For example, [this code](https://app.codecov.io/gh/apigee/registry/blob/main/server/registry/actions_apis.go#L60) is untested. Similarly [here](https://app.codecov.io/gh/apigee/registry/blob/main/server/registry/actions_deployments.go#L34). For clarity, the focus of this issue is only the `InvalidArgument` errors in `registry-server` implementation code. Errors such as [this one](https://app.codecov.io/gh/apigee/registry/blob/main/server/registry/actions_apis.go#L115) are harder to exercise and generally are unrelated to API usage, so they are out of scope for this issue.