How do I cover the test cases for useState hook in React Jest

I have been writing code for a reusable date range picker which lets users set startDate and endDate and comes with an Apply button and dropdown options including ( Today, Tomorrow, This Month, etc ) for filling up the selector automatically .

While the basic functionalities are covered by the test cases written, it shows just 50% of the test cases are covered.

The uncovered line numbers are,

const onStartDateChange = value => {
    setStartAndEndDate(prev, { ...prev, startDate: value });
    setIsButtonDisabled(false);
};

Here, jest --coverage shows the line setStartAndEndDate(... not being covered by the test cases.

A little note is, the onStartDateChange is not coming from the props but resides inside the component itself.

The usage for the component is like,

<DateRangePicker enableTime onApplyClick={onApplyButtonClickMock} />

How do I cover the the function that is called when the date is picked from the calendar or ( from the dropdown ) startDate date picker is