Mock data initialization being subject to Firestore rules - firebase-security

Question

I'm testing a simple rule:
match /users/{userId} {
allow write, get: if isSignedIn() && userOwner(userId);
}
function isSignedIn(){
return request.auth != null
}
function userOwner(userId){
return userId == request.auth.uid
}
Here is my test:
test("read succeed only if requested user is authenticated user", async () => {
const db = await setup(
{
uid: "testid",
email: "test#test.com"
},
{
"users/testid": {},
"users/anotherid": {}
}
);
const userRef = db.collection("users");
expect(await assertSucceeds(userRef.doc("testid").get()));
expect(await assertFails(userRef.doc("anotherid").get()));
})
And the setup method:
export const setup = async (auth?: any, data?: any) => {
const projectId = `rules-spec-${Date.now()}`;
const app = firebase.initializeTestApp({
projectId,
auth
});
const db = app.firestore();
if (data) {
for (const key in data) {
const ref = db.doc(key);
await ref.set(data[key]);
}
}
await firebase.loadFirestoreRules({
projectId,
rules: fs.readFileSync("firestore.rules").toString()
});
return db;
};
It throws the following error :
FirebaseError: 7 PERMISSION_DENIED:
false for 'create' # L5, Null value error. for 'create' # L9
It seems that when it tries to set the mock data given in setup, it can't because of the write rule. but I don't understand, I load the rules after the database being set.
Any idea what's going on here?

Answer 1

You can try setting the rules to be open before you populate the database.
After the data is set you load the rules you are trying to test.
export const setup = async(auth ? : any, data ? : any) => {
const projectId = `rules-spec-${Date.now()}`;
const app = firebase.initializeTestApp({
projectId,
auth
});
const db = app.firestore();
await firebase.loadFirestoreRules({
projectId,
rules:
"service cloud.firestore {match/databases/{database}/documents" +
"{match /{document=**} {" +
"allow read, write: if true;" +
"}}}",
});
if (data) {
for (const key in data) {
const ref = db.doc(key);
await ref.set(data[key]);
}
}
await firebase.loadFirestoreRules({
projectId,
rules: fs.readFileSync("firestore.rules").toString()
});
return db;
};