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same

  • to[.not].be.same

The same assertion compares the actual and expected values much like equal in that array elements and object properties are compared recursively. The difference is that while equal uses the == operator (and hence allows for type conversions), the same assertion uses === (like be).

This means that for non-arrays and non-objects, same is equivalent to be.

expect(1).to.be.same('1');  // fails since 1 !== '1'

expect(1).to.be.same(1);   // succeeds just like "to.be(1)"

For object and arrays, same compares corresponding properties and elements with the same logic. In other words, the following passes for equal and fails for `same``:

let a = {
    a: [ 2 ]
};

let b = {
    a: [ '2' ]
}

expect(a).to.equal(b);      // passes since 2 == '2'
expect(a).to.be.same(b);    // fails because 2 !== '2'

Objects must have all the same keys and arrays must have exactly the same numbers of elements.