test: add network service test cases

[luciorubeens]

Summary

Additional changes for #516

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #518 into develop will increase coverage by 0.16%.
The diff coverage is 9.19%.

@@            Coverage Diff             @@
##           develop    #518      +/-   ##
==========================================
+ Coverage     4.69%   4.85%   +0.16%     
==========================================
  Files           93      94       +1     
  Lines         5152    5146       -6     
  Branches      1094    1090       -4     
==========================================
+ Hits           242     250       +8     
+ Misses        4896    4882      -14     
  Partials        14      14

Impacted Files	Coverage Δ
...rc/app/pages/contacts/contact-list/contact-list.ts	0% <ø> (ø)	⬆️
...pp/pages/profiles/profile-signin/profile-signin.ts	0% <0%> (ø)	⬆️
...rc/app/pages/wallet/wallet-import/wallet-import.ts	0% <0%> (ø)	⬆️
src/app/pipes/account-label/account-label.ts	0% <0%> (ø)	⬆️
src/app/pages/delegates/delegates.ts	0% <0%> (ø)	⬆️
src/app/services/market-data/market-data.ts	0% <0%> (ø)	⬆️
.../components/input-amount/input-amount.component.ts	0% <0%> (ø)	⬆️
...pp/components/wallet-picker/wallet-picker.modal.ts	0% <0%> (ø)	⬆️
...ction/transaction-response/transaction-response.ts	0% <0%> (ø)	⬆️
...s/transaction/transaction-show/transaction-show.ts	0% <0%> (ø)	⬆️
... and 27 more

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[clucasalcantara]

Seems fine 👌