Firebase Auth testing with jest and emulator calling the login throws Error: Headers X-Client-Version forbidden - node.js

Question

I try to login a dummy user with the firebase js sdk localy. I have the default firebase emulator running. After calling the function i get following exception:
Error: Headers X-Client-Version forbidden
at dispatchError (C:\Users\user\Documents\Projekte\Backend\functions\node_modules\jsdom\lib\jsdom\living\xhr\xhr-utils.js:62:19)
at validCORSPreflightHeaders (C:\Users\user\Documents\Projekte\Backend\functions\node_modules\jsdom\lib\jsdom\living\xhr\xhr-utils.js:99:5)
at Request.<anonymous> (C:\Users\user\Documents\Projekte\Backend\functions\node_modules\jsdom\lib\jsdom\living\xhr\xhr-utils.js:367:12)
at Request.emit (events.js:315:20)
at Request.onRequestResponse (C:\Users\user\Documents\Projekte\Backend\functions\node_modules\request\request.js:1059:10)
at ClientRequest.emit (events.js:315:20)
at HTTPParser.parserOnIncomingClient [as onIncoming] (_http_client.js:641:27)
at HTTPParser.parserOnHeadersComplete (_http_common.js:126:17)
at Socket.socketOnData (_http_client.js:509:22)
at Socket.emit (events.js:315:20) undefined
at VirtualConsole.<anonymous> (node_modules/jsdom/lib/jsdom/virtual-console.js:29:45)
at dispatchError (node_modules/jsdom/lib/jsdom/living/xhr/xhr-utils.js:65:53)
at validCORSPreflightHeaders (node_modules/jsdom/lib/jsdom/living/xhr/xhr-utils.js:99:5)
at Request.<anonymous> (node_modules/jsdom/lib/jsdom/living/xhr/xhr-utils.js:367:12)
at Request.onRequestResponse (node_modules/request/request.js:1059:10)
console.log
t {
code: 'auth/network-request-failed',
message: 'A network error (such as timeout, interrupted connection or unreachable host) has occurred.',
a: null
}
at Object.<anonymous> (test/test.ts:275:12)
If i try to connect to my online project it works fine, but i want to perform my testing localy with the emulator.
Example Code:
const app = firebase.initializeApp(firebaseConfig);
app.auth().useEmulator("http://localhost:9099");
app.firestore().settings({
host: "localhost:8080",
ssl: false,
});
test('Example test case', async () => {
try {
const cred: UserCredential = await app.auth().signInWithEmailAndPassword("foo#bar.de", "bla2377");
expect(cred).toBeTruthy();
expect(cred.user).toBeTruthy();
} catch (e) {
console.log(e);
expect(true).toBeFalsy();
}
});
Enviorment Informations:
Operating System version: Windows 10 Home 10.0.18363 Build 18363
Firebase SDK version: 8.2.3
Jest Version: 26.6.3
Node Version: 14

Answer 1

jsdom doesn't support wildcard access-control-allow-headers, which are used by firebase. This answer fixes the exception.