I think tests are still wrong.

For example. From your tests:

consolidate([ 4, 8 ], [ 5, 6 ], [ 9, 11 ], [ 2, 5 ] ])
Result lengths should match. [Expected 1 got 2]
expected result: [9,11]

In the kata description you say that the result of this test should be: [[2,8],[9,11]]

I think you need to decide if two contiguous time intervals must be consolidated in one or not.

Another example:

consolidate( [ [ -2, 0 ],
[ 0, 0 ],
[ 4, 11 ],
[ 22, 500 ],
[ 1, 11 ],
[ -1, -1 ],
[ 7, 8 ],
[ 500, 500 ] ]));

I think the result should be: [ [ -2, 11 ], [ 22, 500 ] ]

But your tests say that: Result lengths should match. [Expected 1 got 2]
expected result: [22,500]

My guess is that your solution is wrong.