test: assert events emitted from contract

[chungquantin]

Link to issue: #181
Refactor fungible integration-tests contract to emit events by default and catch those events in the integration test cases.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.89%. Comparing base (7bbc04c) to head (c6d390d).
Report is 2 commits behind head on daan/api.

@@             Coverage Diff              @@
##           daan/api     #216      +/-   ##
============================================
+ Coverage     45.92%   48.89%   +2.97%     
============================================
  Files            47       47              
  Lines          4279     4532     +253     
  Branches       4279     4532     +253     
============================================
+ Hits           1965     2216     +251     
- Misses         2252     2254       +2     
  Partials         62       62              

see 10 files with indirect coverage changes

[chungquantin]

@Daanvdplas Could I receive review for this PR?

[Daanvdplas]

Looking good! Left small nitpicks.

This PR is going to daan/api but I'm not sure whether we want this. I say we really focus on getting frank/extension merged and then rebase those small PRs.

[evilrobot-01]

A few things need tweaking I'm afraid: return type of call not checked before emitting events, token terminology throughout (may want to get that PR merged first) and then it needs conflicts resolving.

[evilrobot-01]

Looks good, pleased with the event naming.