角茉莉如何测试（）是否返回； 在功能上

Question

I intent to test a function as below:

myFunction(input) {
  if (...) {
    return;
  } else {
    do something
  }
}

How to test the condition is return?

it('should', async(() => {
  spyOn(component, 'myFunction')
  // ????
}));

Thank you

Answer 1

How to test if () return; in a function

You don't using spy to determine the inside of the a function. You spy on arguments and return values. You can use spy on to determine if the function returns undefined (the implicit value for return; ) for a given input.

If you want to know that a particular line return got tested, you need to use coverage reports.

Answer 2

Without actual code it's hard to write a code sample for you to use. If you want to test the return of the function of the if part the logic will be something like this:

1. Manipulate the variables inside the if test so they evaluate to true. This may require the use of spies depending on what's inside the if test.
2. Inside an it block have something like expect(component.myFunction()).toBe(undefined);

Hope that helps.