Wrote test case for a if-else condition but getting an undefined error

I have an if-else condition outside of any function to execute a piece of code, I wrote the corresponding testcase but got an error of an undefined variable. here is the js code & testcase respectively.

if(weburl.indexOf('?webUrl=') >= 0){
weburlParam = weburl.split('?');
walletService.getWalletStatus(weburlParam[1]).then(function(res){
    $scope.getWalletRes();
}, function(error){
    walletService.redirectToErrorPage();
});
} else {
walletService.getWalletStatus().then(function(res){
    $scope.getWalletRes();
}, function(error){
    walletService.redirectToErrorPage();
});

}

Testcase

var weburl = {
window:{
    location:{
        href: "xyz.com?a=b"
    }
}
}
console.log(window.location.href);
expect(weburl).toEqual('?weburl=');
expect(walletService.getWalletStatus).toHaveBeenCalled();
expect(walletService.getWalletStatus).toHaveBeenCalledWith(weburl);

Error:

TypeError: undefined is not a constructor (evaluating 'weburl.indexOf('?webUrl=')')