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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#last" do
it "returns the last element" do
[1, 1, 1, 1, 2].last.should == 2
end
it "returns nil if self is empty" do
[].last.should == nil
end
it "returns the last count elements if given a count" do
[1, 2, 3, 4, 5, 9].last(3).should == [4, 5, 9]
end
it "returns an empty array when passed a count on an empty array" do
[].last(0).should == []
[].last(1).should == []
end
it "returns an empty array when count == 0" do
[1, 2, 3, 4, 5].last(0).should == []
end
it "returns an array containing the last element when passed count == 1" do
[1, 2, 3, 4, 5].last(1).should == [5]
end
it "raises an ArgumentError when count is negative" do
lambda { [1, 2].last(-1) }.should raise_error(ArgumentError)
end
it "returns the entire array when count > length" do
[1, 2, 3, 4, 5, 9].last(10).should == [1, 2, 3, 4, 5, 9]
end
it "returns an array which is independent to the original when passed count" do
ary = [1, 2, 3, 4, 5]
ary.last(0).replace([1,2])
ary.should == [1, 2, 3, 4, 5]
ary.last(1).replace([1,2])
ary.should == [1, 2, 3, 4, 5]
ary.last(6).replace([1,2])
ary.should == [1, 2, 3, 4, 5]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.last.should equal(empty)
array = ArraySpecs.recursive_array
array.last.should equal(array)
end
it "tries to convert the passed argument to an Integer usinig #to_int" do
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
[1, 2, 3, 4, 5].last(obj).should == [4, 5]
end
it "raises a TypeError if the passed argument is not numeric" do
lambda { [1,2].last(nil) }.should raise_error(TypeError)
lambda { [1,2].last("a") }.should raise_error(TypeError)
obj = mock("nonnumeric")
lambda { [1,2].last(obj) }.should raise_error(TypeError)
end
it "does not return subclass instance on Array subclasses" do
ArraySpecs::MyArray[].last(0).should be_an_instance_of(Array)
ArraySpecs::MyArray[].last(2).should be_an_instance_of(Array)
ArraySpecs::MyArray[1, 2, 3].last(0).should be_an_instance_of(Array)
ArraySpecs::MyArray[1, 2, 3].last(1).should be_an_instance_of(Array)
ArraySpecs::MyArray[1, 2, 3].last(2).should be_an_instance_of(Array)
end
it "is not destructive" do
a = [1, 2, 3]
a.last
a.should == [1, 2, 3]
a.last(2)
a.should == [1, 2, 3]
a.last(3)
a.should == [1, 2, 3]
end
end
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