Angular unit test with private variable

I want to write the unit test for the private variable. But Jasmine is not allowing me to use it. Can someone explain me how to do it?

export class TestComponent implements OnInit {
private resolve;

public testPrivate() {
this.resolve(false);
}
}

it(
'should test private variable', () => {
component.testPrivate();
expect(component.resolve).toEqual(false);
});

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