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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#unshift" do
it "prepends object to the original array" do
a = [1, 2, 3]
a.unshift("a").should equal(a)
a.should == ['a', 1, 2, 3]
a.unshift().should equal(a)
a.should == ['a', 1, 2, 3]
a.unshift(5, 4, 3)
a.should == [5, 4, 3, 'a', 1, 2, 3]
# shift all but one element
a = [1, 2]
a.shift
a.unshift(3, 4)
a.should == [3, 4, 2]
# now shift all elements
a.shift
a.shift
a.shift
a.unshift(3, 4)
a.should == [3, 4]
end
it "quietly ignores unshifting nothing" do
[].unshift().should == []
[].unshift(*[]).should == []
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.unshift(:new).should == [:new, empty]
array = ArraySpecs.recursive_array
array.unshift(:new)
array[0..5].should == [:new, 1, 'two', 3.0, array, array]
end
ruby_version_is "" ... "1.9" do
it "raises a TypeError on a frozen array" do
lambda { ArraySpecs.frozen_array.unshift(1) }.should raise_error(TypeError)
end
end
ruby_version_is "1.9" do
it "raises a RuntimeError on a frozen array when the array is modified" do
lambda { ArraySpecs.frozen_array.unshift(1) }.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.unshift }.should raise_error(RuntimeError)
end
end
ruby_version_is ""..."1.9" do
it "does not raise an exception on a frozen array if no modification takes place" do
ArraySpecs.frozen_array.unshift.should == [1, 2, 3]
end
end
end
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