Align tests with RE

[uglide]

Improve assertions to make tests compatible with RE

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[mgravell]

Note that the failing size assertions are pretty new - if they're going to cause problems, we can probably just... not do that.

[uglide]

@mgravell, they are actually quite helpful for the case when the tested endpoint is not local but a remote RE cluster with some extra latency. I just need to fix some mistakes to make it work with both OSS and RE

[mgravell]

@uglide what's the status of this one; still in progress? do you want me to take it over? or...?