Fix data race in tests

[FZambia]

Fixes #253

[codecov]

Codecov Report

Merging #254 (d42db5a) into master (04c92a7) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #254      +/-   ##
==========================================
- Coverage   83.31%   83.21%   -0.11%     
==========================================
  Files          36       36              
  Lines        8193     8197       +4     
==========================================
- Hits         6826     6821       -5     
- Misses       1033     1041       +8     
- Partials      334      335       +1     

Impacted Files	Coverage Δ
metrics.go	84.86% <100.00%> (+0.14%)	⬆️
node.go	92.94% <100.00%> (ø)
internal/recovery/sync.go	76.27% <0.00%> (-3.39%)	⬇️
client.go	83.42% <0.00%> (-0.29%)	⬇️
hub.go	84.45% <0.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more