Unsupported network: zkSyncEraTestNode

[clauBv23]

Hi there, I'm trying to run my hardhat tests on a zksync chain.

I installed "@matterlabs/hardhat-zksync-node" and in my hardhat config file have

networks: {
    hardhat: {
      zksync: true,
    },
...
}

However, when running the tests it fails.

this is the verbose output

hardhat:core:tasks:compile No compilation jobs to compile +0ms
  hardhat:core:hre Running task compile:solidity:log:nothing-to-compile +0ms
  hardhat:core:hre Running task compile:solidity:log:compilation-result +2ms
  hardhat:core:hre Running task compile:remove-obsolete-artifacts +0ms
  hardhat:core:hre Running compile:remove-obsolete-artifacts's super +0ms
  hardhat:core:hre Running task test:get-test-files +19ms
  hardhat:core:hre Running task node-zksync:download-binary +0ms
  hardhat:core:hre Running task test:run-mocha-tests +1s
Error in plugin @matterlabs/hardhat-zksync-node: Failed when running node: Unsupported network: zkSyncEraTestNode

ZkSyncNodePluginError: Failed when running node: Unsupported network: zkSyncEraTestNode

After debuting found that the run-mocha-tests task was the one failing, on this line, but not sure how could be fixed.

Do you have any idea of what I could be doing wrong?

thanks in advance