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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#pop" do
it "removes and returns the last element of the array" do
a = ["a", 1, nil, true]
a.pop.should == true
a.should == ["a", 1, nil]
a.pop.should == nil
a.should == ["a", 1]
a.pop.should == 1
a.should == ["a"]
a.pop.should == "a"
a.should == []
end
it "returns nil if there are no more elements" do
[].pop.should == nil
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.pop.should == []
array = ArraySpecs.recursive_array
array.pop.should == [1, 'two', 3.0, array, array, array, array]
end
it "raises a FrozenError on a frozen array" do
-> { ArraySpecs.frozen_array.pop }.should raise_error(FrozenError)
end
it "raises a FrozenError on an empty frozen array" do
-> { ArraySpecs.empty_frozen_array.pop }.should raise_error(FrozenError)
end
describe "passed a number n as an argument" do
it "removes and returns an array with the last n elements of the array" do
a = [1, 2, 3, 4, 5, 6]
a.pop(0).should == []
a.should == [1, 2, 3, 4, 5, 6]
a.pop(1).should == [6]
a.should == [1, 2, 3, 4, 5]
a.pop(2).should == [4, 5]
a.should == [1, 2, 3]
a.pop(3).should == [1, 2, 3]
a.should == []
end
it "returns an array with the last n elements even if shift was invoked" do
a = [1, 2, 3, 4]
a.shift
a.pop(3).should == [2, 3, 4]
end
it "returns a new empty array if there are no more elements" do
a = []
popped1 = a.pop(1)
popped1.should == []
a.should == []
popped2 = a.pop(2)
popped2.should == []
a.should == []
popped1.should_not equal(popped2)
end
it "returns whole elements if n exceeds size of the array" do
a = [1, 2, 3, 4, 5]
a.pop(6).should == [1, 2, 3, 4, 5]
a.should == []
end
it "does not return self even when it returns whole elements" do
a = [1, 2, 3, 4, 5]
a.pop(5).should_not equal(a)
a = [1, 2, 3, 4, 5]
a.pop(6).should_not equal(a)
end
it "raises an ArgumentError if n is negative" do
->{ [1, 2, 3].pop(-1) }.should raise_error(ArgumentError)
end
it "tries to convert n to an Integer using #to_int" do
a = [1, 2, 3, 4]
a.pop(2.3).should == [3, 4]
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
a.should == [1, 2]
a.pop(obj).should == [1, 2]
a.should == []
end
it "raises a TypeError when the passed n cannot be coerced to Integer" do
->{ [1, 2].pop("cat") }.should raise_error(TypeError)
->{ [1, 2].pop(nil) }.should raise_error(TypeError)
end
it "raises an ArgumentError if more arguments are passed" do
->{ [1, 2].pop(1, 2) }.should raise_error(ArgumentError)
end
it "does not return subclass instances with Array subclass" do
ArraySpecs::MyArray[1, 2, 3].pop(2).should be_an_instance_of(Array)
end
it "raises a FrozenError on a frozen array" do
-> { ArraySpecs.frozen_array.pop(2) }.should raise_error(FrozenError)
-> { ArraySpecs.frozen_array.pop(0) }.should raise_error(FrozenError)
end
end
end
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