Hygiene: simplify assert.closeTo and assert.contains
Hygiene: simplify assert.closeTo and assert.contains

This is to make failure output a bit nicer and more useful
when assertions fail by showing the actual result.

Change-Id: I64bb8e6839f343e8718234a542b5fc74a0718114

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps