test: define UNUSED macro only once

The macro `UNUSED` is widely used across the suite
`tarantool-c-tests`. The patch defines macro only once in
`test.h` to reuse it in other tests and removes definitions in
tests.

Reviewed-by: Sergey Kaplun <[email protected]>
Signed-off-by: Sergey Kaplun <[email protected]>
(cherry picked from commit 1ca1736)

Author: ligurio

test/tarantool-c-tests/fix-yield-c-hook.test.c

@@ -3,8 +3,6 @@
 #include "test.h"
 #include "utils.h"
 
-#define UNUSED(x) ((void)(x))
-
 /*
  * This test demonstrates LuaJIT's incorrect behaviour, when
  * calling `lua_yield()` inside a C hook.

test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c

@@ -46,8 +46,6 @@
  * * https://github.com/tarantool/tarantool/issues/9387
  */
 
-#define UNUSED(x) ((void)(x))
-
 #define MESSAGE "Canary is alive"
 #define LUACALL "local a = tostring('" MESSAGE "') return a"
 

test/tarantool-c-tests/lj-1168-unmarked-finalizer-tab.test.c

@@ -3,8 +3,6 @@
 
 #include "test.h"
 
-#define UNUSED(x) ((void)(x))
-
 /*
  * This test demonstrates LuaJIT's incorrect behaviour on
  * loading Lua chunk with cdata numbers.

test/tarantool-c-tests/lj-549-lua-load.test.c

@@ -3,8 +3,6 @@
 
 #include "lj_def.h"
 
-#define UNUSED(x) ((void)(x))
-
 /*
  * XXX: In C language, objects with static storage duration have
  * to be initialized with constant expressions or with aggregate

test/tarantool-c-tests/misclib-sysprof-capi.test.c

@@ -18,8 +18,6 @@
 /* Need for skipcond for OS and ARCH. */
 #include "lj_arch.h"
 
-#define UNUSED(x) ((void)(x))
-
 /* --- utils -------------------------------------------------- */
 
 #define SYSPROF_INTERVAL_DEFAULT 100

test/tarantool-c-tests/test.h

@@ -4,6 +4,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#ifndef UNUSED
+#define UNUSED(x) ((void)(x))
+#endif
+
 /*
  * Test module, based on TAP 14 specification [1].
  * [1]: https://testanything.org/tap-version-14-specification.html

test/tarantool-c-tests/unit-tap.test.c

@@ -1,7 +1,5 @@
 #include "test.h"
 
-#define UNUSED(x) ((void)(x))
-
 static int test_ok(void *test_state)
 {
 	UNUSED(test_state);