tests: Move ARRAY_LENGTH to a shared header for reuse

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Marek Chalupa <mchqwerty@gmail.com>

tests/presentation-test.c

@@ -31,8 +31,6 @@
 #include "weston-test-client-helper.h"
 #include "presentation_timing-client-protocol.h"
 
-#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
-
 static inline void *
 xzalloc(size_t size)
 {

tests/weston-test-runner.h

@@ -41,6 +41,8 @@ struct weston_test {
 	int must_fail;
 } __attribute__ ((aligned (32)));
 
+#define ARRAY_LENGTH(a) ((int) (sizeof (a) / sizeof (a)[0]))
+
 #define TEST_BEGIN(name, arg)					\
 	static void name(arg)
 
@@ -67,7 +69,7 @@ struct weston_test {
 #define ARG_TEST(name, ret, test_data)				\
 	TEST_COMMON(name, name, ret, test_data,			\
 		    sizeof(test_data[0]),			\
-		    sizeof(test_data) / sizeof (test_data[0]))	\
+		    ARRAY_LENGTH(test_data))			\
 	TEST_BEGIN(name, void *data)				\
 
 #define TEST(name) NO_ARG_TEST(name, 0)