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This macro redirects function calls made to FUNC to the fake function FAKE. The signature of the fake function must be identical to the original function otherwise the behavior is undefined. Depending upon what compiler extensions are available and the version of the C standard being built against, Audition can error if the signatures do not match.

This function-like macro is intended to be called from the body of a test case or fixture. Invoking it elsewhere will produce a runtime error.

The implementation of the fake function can perform parameter validation and return its own return value. If the only purpose of the fake function is to return a value, then consider using STUB instead.

int foo(void); // forward declaration

static int fake_foo(void) // fake function
{
    return 123; // hard-coded return value
}

/* ... */

FAKE(foo, fake_foo) // redirect foo() to fake_foo()

Fake functions are discussed in detail in Mocking with Fakes.