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Update the docs to demonstrate custom function signatures

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Update the GCC specific example of nested functions to support capturing
lambdas when a custom function signature is used with std::function.

Signed-off-by: Yuval Peress <peress@google.com>
This commit is contained in:
Yuval Peress
2022-08-11 23:12:23 -06:00
parent d254d115e1
commit 3ede05133f
1 changed files with 16 additions and 10 deletions
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26
README.md
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@@ -459,9 +459,17 @@ The basic mechanism that fff provides you in this case is the custom_fake field
You need to create a custom function (e.g. getTime_custom_fake) to produce the output optionally by use of a helper variable (e.g. getTime_custom_now) to retrieve that output from. Then some creativity to tie it all together. The most important part (IMHO) is to keep your test case readable and maintainable.
In case your project uses a C compiler that supports nested functions (e.g. GCC) you can even combine all this in a single unit test function so you can easily oversee all details of the test.
In case your project uses a C compiler that supports nested functions (e.g. GCC), or when using C++ lambdas, you can even combine all this in a single unit test function so you can easily oversee all details of the test.
```c
#include <functional>
/* Configure FFF to use std::function, which enables capturing lambdas */
#define CUSTOM_FFF_FUNCTION_TEMPLATE(RETURN, FUNCNAME, ...) \
std::function<RETURN (__VA_ARGS__)> FUNCNAME
#include "fff.h"
/* The time structure */
typedef struct {
int hour, min;
@@ -474,15 +482,13 @@ FAKE_VOID_FUNC(getTime, Time*);
TEST_F(FFFTestSuite, when_value_custom_fake_called_THEN_it_returns_custom_output)
{
Time t;
Time getTime_custom_now;
void getTime_custom_fake(Time *now) {
*now = getTime_custom_now;
}
getTime_fake.custom_fake = getTime_custom_fake;
/* given a specific time */
getTime_custom_now.hour = 13;
getTime_custom_now.min = 05;
Time getTime_custom_now = {
.hour = 13,
.min = 05,
};
getTime_fake.custom_fake = [getTime_custom_now](Time *now) {
*now = getTime_custom_now;
};
/* when getTime is called */
getTime(&t);