Unit tests can be activate with configure --enable-unittests.

Unit tests require extra visibility of symbols. That's why a second build is required. This is done automatically.

At the moment unit tests are executed each time a build occurs. Note: it could happen along with other reformatting and checks in a precommit command.

Include the unit test framework:

#include "tests.h"

If the function is static, replace static with GF_STATIC. Then add a definition in your unit test file:

char *xml_translate_xml_string(char *str);

Then write test functions:

unittest(xml_translate_xml_string)
{
    assert_equal_str(xml_translate_xml_string("&"), "&");
}