lengthOf - comparing lengths of 2 arrays/objects is discouraging, lengthsEqual needed

[1aerostorm]

This code:

assert.equal(res.length, 5);

could be rewrote to:

assert.lengthOf(res, 5);

And it is short and graceful.

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But this code:

assert.equal(res.length, res2.length);

could be rewrote only to:

assert.lengthOf(res, res2.length);

which occasionally causes mistakes with omitted or excessive ".length".

More consistent way is to rewrite it to:

assert.lengthsEqual(res, res2);