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require File.dirname(__FILE__) + '/../../spec_helper'
require File.dirname(__FILE__) + '/fixtures/classes'
describe "Array#at" do
it "returns the (n+1)'th element for the passed index n" do
a = [1, 2, 3, 4, 5, 6]
a.at(0).should == 1
a.at(1).should == 2
a.at(5).should == 6
end
it "returns nil if the given index is greater than or equal to the array's length" do
a = [1, 2, 3, 4, 5, 6]
a.at(6).should == nil
a.at(7).should == nil
end
it "returns the (-n)'th elemet from the last, for the given negative index n" do
a = [1, 2, 3, 4, 5, 6]
a.at(-1).should == 6
a.at(-2).should == 5
a.at(-6).should == 1
end
it "returns nil if the given index is less than -len, where len is length of the array" do
a = [1, 2, 3, 4, 5, 6]
a.at(-7).should == nil
a.at(-8).should == nil
end
it "does not extend the array unless the given index is out of range" do
a = [1, 2, 3, 4, 5, 6]
a.length.should == 6
a.at(100)
a.length.should == 6
a.at(-100)
a.length.should == 6
end
it "tries to convert the passed argument to an Integer using #to_int" do
a = ["a", "b", "c"]
a.at(0.5).should == "a"
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
a.at(obj).should == "c"
end
it "raises a TypeError when the passed argument can't be coerced to Integer" do
lambda { [].at("cat") }.should raise_error(TypeError)
end
it "raises an ArgumentError when 2 or more arguments is passed" do
lambda { [:a, :b].at(0,1) }.should raise_error(ArgumentError)
end
end
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