Problem: (fix #1272) chain-abci restore_from_storage not unit tested

[linfeng-crypto]

solution:
because the function restore_from_storege is private, I added a unit test to test the other function new_with_storage which can cover it.

[codecov]

Codecov Report

Merging #1513 into master will increase coverage by 0.56%.
The diff coverage is 96.66%.

@@            Coverage Diff             @@
##           master    #1513      +/-   ##
==========================================
+ Coverage   65.19%   65.75%   +0.56%     
==========================================
  Files         162      161       -1     
  Lines       21451    21789     +338     
==========================================
+ Hits        13984    14327     +343     
+ Misses       7467     7462       -5     

Impacted Files	Coverage Δ
chain-abci/tests/abci_app.rs	94.85% <96.66%> (+0.20%)	⬆️
chain-core/src/state/account/address.rs	68.18% <0.00%> (-20.46%)	⬇️
chain-tx-enclave/mock-utils/src/lib.rs	97.22% <0.00%> (-2.78%)	⬇️
chain-storage/src/jellyfish.rs	88.28% <0.00%> (-2.26%)	⬇️
chain-core/src/state/account.rs	85.47% <0.00%> (-0.43%)	⬇️
chain-core/src/common/merkle_tree.rs	97.81% <0.00%> (-0.22%)	⬇️
client-rpc/src/server.rs	6.08% <0.00%> (-0.17%)	⬇️
cro-clib/src/jsonrpc.rs	0.00% <0.00%> (ø)
client-cli/src/command.rs	0.00% <0.00%> (ø)
client-rpc/src/program.rs	0.00% <0.00%> (ø)
... and 28 more

[leejw51crypto]

lgtm

[tomtau]

or seems codecov isn't precise

[tomtau]

bors r+

[bors]

Build succeeded:

• continuous-integration/travis-ci/push
• drone-hw/push