One or more test controls within code under test are enabled and then executing the code under test is executed. When enabled, the test control will interact with a tester when the code under test is executed (e.g., by providing data to the tester). The selection to enable the test control can be made based on whether the system accessing the code under test is a tester. If the system is a tester, the test control is enabled. Otherwise, the test control is disabled. The test control can include an execution control, a data definition control, and/or a log control.