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