String function tests

[codecov-io]

Codecov Report

Merging #203 into master will decrease coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   95.55%   95.54%   -0.02%     
==========================================
  Files        1144     1145       +1     
  Lines       55534    55727     +193     
  Branches     2974     2911      -63     
==========================================
+ Hits        53064    53242     +178     
- Misses       2464     2478      +14     
- Partials        6        7       +1

Impacted Files	Coverage Δ
src/operator-type.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/bit-length.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/bin.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/index.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/octet-length.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/concat.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/null-safe-concat.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/char-length.ts	100% <100%> (ø)
src/expr-library/string/ascii.ts	100% <100%> (ø)	:arrow_up:
src/execution/util/operation/assert-exists.ts	88.88% <0%> (-5.56%)	:arrow_down:
... and 9 more

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