improve test coverage

[suchen-sci]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 55.29% and project coverage change: +2.28 🎉

Comparison is base (f3e6c63) 79.84% compared to head (ab11cae) 82.12%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1014      +/-   ##
==========================================
+ Coverage   79.84%   82.12%   +2.28%     
==========================================
  Files         135      135              
  Lines       14956    14972      +16     
==========================================
+ Hits        11941    12296     +355     
+ Misses       2410     2122     -288     
+ Partials      605      554      -51     

Impacted Files	Coverage Δ
pkg/cluster/layout.go	100.00% <ø> (+14.28%)	⬆️
pkg/cluster/op.go	94.51% <ø> (+28.04%)	⬆️
pkg/object/mqttproxy/broker.go	72.81% <32.35%> (-0.91%)	⬇️
pkg/object/mqttproxy/client.go	76.92% <50.00%> (-0.54%)	⬇️
pkg/object/mqttproxy/session.go	79.16% <70.45%> (+11.45%)	⬆️
pkg/cluster/syncer.go	88.46% <100.00%> (+6.41%)	⬆️
pkg/object/mqttproxy/sessioncache.go	100.00% <100.00%> (+40.40%)	⬆️

... and 19 files with indirect coverage changes

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