test: add unit tests regarding issue 2901

[wlynxg]

pr #2915 also fixes the problems mentioned in issue #2901. This submission adds unit tests for issue #2901.

[codecov-commenter]

Codecov Report

Patch coverage: 77.15% and project coverage change: -0.02% ⚠️

Comparison is base (74bf1b4) 79.15% compared to head (df22652) 79.13%.
Report is 7 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2930      +/-   ##
==========================================
- Coverage   79.15%   79.13%   -0.02%     
==========================================
  Files         638      639       +1     
  Lines       52570    52607      +37     
==========================================
+ Hits        41611    41633      +22     
- Misses       8892     8908      +16     
+ Partials     2067     2066       -1     

Flag	Coverage Δ
go-1.18-386	79.22% <77.15%> (+0.03%)	⬆️
go-1.18-amd64	79.21% <77.15%> (+0.01%)	⬆️
go-1.19-386	79.06% <77.15%> (-0.05%)	⬇️
go-1.19-amd64	79.04% <77.15%> (-0.07%)	⬇️
go-1.20-386	79.14% <77.15%> (-0.09%)	⬇️
go-1.20-amd64	79.17% <77.15%> (-0.03%)	⬇️

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Files Changed	Coverage Δ
container/gmap/gmap_hash_str_any_map.go	98.20% <ø> (ø)
database/gdb/gdb.go	68.34% <ø> (ø)
database/gdb/gdb_result.go	36.00% <ø> (+3.85%)	⬆️
internal/instance/instance.go	100.00% <ø> (ø)
os/gcache/gcache.go	96.77% <ø> (ø)
os/gtime/gtime.go	86.93% <ø> (ø)
text/gregex/gregex_cache.go	100.00% <ø> (ø)
text/gstr/gstr_slashes.go	100.00% <ø> (ø)
text/gstr/gstr_sub.go	93.47% <ø> (ø)
contrib/drivers/dm/dm.go	69.70% <45.83%> (-0.55%)	⬇️
... and 20 more

... and 4 files with indirect coverage changes

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