Improve Test Coverage

[codecov-commenter]

Codecov Report

Merging #63 (72e4eb4) into dev (d50ce9d) will decrease coverage by 4.70%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #63      +/-   ##
==========================================
- Coverage   64.62%   59.92%   -4.71%     
==========================================
  Files          30       29       -1     
  Lines        6562     5260    -1302     
==========================================
- Hits         4241     3152    -1089     
+ Misses       2321     2108     -213     

Impacted Files	Coverage Δ
lib/src/lightwallet/data.rs	59.43% <100.00%> (+20.44%)	:arrow_up:
lib/src/lightwallet/walletzkey.rs	72.72% <0.00%> (-9.46%)	:arrow_down:
lib/src/blaze/block_witness_data.rs	72.34% <0.00%> (-8.90%)	:arrow_down:
lib/src/blaze/fixed_size_buffer.rs	93.75% <0.00%> (-3.82%)	:arrow_down:
lib/src/lightclient/checkpoints.rs	87.75% <0.00%> (-3.29%)	:arrow_down:
lib/src/lightwallet/message.rs	97.53% <0.00%> (-0.80%)	:arrow_down:
lib/src/commands.rs	0.00% <0.00%> (-0.14%)	:arrow_down:
lib/src/grpc_connector.rs	80.09% <0.00%> (-0.09%)	:arrow_down:
lib/src/lightclient/tests.rs
lib/src/lightwallet.rs	69.63% <0.00%> (+0.13%)	:arrow_up:
... and 7 more

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[AloeareV]

Making the tests themselves no-longer-covered by tarpaulin seems to be confusing code-cov a bit.