Partial mock `this` in a mimick function is not the mock's `this`

Steps to Repro:

• Create an interface:*

export interface Client {

    authorize(correlationId: string): Promise<string>;

    sendBuyerData(buyerId:string, correlationId: string): Promise<void>;

}

*Mock the authorize method:

 const partialClient = Substitute.for<Client>();
 partialClient.sendBuyerData(Arg.all()).mimicks(client.sendBuyerData);
 partialClient.authorize(Arg.any()).returns(Promise.resolve(uuid()));

Test:

 public async sendBuyerData(buyerId: string, correlationId: string): Promise<void> {

        const token = await this.authorize(correlationId);
        //etc 

Expected:

This is the mock’s this.

Actual:

This points to the function. A class’s methods can’t call other methods.

[jasperblues]

OK, let’s establish the problem with an example first. Stay tuned . . (it might take a few days, under the hammer here a bit, a the moment).

[ffMathy]

Closing until I hear more. Looking forward to it ❤️