C/AL test functions on test codeunits. A test codeunit is a codeunit that has the SubType Property (Codeunit) set to Test.

The TransactionModel property applies to both test functions that use TestPages and test functions that do not use TestPages.

To create meaningful tests, you must first understand how transactions run. In a typical user scenario, a user who is logged on to a client enters data into one field of a page. Then the user enters some data in another field on the page. The user also checks the value of a third field. Finally, the user saves and closes the page. Every time a user enters data into a field, C/AL code may be triggered and a new transaction is automatically started. The trigger code runs within this new transaction. Field data is sent to the server where it is processed and often updated in the database. When the C/AL code in the trigger is finished, the transaction is automatically committed to the database and the page is refreshed with updated data.

When you create test functions that exercise pages that interact with the database, you have the following options for simulating user scenarios and then returning the database to its initial, well-known state:

• Set the TransactionModel property on the test function to AutoRollback. This assumes that the code that you test does not include calls to the COMMIT function. Any calls to the COMMIT function give you an error. Most business logic does not call the COMMIT function, but relies on implicit commits at the end of the outermost C/AL trigger. The test proceeds as follows:
  
  1. The test function starts a transaction.
     
  2. The test function initializes data in the database. Database changes are made in the transaction that was started by the test function.
     
  3. Fields on the test page are set or updated. Database changes are made in the transaction that was started by the test function.
     
  4. The test function reads the values of fields on the test page or reads from the database to validate the test.
     
  5. After the test function is completed, the transaction is rolled back and the database is returned to its initial state.
     
• If the code that you test includes calls to the COMMIT function, then set the TransactionModel property on the test function to AutoCommit. The test proceeds as follows:
  
  1. The test function starts a transaction.
     
  2. The test function initializes data in the database. Database changes are made in the transaction that was started by the test function.
     
  3. Fields on the test page are set or updated. Database changes are made in the transaction that was started by the test function.
     
  4. When the COMMIT function is called, changes are committed to the database.
     
  5. The test function reads the values of fields on the test page or reads from the database to validate the test.
     
  6. After the test function is completed, changes are committed to the database. To return the database to its initial state, either you must manually revert the changes by deleting, updating, or inserting records, or you must use the TestIsolation Property on the test runner codeunit to roll back changes.
     
• Set the TransactionModel property on the test function to None to simulate the behavior of an actual user. The test function does not start a transaction and cannot write to the database. However, a new transaction is started every time that a field on the page is updated and C/AL code is triggered. At the end of each trigger, changes are automatically committed to the database. You can use this option if your test does not write to the database and you do not have to initialize data in the database before the test starts. For example, use this option for tests that validate calculation formulas or tests that read from the database. The test proceeds as follows:
  
  1. If a field on the test page is set or updated and C/AL code is triggered, then the test page starts a transaction. At the end of the trigger, changes are committed to the database.
     
  2. The test function validates the test.
     
  3. After the test is completed, no transactions are rolled back. To return the database to its initial state, either you must manually revert the changes by deleting, updating, or inserting records, or you must use the TestIsolation Property on the test runner codeunit to roll back changes.
     

With AutoCommit and AutoRollback, the test function starts a write transaction. Triggers that are invoked by the test code inherit this open transaction instead of running in their own separate transactions. By using the AutoCommit and AutoRollback settings, if several page interactions are invoked from test code, then they share the same transaction. By using the None setting, each page interaction runs in a separate transaction.

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