Added test for Match.r

[Azamlynny]

No description provided.

[codecov-io]

Codecov Report

Merging #20 into master will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   78.77%   78.42%   -0.36%     
==========================================
  Files          52       52              
  Lines        7839     7614     -225     
==========================================
- Hits         6175     5971     -204     
+ Misses       1664     1643      -21

Impacted Files	Coverage Δ
R/print.R	80% <0%> (-1.82%)	⬇️
inst/include/util/sparse_array.h	84.14% <0%> (-1.41%)	⬇️
src/re2r_replace.cpp	85.6% <0%> (-1.17%)	⬇️
inst/include/util/sparse_set.h	88.63% <0%> (-1.16%)	⬇️
src/prog.cc	83.79% <0%> (-0.82%)	⬇️
inst/include/re2/prog.h	89.79% <0%> (-0.78%)	⬇️
inst/include/re2/walker-inl.h	84.93% <0%> (-0.6%)	⬇️
src/dfa.cc	68.11% <0%> (-0.44%)	⬇️
src/bitstate.cc	65.71% <0%> (-0.39%)	⬇️
inst/include/re2/bitmap256.h	95.45% <0%> (-0.38%)	⬇️
... and 37 more

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