do
basic = Class.new(BasicObject) do
attr_reader :x
def initialize(x)
@x = x
end
def ==(rhs)
@x == rhs.x
end
alias_method :eql?, :==
def hash
@x.hash
end
end
a = [basic.new(3), basic.new(2), basic.new(1), basic.new(4), basic.new(1), basic.new(2), basic.new(3)]
a.uniq.should == [basic.new(3), basic.new(2), basic.new(1), basic.new(4)]
end
end
end
describe "Array#uniq!" do
it "modifies the array in place" do
a = [ "a", "a", "b", "b", "c" ]
a.uniq!
a.should == ["a", "b", "c"]
end
it "returns self" do
a = [ "a", "a", "b", "b", "c" ]
a.should equal(a.uniq!)
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty_dup = empty.dup
empty.uniq!
empty.should == empty_dup
array = ArraySpecs.recursive_array
expected = array[0..3]
array.uniq!
array.should == expected
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)
a = [x, y]
a.uniq!
a.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)
a = [x, y]
a.uniq!
a.should == [x, y]
end
it "returns nil if no changes are made to the array" do
[ "a", "b", "c" ].uniq!.should == nil
end
it "raises a RuntimeError on a frozen array when the array is modified" do
dup_ary = [1, 1, 2]
dup_ary.freeze
lambda { dup_ary.uniq! }.should raise_error(RuntimeError)
end
# see [ruby-core:23666]
it "raises a RuntimeError on a frozen array when the array would not be modified" do
lambda { ArraySpecs.frozen_array.uniq!}.should raise_error(RuntimeError)
lambda { ArraySpecs.empty_frozen_array.uniq!}.should raise_error(RuntimeError)
end
it "doesn't yield to the block on a frozen array" do
lambda { ArraySpecs.frozen_array.uniq!{ raise RangeError, "shouldn't yield"}}.should raise_error(RuntimeError)
end
it "compares elements based on the value returned from the block" do
a = [1, 2, 3, 4]
a.uniq! { |x| x >= 2 ? 1 : 0 }.should == [1, 2]
end
it "properly handles an identical item even when its #eql? isn't reflexive" do
x = mock('x')
x.should_receive(:hash).at_least(1).and_return(42)
x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
a = [x, x]
a.uniq!
a.should == [x]
end
end
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