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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#shift" do
it "removes and returns the first element" do
a = [5, 1, 1, 5, 4]
a.shift.should == 5
a.should == [1, 1, 5, 4]
a.shift.should == 1
a.should == [1, 5, 4]
a.shift.should == 1
a.should == [5, 4]
a.shift.should == 5
a.should == [4]
a.shift.should == 4
a.should == []
end
it "returns nil when the array is empty" do
[].shift.should == nil
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.shift.should == []
empty.should == []
array = ArraySpecs.recursive_array
array.shift.should == 1
array[0..2].should == ['two', 3.0, array]
end
it "raises a FrozenError on a frozen array" do
-> { ArraySpecs.frozen_array.shift }.should raise_error(FrozenError)
end
it "raises a FrozenError on an empty frozen array" do
-> { ArraySpecs.empty_frozen_array.shift }.should raise_error(FrozenError)
end
describe "passed a number n as an argument" do
it "removes and returns an array with the first n element of the array" do
a = [1, 2, 3, 4, 5, 6]
a.shift(0).should == []
a.should == [1, 2, 3, 4, 5, 6]
a.shift(1).should == [1]
a.should == [2, 3, 4, 5, 6]
a.shift(2).should == [2, 3]
a.should == [4, 5, 6]
a.shift(3).should == [4, 5, 6]
a.should == []
end
it "does not corrupt the array when shift without arguments is followed by shift with an argument" do
a = [1, 2, 3, 4, 5]
a.shift.should == 1
a.shift(3).should == [2, 3, 4]
a.should == [5]
end
it "returns a new empty array if there are no more elements" do
a = []
popped1 = a.shift(1)
popped1.should == []
a.should == []
popped2 = a.shift(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.shift(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.shift(5).should_not equal(a)
a = [1, 2, 3, 4, 5]
a.shift(6).should_not equal(a)
end
it "raises an ArgumentError if n is negative" do
->{ [1, 2, 3].shift(-1) }.should raise_error(ArgumentError)
end
it "tries to convert n to an Integer using #to_int" do
a = [1, 2, 3, 4]
a.shift(2.3).should == [1, 2]
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
a.should == [3, 4]
a.shift(obj).should == [3, 4]
a.should == []
end
it "raises a TypeError when the passed n cannot be coerced to Integer" do
->{ [1, 2].shift("cat") }.should raise_error(TypeError)
->{ [1, 2].shift(nil) }.should raise_error(TypeError)
end
it "raises an ArgumentError if more arguments are passed" do
->{ [1, 2].shift(1, 2) }.should raise_error(ArgumentError)
end
it "does not return subclass instances with Array subclass" do
ArraySpecs::MyArray[1, 2, 3].shift(2).should be_an_instance_of(Array)
end
end
end
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