Field order is different in expected and actual JSON

[rkapka]

Hey there!

I would really like to use your tool, but I encountered an issue with comparing output.

This is the result I get from /eth/v1/beacon/genesis:

{
    "data": {
        "genesis_time": "1606824023",
        "genesis_validators_root": "0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95",
        "genesis_fork_version": "0x00000000"
    }
}

This is my test:

{
  "method": "GET",
  "route": "/eth/v1/beacon/genesis",
  "expectedRespStatus": 200,
  "expectedRespBody": {
    "data": {
      "genesis_time": "1606824023",
      "genesis_validators_root": "0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95",
      "genesis_fork_version": "0x00000000"
    }
  }
}

This test fails

sRoot ./prysm --target http://localhost:4500
GET /eth/v1/beacon/genesis ❌
Expected response body:
{"data":{"genesis_fork_version":"0x00002009","genesis_time":"2020-11-18T12:00:07Z","genesis_validators_root":"0x9436e8a630e3162b7ed4f449b12b8a5a368a4b95bc46b941ae65c11613bfa4c1"}}

Received response body:
{"data":{"genesis_time":"1606824023","genesis_validators_root":"0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95","genesis_fork_version":"0x00000000"}}

It seems that only the expected JSON got canonicalized. I found information that struct field declaration order is preserved when marshalling into JSON, which may be the reason why field order is different between expected and actual.