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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#shuffle" 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
it "does not return subclass instances with Array subclass" do
ArraySpecs::MyArray[1, 2, 3].shuffle.should be_an_instance_of(Array)
end
it "attempts coercion via #to_hash" do
obj = mock('hash')
obj.should_receive(:to_hash).once.and_return({})
[2, 3].shuffle(obj)
end
it "calls #rand on the Object passed by the :random key in the arguments Hash" do
obj = mock("array_shuffle_random")
obj.should_receive(:rand).at_least(1).times.and_return(0.5)
result = [1, 2].shuffle(random: obj)
result.size.should == 2
result.should include(1, 2)
end
it "raises a NoMethodError if an object passed for the RNG does not define #rand" do
obj = BasicObject.new
lambda { [1, 2].shuffle(random: obj) }.should raise_error(NoMethodError)
end
it "accepts a Float for the value returned by #rand" do
random = mock("array_shuffle_random")
random.should_receive(:rand).at_least(1).times.and_return(0.3)
[1, 2].shuffle(random: random).should be_an_instance_of(Array)
end
it "calls #to_int on the Object returned by #rand" do
value = mock("array_shuffle_random_value")
value.should_receive(:to_int).at_least(1).times.and_return(0)
random = mock("array_shuffle_random")
random.should_receive(:rand).at_least(1).times.and_return(value)
[1, 2].shuffle(random: random).should be_an_instance_of(Array)
end
it "raises a RangeError if the value is less than zero" do
value = mock("array_shuffle_random_value")
value.should_receive(:to_int).and_return(-1)
random = mock("array_shuffle_random")
random.should_receive(:rand).and_return(value)
lambda { [1, 2].shuffle(random: random) }.should raise_error(RangeError)
end
it "raises a RangeError if the value is equal to one" do
value = mock("array_shuffle_random_value")
value.should_receive(:to_int).at_least(1).times.and_return(1)
random = mock("array_shuffle_random")
random.should_receive(:rand).at_least(1).times.and_return(value)
lambda { [1, 2].shuffle(random: random) }.should raise_error(RangeError)
end
end
describe "Array#shuffle!" 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
it "raises a #{frozen_error_class} on a frozen array" do
lambda { ArraySpecs.frozen_array.shuffle! }.should raise_error(frozen_error_class)
lambda { ArraySpecs.empty_frozen_array.shuffle! }.should raise_error(frozen_error_class)
end
end
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