test: add integration test

[ibrizsabin]

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Changelog Entry

version: <log entry>

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• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have run the unit tests
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Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (a9bc05a) 69.52% compared to head (452320c) 67.04%.

Additional details and impacted files

@@                                Coverage Diff                                 @@
##             development/177-xcall-future-proof-messaging     #216      +/-   ##
==================================================================================
- Coverage                                           69.52%   67.04%   -2.49%     
+ Complexity                                             64       62       -2     
==================================================================================
  Files                                                  40       41       +1     
  Lines                                                2169     2403     +234     
  Branches                                               24       24              
==================================================================================
+ Hits                                                 1508     1611     +103     
- Misses                                                651      781     +130     
- Partials                                               10       11       +1     

Flag	Coverage Δ
rust	61.91% <0.00%> (-2.43%)	⬇️
solidity	86.07% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ontracts/cosmwasm-vm/cw-xcall-lib/src/xcall_msg.rs	0.00% <ø> (ø)
...smwasm-vm/cw-xcall-lib/src/message/call_message.rs	0.00% <0.00%> (ø)
...cw-xcall-lib/src/message/call_message_persisted.rs	0.00% <0.00%> (ø)
.../cw-xcall-lib/src/message/call_message_rollback.rs	28.57% <0.00%> (ø)
...s/cosmwasm-vm/cw-xcall-lib/src/message/envelope.rs	15.55% <0.00%> (-0.73%)	⬇️
...tracts/cosmwasm-vm/cw-xcall-lib/src/message/mod.rs	48.00% <0.00%> (-9.15%)	⬇️
contracts/cosmwasm-vm/cw-xcall/src/contract.rs	76.08% <0.00%> (+1.89%)	⬆️
...ontracts/cosmwasm-vm/cw-xcall/src/types/message.rs	41.42% <0.00%> (-1.86%)	⬇️
...ontracts/cosmwasm-vm/cw-xcall/src/types/request.rs	74.80% <0.00%> (-1.20%)	⬇️
contracts/cosmwasm-vm/cw-xcall/src/types/result.rs	49.38% <0.00%> (+2.83%)	⬆️

... and 14 files with indirect coverage changes

[AntonAndell]

Would it be possible to also add a test for the response during execution or is that to complicated?

[AntonAndell]

Looks good