fix: report unmatched diagnostic

[ikatyang]

Fixes #42

[codecov-io]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #52   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          29     29           
  Lines         395    402    +7     
  Branches       48     49    +1     
=====================================
+ Hits          395    402    +7

Impacted Files	Coverage Δ
src/utils/create-setup-expression.ts	100% <ø> (ø)	⬆️
src/utils/create-snapshots.ts	100% <100%> (ø)	⬆️

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