Common test runner code.

[optout21]

Each coin type had some lengthy code for running test cases, some slightly different, some with bugs. E.g. it did not handle well the cases when there was no error expected but there was error, or when there was error expected but there was no error (in this case it used the nil err value!). Test usage is unified now. Drawback: each unit test call goes to the common codec dispatcher code, not directly to the coin-specific handler method.

Further improvement: extract all test calls into a large data-only json file. Could be even factored out into an own, language-independent repo.

[codecov[bot]]

Codecov Report

Merging #6 into master will decrease coverage by 0.52%. The diff coverage is 90.69%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   94.86%   94.33%   -0.53%     
==========================================
  Files          14       15       +1     
  Lines         331      371      +40     
==========================================
+ Hits          314      350      +36     
- Misses          9       11       +2     
- Partials        8       10       +2

Impacted Files	Coverage Δ
codec.go	100% <100%> (ø)	:arrow_up:
test_runner.go	90% <90%> (ø)

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[optout21]

Hmm, code coverage decreased, I think because I have removed a lot of duplicated test runner code, hence the basis LOC has been decreased... Real coverage has not decreased, as I kept all the existing test cases.

[optout21]

Coverage improved.