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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../shared/end', __FILE__)
describe "Range#last" do
it_behaves_like(:range_end, :last)
ruby_version_is "1.9" do
it "returns the specified number of elements from the end" do
(1..5).last(3).should == [3, 4, 5]
end
it "returns an empty array for an empty Range" do
(0...0).last(2).should == []
end
it "returns an empty array when passed zero" do
(0..2).last(0).should == []
end
it "returns all elements in the range when count exceeds the number of elements" do
(2..4).last(5).should == [2, 3, 4]
end
it "raises an ArgumentError when count is negative" do
lambda { (0..2).last(-1) }.should raise_error(ArgumentError)
end
it "calls #to_int to convert the argument" do
obj = mock_int(2)
(3..7).last(obj).should == [6, 7]
end
it "raises a TypeError if #to_int does not return an Integer" do
obj = mock("to_int")
obj.should_receive(:to_int).and_return("1")
lambda { (2..3).last(obj) }.should raise_error(TypeError)
end
it "truncates the value when passed a Float" do
(2..9).last(2.8).should == [8, 9]
end
it "raises a TypeError when passed nil" do
lambda { (2..3).last(nil) }.should raise_error(TypeError)
end
it "raises a TypeError when passed a String" do
lambda { (2..3).last("1") }.should raise_error(TypeError)
end
end
end
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