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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#shuffle" do
ruby_version_is "1.8.7" do
it "returns the same values, in a usually different order" do
a = [1, 2, 3, 4]
different = false
10.times do
s = a.shuffle
s.sort.should == a
different ||= (a != s)
end
different.should be_true # Will fail once in a blue moon (4!^10)
end
it "is not destructive" do
a = [1, 2, 3]
10.times do
a.shuffle
a.should == [1, 2, 3]
end
end
end
ruby_version_is "1.8.7" ... "1.9.3" do
it "returns subclass instances with Array subclass" do
ArraySpecs::MyArray[1, 2, 3].shuffle.should be_an_instance_of(ArraySpecs::MyArray)
end
end
ruby_version_is "1.9.3" do
it "does not return subclass instances with Array subclass" do
ArraySpecs::MyArray[1, 2, 3].shuffle.should be_an_instance_of(Array)
end
end
ruby_version_is "1.9.3" do
it "attempts coercion via #to_hash" do
obj = mock('hash')
obj.should_receive(:to_hash).once.and_return({})
[2, 3].shuffle(obj)
end
it "uses default random generator" do
Kernel.should_receive(:rand).exactly(2).and_return(1, 0)
[2, 3].shuffle(:random => Object.new).should == [3, 2]
end
it "uses given random generator" do
random = Random.new
random.should_receive(:rand).exactly(2).and_return(1, 0)
[2, 3].shuffle(:random => random).should == [3, 2]
end
end
end
describe "Array#shuffle!" do
ruby_version_is "1.8.7" do
it "returns the same values, in a usually different order" do
a = [1, 2, 3, 4]
original = a
different = false
10.times do
a = a.shuffle!
a.sort.should == [1, 2, 3, 4]
different ||= (a != [1, 2, 3, 4])
end
different.should be_true # Will fail once in a blue moon (4!^10)
a.should equal(original)
end
ruby_version_is ""..."1.9" do
it "raises a TypeError on a frozen array" do
lambda { ArraySpecs.frozen_array.shuffle! }.should raise_error(TypeError)
lambda { ArraySpecs.empty_frozen_array.shuffle! }.should raise_error(TypeError)
end
end
ruby_version_is "1.9" do
it "raises a RuntimeError on a frozen array" do
lambda { ArraySpecs.frozen_array.shuffle! }.should raise_error(RuntimeError)
lambda { ArraySpecs.empty_frozen_array.shuffle! }.should raise_error(RuntimeError)
end
end
end
end
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