test: image: check that encoder opened

The test can pass if a different encoder is used during the test, but we
need to ensure it's really the encoder from the test.

This was catched when changing the capability from video encoder into
image encoder, which led the test to use the png encoder instead.

Author: alexandre-janniaux

test/src/misc/image.c

@@ -44,6 +44,8 @@ const char vlc_module_name[] = MODULE_STRING;
 
 #include <limits.h>
 
+static atomic_bool encoder_opened = false;
+
 static int OpenIntf(vlc_object_t *root)
 {
     image_handler_t *ih = image_HandlerCreate(root);
@@ -68,15 +70,18 @@ static int OpenIntf(vlc_object_t *root)
     assert(block != NULL);
     block_Release(block);
     picture_Release(picture);
+    assert(atomic_load(&encoder_opened));
+    atomic_store(&encoder_opened, false);
 
     picture = picture_NewFromFormat(&fmt_in);
     fmt_out.i_width = fmt_out.i_visible_width = 400;
     fmt_out.i_height = fmt_out.i_visible_height = 300;
     block = image_Write(ih, picture, &fmt_in, &fmt_out);
     assert(block != NULL);
-
     block_Release(block);
     picture_Release(picture);
+    assert(atomic_load(&encoder_opened));
+
     image_HandlerDelete(ih);
 
     return VLC_SUCCESS;
@@ -98,6 +103,7 @@ static int OpenEncoder(vlc_object_t *obj)
         .encode_video = EncodeVideo
     };
     encoder->ops = &ops;
+    atomic_store(&encoder_opened, true);
     return VLC_SUCCESS;
 }