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