cmocka  1.1.5
Unit testing library with mock support
Standard Assertions
Collaboration diagram for Standard Assertions:


void mock_assert (const int result, const char *const expression, const char *const file, const int line)
 Function to replace assert(3) in tested code. More...
void expect_assert_failure (function fn_call)
 Ensure that mock_assert() is called. More...

Detailed Description

How to handle assert(3) of the standard C library.

Runtime assert macros like the standard C library's assert() should be redefined in modules being tested to use cmocka's mock_assert() function. Normally mock_assert() signals a test failure. If a function is called using the expect_assert_failure() macro, any calls to mock_assert() within the function will result in the execution of the test. If no calls to mock_assert() occur during the function called via expect_assert_failure() a test failure is signalled.

Function Documentation

◆ expect_assert_failure()

void expect_assert_failure ( function  fn_call)

Ensure that mock_assert() is called.

If mock_assert() is called the assert expression string is returned.

[in]fn_callThe function will will call mock_assert().
#define assert mock_assert
void showmessage(const char *message) {
int main(int argc, const char* argv[]) {
return 0;

◆ mock_assert()

void mock_assert ( const int  result,
const char *const  expression,
const char *const  file,
const int  line 

Function to replace assert(3) in tested code.

In conjuction with check_assert() it's possible to determine whether an assert condition has failed without stopping a test.

[in]resultThe expression to assert.
[in]expressionThe expression as string.
[in]fileThe file mock_assert() is called.
[in]lineThe line mock_assert() is called.
extern void mock_assert(const int result, const char* const expression,
const char * const file, const int line);
#undef assert
#define assert(expression) \
mock_assert((int)(expression), #expression, __FILE__, __LINE__);
void increment_value(int * const value) {
(*value) ++;
See also