Tests that Page.lifecycleEvent is issued for important events.
[
    [0] : DOMContentLoaded
    [1] : firstContentfulPaint
    [2] : firstMeaningfulPaint
    [3] : firstMeaningfulPaintCandidate
    [4] : firstPaint
    [5] : init
    [6] : load
    [7] : networkAlmostIdle
    [8] : networkIdle
]