How to use the pypesto.visualize.create_references function in pypesto

def create_plotting_options():
    # create sets of reference points (from tuple, dict and from list)
    ref1 = ([1., 1.5], 0.2)
    ref2 = ([1.8, 1.9], 0.6)
    ref3 = {'x': np.array([1.4, 1.7]), 'fval': 0.4}
    ref4 = [ref1, ref2]
    ref_point = visualize.create_references(ref4)

    return ref1, ref2, ref3, ref4, ref_point

def test_reference_points():
    # create the necessary results
    (ref1, ref2, ref3, ref4, _) = create_plotting_options()

    # Try conversion from different inputs
    visualize.create_references(ref1)
    visualize.create_references(references=ref2)
    ref_list_1 = visualize.create_references(ref3)
    ref_list_2 = visualize.create_references(ref4)

    # Try to append to a list
    ref_list_2.append(ref_list_1[0])
    ref_list_2 = visualize.create_references(ref_list_2)

    # Try to append one point to a list via the interface
    visualize.create_references(references=ref_list_2,
                                x=ref2[0], fval=ref2[1])

def test_reference_points():
    # create the necessary results
    (ref1, ref2, ref3, ref4, _) = create_plotting_options()

    # Try conversion from different inputs
    visualize.create_references(ref1)
    visualize.create_references(references=ref2)
    ref_list_1 = visualize.create_references(ref3)
    ref_list_2 = visualize.create_references(ref4)

    # Try to append to a list
    ref_list_2.append(ref_list_1[0])
    ref_list_2 = visualize.create_references(ref_list_2)

    # Try to append one point to a list via the interface
    visualize.create_references(references=ref_list_2,
                                x=ref2[0], fval=ref2[1])

def test_reference_points():
    # create the necessary results
    (ref1, ref2, ref3, ref4, _) = create_plotting_options()

    # Try conversion from different inputs
    visualize.create_references(ref1)
    visualize.create_references(references=ref2)
    ref_list_1 = visualize.create_references(ref3)
    ref_list_2 = visualize.create_references(ref4)

    # Try to append to a list
    ref_list_2.append(ref_list_1[0])
    ref_list_2 = visualize.create_references(ref_list_2)

    # Try to append one point to a list via the interface
    visualize.create_references(references=ref_list_2,
                                x=ref2[0], fval=ref2[1])

def test_reference_points():
    # create the necessary results
    (ref1, ref2, ref3, ref4, _) = create_plotting_options()

    # Try conversion from different inputs
    visualize.create_references(ref1)
    visualize.create_references(references=ref2)
    ref_list_1 = visualize.create_references(ref3)
    ref_list_2 = visualize.create_references(ref4)

    # Try to append to a list
    ref_list_2.append(ref_list_1[0])
    ref_list_2 = visualize.create_references(ref_list_2)

    # Try to append one point to a list via the interface
    visualize.create_references(references=ref_list_2,
                                x=ref2[0], fval=ref2[1])