Improve smart contract examples & tests

[github-actions[bot]]

Test Coverage

Summary

Lines	Statements	Branches	Functions
	100% (3425/3425)	100% (805/805)	100% (708/708)

Title	Tests	Skipped	Failures	Errors	Time
core	501	0 :zzz:	0 :x:	0 :fire:	1m 5s :stopwatch:
network	660	0 :zzz:	0 :x:	0 :fire:	3m 56s :stopwatch:
errors	48	0 :zzz:	0 :x:	0 :fire:	11.209s :stopwatch:

[socket-security[bot]]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@vechain/ethers@4.0.27-5	network	0	2.72 MB	tony.li
npm/bignumber.js@7.2.1	None	0	385 kB	mikemcl
npm/thor-devkit@2.0.9	None	0	210 kB	tony.li
npm/xmlhttprequest@1.8.0	filesystem, network, shell	0	21.7 kB	driverdan

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