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Check that concat does not change the existing arrays #16

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14 changes: 14 additions & 0 deletions spec/MyArraySpec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,20 @@ describe('MyArray', function () {
expect(result.get(3)).toEqual('4');
expect(result.get(4)).toEqual(42);
});

it('concat does not change the existing arrays', function () {
var array = MyArray.of(1, '2', 3);
var other = MyArray.of('4', 42);

array.concat(other);
expect(array.length()).toEqual(3);
expect(other.length()).toEqual(2);
expect(array.get(0)).toEqual(1);
expect(array.get(1)).toEqual('2');
expect(array.get(2)).toEqual(3);
expect(other.get(0)).toEqual('4');
expect(other.get(1)).toEqual(42);
});
});

describe('indexOf(element) returns the first index of the element', function () {
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