Full test coverage for rpc-wrapper package

[willemolding]

Depends on #10 #13

A full test suite should be included for the updated rpc-wrapper interface. At a minimum each test must include:

• A successful calling case
• An example of each possible failure case with the expected errors

These are integration tests that require a running Substrate node to run. See #14

Note the completion criteria uses the updated interface definition from #13

Completion Criteria

• getSignerProviderAccounts

  • Success Case
  • Failure Cases

• chainGetMetadata

  • Success Case
  • Failure Cases

• blockHash

  • Success Case
  • Failure Cases

• genesisHash

  • Success Case
  • Failure Cases

• chainGetBlock

  • Success Case
  • Failure Cases

• constant

  • Success Case
  • Failure Cases

• getRuntimeVersion

  • Success Case
  • Failure Cases

• getStorageValue-

  • Success Case
  • Failure Cases

• getStorageMap

  • Success Case
  • Failure Cases

• getStorageMapPaged

  • Success Case
  • Failure Cases

• rpcMethods

  • Success Case
  • Failure Cases

• accountInfo

  • Success Case
  • Failure Cases

• getNonceForAccount

  • Success Case
  • Failure Cases

• palletCallIndex

  • Success Case
  • Failure Cases

• sign

  • Success Case
  • Failure Cases

• send

  • Success Case
  • Failure Cases

• signAndSend

  • Success Case
  • Failure Cases