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Added simple explanation and example to readme file

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mj
2016-12-18 15:19:08 +01:00
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README.md
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@@ -448,6 +448,32 @@ TEST_F(FFFTestSuite, test_fake_with_function_pointer)
/* and ofcourse our custom fake correctly calls the registered callback */
ASSERT_EQ(cb_timeout_called, 1);
}
```
## How do I reuse a fake across multiple test-suites?
FFF functions like FAKE_VALUE_FUNC will perform both the declaration AND the definition of the fake function and the corresponding data structs. This cannot be placed in a header, since it will lead to multiple definitions of the fake functions.
The solution is to separate declaration and definition of the fakes, and place the declaration into a public header file, and the definition into a private source file.
Here is an example of how it could be done:
```
/* Public header file */
#include "fff.h"
DECLARE_FAKE_VALUE_FUNC(int, value_function, int, int);
DECLARE_FAKE_VOID_FUNC(void_function, int, int);
DECLARE_FAKE_VALUE_FUNC_VARARG(int, value_function_vargs, const char *, int, ...);
DECLARE_FAKE_VOID_FUNC_VARARG(void_function_vargs, const char *, int, ...);
/* Private source file file */
#include "public_header.h"
DEFINE_FAKE_VALUE_FUNC(int, value_function, int, int);
DEFINE_FAKE_VOID_FUNC(void_function, int, int);
DEFINE_FAKE_VALUE_FUNC_VARARG(int, value_function_vargs, const char *, int, ...);
DEFINE_FAKE_VOID_FUNC_VARARG(void_function_vargs, const char *, int, ...);
```
## Find out more...