So the part in your test that is highlighted in yellow is the part that is untested. In this statement: (coffeeList || []) you have no test code that triggers the 2nd half of that statement to return []. This will happen when coffeeList is null or undefined

Here's an example:

function run(input){
  const result = input || 'default';
  console.log(input, result);
}

run('foo');
run(null);
run();

To get your code coverage to 100% you need to write a test that triggers that part of the code.

Possibly something like this. This is just to give you an idea, it might not be 100% functional code here

it('should return an empty array when the coffee list is empty', () => {
  
  //Create a copy of the data
  const mockStateWithEmptyList = {...CoffeeStateMock};
  //Replace the list with nothing
  mockStateWithEmptyList.coffeeList = undefined;
  
  const result = getSelectedCoffee({
    'coffeeState': mockStateWithEmptyList 
  });

  expect(result).toEqual([])
});