[iota-indexer]: Add test cases for implemented JSON-RPC APIs

[samuel-rufi]

Description

There are currently no tests in iota-indexer that test the Indexer implementations of the JSON-RPC API traits.

Tasks

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1. [iota-indexer]: Add tests for CoinApi #2196
   team-infra team-sc-platform +2
   
2. [iota-indexer]: Add tests for ExtendedApi #2197
   team-infra team-sc-platform +2
   
3. [iota-indexer]: Add tests for GovernanceApi #2198
   team-infra team-sc-platform +2
   
4. [iota-indexer]: Add tests for IndexerApi #2199
   team-infra team-sc-platform +2
   
5. [iota-indexer]: Add tests for MoveUtils #2200
   team-infra team-sc-platform +2
   
6. [Task (iota-indexer)]: Add tests for ReadApi #2201
   team-infra team-sc-platform +2
   
7. [iota-indexer]: Add tests for TransactionBuilderApi #2202
   team-infra team-sc-platform +2
   
8. [Task (iota-indexer)]: Add tests for WriteApi #2203
   team-infra team-sc-platform +2
   
9. [iota-indexer]: Update new rpc tests to mainnet v1.32.2 #3589
   team-infra team-sc-platform +2
   
10. [iota-indexer]: Use cargo test in the CI #3590
    team-infra team-sc-platform +2
    
11. [iota-indexer]: Optimize tests #3492
    team-infra team-sc-platform +2
    
12. [iota-indexer]: Add staking tests for TransactionBuilderApi #3811
    team-infra team-sc-platform +2
    

[kodemartin]

I think we should prioritize IndexerApi, ReadApi, ExtendedApi.

For the rest it would suffice to reach the same coverage as the iota-json-rpc-tests.

Note

iota-json-rpc-tests can be possibly used as a base, and refactored to use the Indexer JSON-RPC server.

[kodemartin]

For the moments PRs resolving all these issues should target this feature branch: https://github.com/iotaledger/iota/tree/sc-platform/indexer-new-rpc-tests

[kodemartin]

I suggest that the new tests are added as integration tests in iota-indexer.

└── tests/
    ── rpc-tests/
        ├── main.rs
        └── extended_api.rs