[Merge] lp:~phablet-team/qt-halide/unit-tests into lp:qt-halide

[Ugo Riboni]

> re-14) code is missing but at first glance it does not seem to fully do what
> the comment requested "In cases where only 1 emission is expected there is no
> need to actually use this method"

There is no test where I check for only one updatingChanged emission, so I did not implement that part as it was not needed.

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https://code.launchpad.net/~phablet-team/qt-halide/unit-tests/+merge/254064
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