test: gtid and context ut

[baerwang]

What this PR does:

Which issue(s) this PR fixes:

Fixes #744

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.15% 🎉

Comparison is base (304e9ff) 38.38% compared to head (e85b49f) 38.54%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
+ Coverage   38.38%   38.54%   +0.15%     
==========================================
  Files         254      256       +2     
  Lines       26359    26424      +65     
==========================================
+ Hits        10119    10185      +66     
+ Misses      15121    15120       -1     
  Partials     1119     1119              

Files Changed	Coverage Δ
pkg/runtime/context/context.go	100.00% <100.00%> (ø)
pkg/runtime/gtid/gtid.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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