Can't wrap firebase function using firebase-function-testing

Question

When I use the wrap function from firebase-functions-test I got this error message

Error Message

TypeError: Cannot read properties of undefined (reading 'length')

at isV2CloudFunction (node_modules/firebase-functions-test/lib/main.js:49:26) at wrap (node_modules/firebase-functions-test/lib/main.js:32:9)

Test file code

const firebaseFunctionsTest = require("firebase-functions-test");
const {wrap} =  firebaseFunctionsTest()
describe('Firestore Function Test', ()=>{
    let wrappedFunction = wrap(firestoreFunction.firestoreFunction)

    beforeEach(()=>{    
        wrappedFunction()
    })

})

Function file code

exports.firestoreFunction = functions.firestore.document('/collection/doc').onCreate(
    async(snap, context)=>{
       //function logic
});

function functionA(){
  //function A logic
}

function functionB(){
  //function B logic
}

module.exports = {
  functionA,
  functionB
}

Have you already checked this documentation? wrap requires you to declare and import the function in your test file code. Also, could you please include your package.json to check what dependencies version are you using. — Marc Anthony B
– Marc Anthony B, Commented Jul 12, 2022 at 5:09
yes, I have declared the function in the test file, the problem is now solved by changing the exports of the function to be with the other functions in the module.exports. — Mohammed Ali
– Mohammed Ali, Commented Jul 12, 2022 at 5:45

Marc Anthony B · Accepted Answer · 2022-07-13 00:46:09Z

1

In the file function, I have used two methods of export, so in the test file when I call firestoreFunction.firestoreFunction it will be undefined.

Changing the function file has solved it.

const firestoreFunction = functions.firestore.document('/collection/doc').onCreate(
    async(snap, context)=>{
       //function logic
});

function functionA(){
  //function A logic
}

function functionB(){
  //function B logic
}

module.exports = {
  firestoreFunction,
  functionA,
  functionB
}

edited Jul 13, 2022 at 0:46

Marc Anthony B

4,1392 gold badges11 silver badges23 bronze badges

answered Jul 12, 2022 at 5:53

Mohammed Ali

1552 silver badges7 bronze badges

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