Refactor tests

[davidyuk]

https://stackoverflow.com/questions/23492043/change-default-timeout-for-mocha

[codecov]

Codecov Report

Merging #1039 into develop will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1039   +/-   ##
========================================
  Coverage    93.63%   93.63%           
========================================
  Files           58       58           
  Lines         2953     2953           
========================================
  Hits          2765     2765           
  Misses         188      188           

Impacted Files	Coverage Δ
es/ae/index.js	100.00% <100.00%> (ø)
es/contract/aci/index.js	95.34% <100.00%> (ø)
es/tx/builder/index.js	83.21% <100.00%> (ø)
es/tx/validator.js	100.00% <100.00%> (ø)
es/utils/amount-formatter.js	100.00% <100.00%> (ø)
es/utils/bignumber.js	100.00% <100.00%> (ø)
es/utils/bytes.js	100.00% <100.00%> (ø)

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[nduchak]

account2 is used in tests, try to find “ onAccount” in test folder

[davidyuk]

onAccount mentioned 82 times in tests folder, can you point a specific use case?
I have assumed that account2 is not used because it is not imported anywhere, also tests did not fall after removing it 🤷‍♀️
I would suggest defining account2 exactly in tests that are using it.