tests/cogl: Migrate alpha test test

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2555>

cogl/tests/conform/meson.build

@@ -1,6 +1,5 @@
 cogl_test_conformance_sources = [
   'test-conform-main.c',
-  'test-alpha-test.c',
   'test-map-buffer-range.c',
   'test-npot-texture.c',
   'test-alpha-textures.c',

cogl/tests/conform/test-conform-main.c

@@ -77,8 +77,6 @@ main (int argc, char **argv)
             TEST_REQUIREMENT_GL,
             0);
 
-  ADD_TEST (test_alpha_test, 0, 0);
-
   ADD_TEST (test_map_buffer_range, TEST_REQUIREMENT_MAP_WRITE, 0);
 
   ADD_TEST (test_primitive_and_journal, 0, 0);

cogl/tests/conform/test-declarations.h

@@ -9,7 +9,6 @@ void test_npot_texture (void);
 void test_texture_get_set_data (void);
 void test_alpha_textures (void);
 void test_framebuffer_get_bits (void);
-void test_alpha_test (void);
 void test_map_buffer_range (void);
 void test_primitive_and_journal (void);
 void test_copy_replace_texture (void);

src/tests/cogl/conform/meson.build

@@ -26,6 +26,7 @@ cogl_tests = [
   [ 'test-point-sprite-known-failure', ['gl', 'gl3', 'gles2'] ],
   [ 'test-no-gl-header', [] ],
   [ 'test-layer-remove', [] ],
+  [ 'test-alpha-test', [] ],
 ]
 
 cogl_test_conformance_includes = [

src/tests/cogl/conform/test-alpha-test.c

@@ -1,8 +1,7 @@
 #include <cogl/cogl.h>
 #include <string.h>
 
-#include "test-declarations.h"
-#include "test-utils.h"
+#include "tests/cogl-test-utils.h"
 
 static CoglTexture2D *
 create_texture (CoglContext *context)
@@ -21,7 +20,7 @@ create_texture (CoglContext *context)
                                         NULL /* error */);
 }
 
-void
+static void
 test_alpha_test (void)
 {
   CoglTexture *tex = create_texture (test_ctx);
@@ -72,3 +71,6 @@ test_alpha_test (void)
     g_print ("OK\n");
 }
 
+COGL_TEST_SUITE (
+  g_test_add_func ("/alpha-test", test_alpha_test);
+)