Mocking CFCs in TestBox: How to Isolate and Unit Test ColdFusion Business Logic

Mocking is how you unit-test a ColdFusion component’s business logic in isolation — without its real dependencies (database, email, HTTP, payment gateway) actually running. TestBox includes MockBox, a stubbing and mocking framework that replaces a CFC’s collaborators with fakes you control, so a test exercises only the logic you’re testing. You create a fake with createMock() (wrap an object for mocking/spying), createEmptyMock() (remove all methods so you only mock what you need), or createStub() (a blank object from scratch); you program its behavior with $( "methodName", returnValue ) (make a method return something), $args() (return based on specific arguments), $results() (return a sequence across calls), and $throws() (simulate a failure); you inject it into the component under test with $property(); and you verify interactions with $times() / $verifyCallCount(), $once(), $never(), and $atLeast(). The result: a test that runs in milliseconds, hits no real database, sends no real email, and can simulate any success or failure case — testing your logic, not your dependencies. This guide covers the full MockBox API with working examples.
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