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Upgrading the version to v3 solved the issue.
```go get <http://github.com/pulumi/pulumi/pkg/v3/testing/integration|github.com/pulumi/pulumi/pkg/v3/testing/integration>```


Tip: always make sure that the Pulumi packages come from the same version, otherwise you have the chance that the code tries to register the protobufs spec more than once. I bumped into a similar issue myself earlier this week and learned a thing or two about the protobuf lib in go: <https://github.com/pact-foundation/pact-plugins/issues/4>