Currently, I am in the process of writing a test case for one of my functions. This function calls another function from a library, and I am attempting to mock this function (saveCall). Below is a snippet of the sample code in question:
import { Call } from './somefolder/call';
class Demo {
var testIt = (params: any) => {
---- // Some other code
let call = new Call(params);
call.saveCall();
---- // Some other code
}
return {testIt: testIt};
}
Furthermore, here is my approach to writing a unit test case for the function:
import { Call } from './somefolder/call';
var demo = new Demo();
test("Test it", () => {
let call = new Call({} as any);
let spyIt = jest.spyOn(call, 'saveCall').mockImplementation(()=>{console.log('here')});
demo.testIt();
expect(spyIt).toHaveBeenCalled(); // Throws error expect(jest.fn()).toHaveBeenCalled()
});
Currently, I am encountering an error with the
expect(jest.fn()).toHaveBeenCalled()Given this situation, my query is how can I effectively create a mock and verify whether saveCall() has been called without altering the implementation of the testIt function.