function test_findMultipleDueDate()
 {
     //Arrange
     $book_name = "Gattica";
     $book_id = 2;
     $test_book = new Book($book_name, $book_id);
     $test_book->save();
     $author_name = "Aristole";
     $author_id2 = 1;
     $test_author = new Author($author_name, $author_id2);
     $test_author->save();
     $author_id = $test_author->getId();
     $book_id = $test_book->getId();
     $due_date = "2015-08-29";
     $id = 3;
     $checkout_patron_id = 1;
     $test_book_list = new BookList($author_id, $book_id, $due_date, $checkout_patron_id, $id);
     $test_book_list->save();
     $due_date2 = "2015-08-27";
     $id2 = 4;
     $checkout_patron_id2 = 2;
     $test_book_list2 = new BookList($author_id, $book_id, $due_date2, $checkout_patron_id2, $id2);
     $test_book_list2->save();
     $due_date3 = "2015-08-27";
     $id3 = 5;
     $checkout_patron_id3 = 3;
     $test_book_list3 = new BookList($author_id, $book_id, $due_date3, $checkout_patron_id3, $id3);
     $test_book_list3->save();
     //Act
     $search_id = $test_book_list2->getDueDate();
     $column_id = "due_date";
     $result = BookList::find($column_id, $search_id);
     //Assert
     $this->assertEquals([$test_book_list2, $test_book_list3], $result);
 }