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require_relative '../../spec_helper'
describe "Queue#initialize" do
it "can be passed no arguments for an empty Queue" do
q = Queue.new
q.size.should == 0
q.should.empty?
end
ruby_version_is '3.1' do
it "adds all elements of the passed Enumerable to self" do
q = Queue.new([1, 2, 3])
q.size.should == 3
q.should_not.empty?
q.pop.should == 1
q.pop.should == 2
q.pop.should == 3
q.should.empty?
end
it "uses #to_a on the provided Enumerable" do
enumerable = MockObject.new('mock-enumerable')
enumerable.should_receive(:to_a).and_return([1, 2, 3])
q = Queue.new(enumerable)
q.size.should == 3
q.should_not.empty?
q.pop.should == 1
q.pop.should == 2
q.pop.should == 3
q.should.empty?
end
it "raises if the provided Enumerable does not respond to #to_a" do
enumerable = MockObject.new('mock-enumerable')
-> { Queue.new(enumerable) }.should raise_error(TypeError, "can't convert MockObject into Array")
end
end
end
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