Fix PHPUnit Risky Tests

[dplewis]

Some tests were missing assert

[codecov]

Codecov Report

Merging #449 into master will increase coverage by 1.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master   #449      +/-   ##
==========================================
+ Coverage     96.98%    98%   +1.01%     
  Complexity     1058   1058              
==========================================
  Files            39     39              
  Lines          2950   2950              
==========================================
+ Hits           2861   2891      +30     
+ Misses           89     59      -30

Impacted Files	Coverage Δ	Complexity Δ
src/Parse/ParseObject.php	98.1% <0%> (+0.17%)	224% <0%> (ø)	⬇️
src/Parse/ParseUser.php	98.31% <0%> (+1.26%)	67% <0%> (ø)	⬇️
src/Parse/Internal/ParseRelationOperation.php	100% <0%> (+1.66%)	43% <0%> (ø)	⬇️
src/Parse/ParseClient.php	95.59% <0%> (+2.64%)	97% <0%> (ø)	⬇️
src/Parse/ParseACL.php	100% <0%> (+5.83%)	61% <0%> (ø)	⬇️
src/Parse/ParseSessionStorage.php	100% <0%> (+9.09%)	11% <0%> (ø)	⬇️
src/Parse/ParseMemoryStorage.php	100% <0%> (+12.5%)	8% <0%> (ø)	⬇️
src/Parse/ParsePush.php	100% <0%> (+14.28%)	13% <0%> (ø)	⬇️

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