Firebase Auth Emulator - Golang: Project not found - firebase

Question

Recently I started testing my go server, which uses firebase admin sdk, with firebase local emulator suite. It works perfectly with firestore, but with the authentication not so much.
I tried many different approaches, including firebase demo project, my own demo project, and a simple test project. Nothing of those did the job; I kept receive the same error message, project not found.
Firebase Emulator
I use the firebase admin SDK, and I followed the insructions in the
official firebase article.
To configure the emulator, I ran firebase init and firebase init emulators in terminal. Those resulted in the files in the next section. Then the emulator starts with the command firebase emulators:start, and I added --project test to set the project ID.
Simplified Code
firebase.json
{
"emulators": {
"auth": {
"port": 9099
}
}
}
Simple JSON which describes the port for auth service.
.firebaserc
{}
This is empty because it doesn't have any project set, but I also tried adding projects here. Anyway, the project ID is set to "test" in both terminals, the one that runs the emulator, and the one that runs the golang app.
main.go
package main
import (
"context"
firebase "firebase.google.com/go"
"firebase.google.com/go/auth"
)
func main() {
ctx := context.Background()
config := &firebase.Config{ProjectID: "test"}
app, _ := firebase.NewApp(ctx, config)
Auth, _ := app.Auth(ctx)
params := (&auth.UserToCreate{}).
DisplayName("Some Name").
Email("example#gmail.com").
Password("password")
_, err := Auth.CreateUser(ctx, params)
if err != nil {
panic(err)
}
}
On the final line it panics with error status 400 Bad Request, and message PROJECT_NOT_FOUND. It looks like the admin SDK is looking at a public project with project ID "test", and I'm trying to emulate a local project.
Firestore emulator works, Auth does not.
I haven't found a single solution for this in golang. In node.js admin SDK the local auth emulator works, but I need the golang admin SDK.
How can I tell the go admin SDK for firebase auth emulator to look for a local project?