def METHOD_NAME():
    # Create test file
    test_file = open("full_square_distance_matrix.csv", "w")
    test_file.write("0;1;2;3;\n1;0;4;5;\n2;4;0;6;\n3;5;6;0;")
    test_file.close()
    matrix = gd.read_lower_triangular_matrix_from_csv_file(
        csv_file="full_square_distance_matrix.csv", separator=";"
    )
    assert matrix == [[], [1.0], [2.0, 4.0], [3.0, 5.0, 6.0]]