Add unit tests

[bohrnsen]

Dear contributors, We are a group of five students at the royal institute of technology in Stockholm. Our task in one course is to increase branch coverage in an open source project. We have analysed the current code with lizard and added some unit tests which reach branches that was not reached with previous tests.

We hope that these test could come in handy in your future development.

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by 0.93%. The diff coverage is 77.92%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   68.01%   68.95%   +0.93%     
==========================================
  Files         107      107              
  Lines        7285     7327      +42     
  Branches     1378     1379       +1     
==========================================
+ Hits         4955     5052      +97     
+ Misses       1879     1837      -42     
+ Partials      451      438      -13

Impacted Files	Coverage Δ
src/main/java/com/jsoniter/Codegen.java	58.72% <100%> (+0.73%)	:arrow_up:
src/main/java/com/jsoniter/spi/Config.java	84.39% <100%> (+0.09%)	:arrow_up:
src/main/java/com/jsoniter/spi/OmitValue.java	90.9% <100%> (+3.69%)	:arrow_up:
...c/main/java/com/jsoniter/IterImplForStreaming.java	76.74% <75.36%> (+6.57%)	:arrow_up:
src/main/java/com/jsoniter/IterImpl.java	69.4% <0%> (+2.96%)	:arrow_up:
src/main/java/com/jsoniter/IterImplSkip.java	76.19% <0%> (+4.76%)	:arrow_up:
src/main/java/com/jsoniter/spi/Decoder.java	91.66% <0%> (+8.33%)	:arrow_up:
... and 1 more

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Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e21a29f...a8cb20c. Read the comment docs.

[codecov-commenter]

Codecov Report

Merging #156 into master will increase coverage by 0.91%. The diff coverage is 77.92%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   68.04%   68.95%   +0.91%     
==========================================
  Files         107      107              
  Lines        7231     7327      +96     
  Branches     1367     1379      +12     
==========================================
+ Hits         4920     5052     +132     
+ Misses       1870     1837      -33     
+ Partials      441      438       -3     

Impacted Files	Coverage Δ
...c/main/java/com/jsoniter/IterImplForStreaming.java	76.74% <75.36%> (+6.57%)	:arrow_up:
src/main/java/com/jsoniter/Codegen.java	58.72% <100.00%> (+0.73%)	:arrow_up:
src/main/java/com/jsoniter/spi/Config.java	84.39% <100.00%> (+0.27%)	:arrow_up:
src/main/java/com/jsoniter/spi/OmitValue.java	90.90% <100.00%> (+3.69%)	:arrow_up:
src/main/java/com/jsoniter/JsonIteratorPool.java	71.42% <0.00%> (-14.29%)	:arrow_down:
...c/main/java/com/jsoniter/ReflectionMapDecoder.java	56.66% <0.00%> (-8.96%)	:arrow_down:
.../main/java/com/jsoniter/output/CodegenImplMap.java	95.31% <0.00%> (-2.94%)	:arrow_down:
...java/com/jsoniter/output/ReflectionMapEncoder.java	71.42% <0.00%> (-2.94%)	:arrow_down:
src/main/java/com/jsoniter/CodegenAccess.java	67.53% <0.00%> (-1.81%)	:arrow_down:
src/main/java/com/jsoniter/JsonIterator.java	64.70% <0.00%> (-1.57%)	:arrow_down:
... and 14 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 72f70af...a8cb20c. Read the comment docs.