Trying to initialize test environment with v9 firestore sdk using jest - firebase

Question

Im trying to set up my testing environment to test my security fules with firestore. I've copied this code from https://firebase.google.com/docs/rules/unit-tests#before_you_run_the_emulator
let testEnv : RulesTestEnvironment;
beforeAll(async () => {
testEnv = await initializeTestEnvironment({
projectId: "demo-project-1234",
firestore: {
rules: fs.readFileSync('firestore.rules', 'utf8'),
},
});
});
However, I'm getting this error.
The host and port of the firestore emulator must be specified. (You may wrap the test script with firebase emulators:exec './your-test-script' to enable automatic discovery, or specify manually via initializeTestEnvironment({firestore: {host, port}}).
Anyone know how to solve this?
EDIT
I tried adding host and port to my running emulator like so
let testEnv : RulesTestEnvironment;
beforeAll(async () => {
testEnv = await initializeTestEnvironment({
projectId: "comment-section-e9c09",
firestore: {
rules: fs.readFileSync('firestore.rules', 'utf8'),
host:'localhost',
port:8080
},
});
});
Now it seems to be able to connect to my emulator, but when I try to fx clear the database like
test("sefse", () => {
testEnv.clearDatabase()
})
I get the following error
[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "Error: The host and port of the database emulator must be specified. (You may wrap the test script with 'firebase emulators:exec './your-test-script'' to enable automatic discovery, or specify manually via initializeTestEnvironment({database: {host, port}}).".] {

Answer 1

I give u a "mocha-based" starting point:
security.test.js:
import { readFileSync } from 'fs';
import { assertFails, assertSucceeds, initializeTestEnvironment } from "#firebase/rules-unit-testing";
import { doc, getDoc, setDoc } from "firebase/firestore";
let testEnv;
let unauthedDb;
describe("general database behaviour", () => {
before(async () => {
testEnv = await initializeTestEnvironment({
projectId: "demo-project-1234",
firestore: {
rules: readFileSync("firestore.rules", "utf8"),
host: "127.0.0.1",
port: "8080"
},
});
unauthedDb = testEnv.unauthenticatedContext().firestore();
});
after(async () => {
await testEnv.cleanup();
});
it("should let read anyone the database", async () => {
await testEnv.withSecurityRulesDisabled(async (context) => {
await setDoc(doc(context.firestore(), 'data/foobar'), { foo: 'bar' });
});
await assertSucceeds(getDoc(doc(unauthedDb, 'data/foobar')))
})
it("should not allow writing the database", async () => {
await assertFails(setDoc(doc(unauthedDb, '/data/foobar'), { something: "something" }))
})
})

Answer 2

Did you specify the firestore port and rules path in your firebase.json file like so?
"emulators": {
"firestore": {
"port": 8080
}
},
"firestore": {
"rules": "./rules/firestore.rules"
}