Update tests. Fix overwrite where condition.

[lav45]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Fixed issues	yiisoft/db#944

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.82%. Comparing base (0f3fd98) to head (6bc8bec).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #407      +/-   ##
============================================
- Coverage     88.04%   87.82%   -0.22%     
  Complexity      575      575              
============================================
  Files            16       16              
  Lines          1372     1372              
============================================
- Hits           1208     1205       -3     
- Misses          164      167       +3     

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