I like to unit test CRUD (Create, Read, Update, Delete) operations for my domain objects as well as find all. I use the same template again and again, it's quick to do and makes sure that the basic operations work. Here is what I do :
- A first find all to get all the objects from the database
- Create an object with random values and persist it into the database
- Find the created object from the database
- Make sure it exists
- Make sure it has the right random values
- Update the created object with other random values into the database
- Find the updated object from the database
- Make sure it still exists
- Make sure it has the new random values
- A second find all makes sure that there is one more object in the database
- Delete the object from the database
- Find the object from the database
- Make sure it doesn't exist
- A third find all makes sure that there is the initial number of objects in the database
Here is the (simplified) JUnit code that tests the CRUD operations for an Item.
@Test public void testCRUD() throws Exception { // Gets two random numbers Long random = getRandom(); Long updateRandom = getRandom(); // Item is the domain object Item item = new Item(); // The method findAll brings back all the objects from the DB int firstFindAll = findAll(); // Item gets mock values and is persisted. Id is returned item = getMockItemValues(item, random); persist(item); Long id = item.getId(); // Find the created object with the given Id and makes sure it has the right values item = find(id); assertNotNull("Object should exist", item); checkMockItemValues(item, random); // Updates the object with new random values item = getMockItemValues(item, updateRandom); merge(item); // Find the updated object and makes sure it has the new values item = em.find(Item.class, id); assertNotNull("Object should exist", item); checkMockItemValues(item, updateRandom); // Gets all the objects from the database… int secondFindAll = findAll(); // ...and makes sure there is one more object if (firstFindAll + 1 != secondFindAll) fail("The collection size should have increased by 1"); // The object is now deleted remove(item); // Find the object and make sure it has been removed item = em.find(Item.class, id); assertNull("Object should not exist", item); // Gets all the objects from the database… int thirdFindAll = findAll(); // ...and makes sure we have the original size if (firstFindAll != thirdFindAll) fail("The collection size should have be the same as original"); }
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