pcmk__realloc_test.c
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pcmk__realloc_test.c
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	/*
	* Copyright 2024 the Pacemaker project contributors
	*
	* The version control history for this file may have further details.
	*
	* This source code is licensed under the GNU General Public License version 2
	* or later (GPLv2+) WITHOUT ANY WARRANTY.
	*/

	#include <crm_internal.h>

	#include <crm/common/unittest_internal.h>

	#include "mock_private.h"

	static void
	bad_size(void **state)
	{
	char *ptr = NULL;

	pcmk__assert_asserts(pcmk__realloc(ptr, 0));
	}

	static void
	realloc_fails(void **state)
	{
	char *ptr = NULL;

	pcmk__assert_aborts(
	{
	pcmk__mock_realloc = true; // realloc() will return NULL
	expect_any(__wrap_realloc, ptr);
	expect_value(__wrap_realloc, size, 1000);
	pcmk__realloc(ptr, 1000);
	pcmk__mock_realloc = false; // Use real realloc()
	}
	);
	}

	static void
	realloc_succeeds(void **state)
	{
	char *ptr = NULL;

	/* We can't really test that the resulting pointer is the size we asked
	* for - it might be larger if that's what the memory allocator decides
	* to do. And anyway, testing realloc isn't really the point. All we
	* want to do here is make sure the function works when given good input.
	*/

	/* Allocate new memory */
	ptr = pcmk__realloc(ptr, 1000);
	assert_non_null(ptr);

	/* Grow previously allocated memory */
	ptr = pcmk__realloc(ptr, 2000);
	assert_non_null(ptr);

	/* Shrink previously allocated memory */
	ptr = pcmk__realloc(ptr, 500);
	assert_non_null(ptr);

	free(ptr);
	}

	PCMK__UNIT_TEST(NULL, NULL,
	cmocka_unit_test(bad_size),
	cmocka_unit_test(realloc_fails),
	cmocka_unit_test(realloc_succeeds))