Recently, I've been faced with the challenge of writing a unit test for one of the functions in my component. The specific function in question is called 'setup', which internally calls another function named 'additionalSetup'. In 'additionalSetup', there's a subscription to the store with a pipe(take(1)) method snippet that captures the first emission:
private setup() {
// ...declare/assign variables in the component
this.additionalSetup();
}
private additionalSetup() {
this.store.pipe(take(1)).subscribe(/*actual logic implementation*/);
}
However, running the unit test results in an error message:
TypeError: Cannot read property 'pipe' of undefined
To tackle this issue, I attempted to mock 'additionalSetup' within the 'setup' unit test like so:
component.additionalSetup = jest.fn();
Unfortunately, this approach did not yield the desired outcome. As someone relatively new to jest, I find myself still on a learning curve. What strategies or methods should I consider to address and resolve this particular error?