tests: ensure output dependent IVI tests run

There are IVI tests that require an output. Previously these tests would
silently skip if no outputs were present. However, a test setup should
always have outputs with these tests. Skipping could easily leave the
tests dead without notice.

Make these tests fail instead of skip if there are no outputs.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

tests/ivi_layout-internal-test.c

@@ -501,7 +501,7 @@ test_screen_render_order(struct test_context *ctx)
 	int32_t length = 0;
 	uint32_t i;
 
-	if (wl_list_empty(&ctx->compositor->output_list))
+	if (!iassert(!wl_list_empty(&ctx->compositor->output_list)))
 		return;
 
 	output = wl_container_of(ctx->compositor->output_list.next, output, link);
@@ -547,7 +547,7 @@ test_screen_bad_render_order(struct test_context *ctx)
 	int32_t length = 0;
 	uint32_t i;
 
-	if (wl_list_empty(&ctx->compositor->output_list))
+	if (!iassert(!wl_list_empty(&ctx->compositor->output_list)))
 		return;
 
 	output = wl_container_of(ctx->compositor->output_list.next, output, link);
@@ -580,7 +580,7 @@ test_screen_add_layers(struct test_context *ctx)
 	int32_t length = 0;
 	uint32_t i;
 
-	if (wl_list_empty(&ctx->compositor->output_list))
+	if (!iassert(!wl_list_empty(&ctx->compositor->output_list)))
 		return;
 
 	output = wl_container_of(ctx->compositor->output_list.next, output, link);
@@ -699,7 +699,7 @@ test_commit_changes_after_render_order_set_layer_destroy(
 	struct ivi_layout_layer *ivilayers[LAYER_NUM] = {};
 	uint32_t i;
 
-	if (wl_list_empty(&ctx->compositor->output_list))
+	if (!iassert(!wl_list_empty(&ctx->compositor->output_list)))
 		return;
 
 	output = wl_container_of(ctx->compositor->output_list.next, output, link);