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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#delete_at" do
it "removes the element at the specified index" do
a = [1, 2, 3, 4]
a.delete_at(2)
a.should == [1, 2, 4]
a.delete_at(-1)
a.should == [1, 2]
end
it "returns the removed element at the specified index" do
a = [1, 2, 3, 4]
a.delete_at(2).should == 3
a.delete_at(-1).should == 4
end
it "returns nil and makes no modification if the index is out of range" do
a = [1, 2]
a.delete_at(3).should == nil
a.should == [1, 2]
a.delete_at(-3).should == nil
a.should == [1, 2]
end
it "tries to convert the passed argument to an Integer using #to_int" do
obj = mock('to_int')
obj.should_receive(:to_int).and_return(-1)
[1, 2].delete_at(obj).should == 2
end
it "accepts negative indices" do
a = [1, 2]
a.delete_at(-2).should == 1
end
it "raises a RuntimeError on a frozen array" do
lambda { [1,2,3].freeze.delete_at(0) }.should raise_error(RuntimeError)
end
it "keeps tainted status" do
ary = [1, 2]
ary.taint
ary.tainted?.should be_true
ary.delete_at(0)
ary.tainted?.should be_true
ary.delete_at(0) # now empty
ary.tainted?.should be_true
end
it "keeps untrusted status" do
ary = [1, 2]
ary.untrust
ary.untrusted?.should be_true
ary.delete_at(0)
ary.untrusted?.should be_true
ary.delete_at(0) # now empty
ary.untrusted?.should be_true
end
end
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