I have a class in my project which has some code like below.

myRepo.js

class MyRepo{
    constructor(){
        this.fnType={
            "Member":this.getMemberDetails,
            "Claim":this.getClaimDetails
        }
    }
    getMemberDetails=async({parameters})=>{
        //some operation
        return someData;
    }
    getClaimDetails=async({parameters})=>{
        //some operation
        return someData;
    }

}

This class is being used in one other service file which dynamically calls one of the functions of myRepo class based on some parameter.

service.js

    const service=(myRepo)=>{
    const queryType=getQueryType(); // Will return either 'Member' or 'Claim'
    let reponse=myrepo.fnType[queryType](someParameters); // how to mock this line?  

}

Using jest, how can write tests for service.js so that I am able to mock the dynamic method selection behaviour and not receive an undefined error on below line.

let reponse=myrepo.fnType[queryType](someParameters);