A test may interact with the system under test (SUT) directly (via it's "front door" or public API) or indirectly via it's "back door". We call the stimuli injected by the test into the SUT via its front door direct inputs of the SUT. Direct inputs may be method or function calls to another component or messages sent on a message channel (e.g. MQ or JMS) and the arguments or contents thereof.
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