[PATCH i-g-t v4] tests/kms_plane_alpha_blend: Skip test when no display is connected

[sumit kishore <sumit.kishore@intel.com>]

From: Sumit Kishore <sumit.kishore@intel.com>

Add igt_display_require_output() to skip the test on headless systems
with no active display connected.

v2: Add igt_display_require_output. [Karthik]
v3: Update subject and description. [Swati]
v4: Updated the author name. [Sowmiya]

Signed-off-by: Sumit Kishore <sumit.kishore@intel.com>
---
 tests/kms_plane_alpha_blend.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/kms_plane_alpha_blend.c b/tests/kms_plane_alpha_blend.c
index 3a67dd8cd..3a2649833 100644
--- a/tests/kms_plane_alpha_blend.c
+++ b/tests/kms_plane_alpha_blend.c
@@ -764,6 +764,9 @@ int igt_main_args("e", NULL, help_str, opt_handler, NULL)
 		igt_display_require(&data.display, data.gfx_fd);
 		igt_require(data.display.is_atomic);
 
+		/* Check if at least one active display connected */
+		igt_display_require_output(&data.display);
+
 		/* Get active pipes. */
 		for_each_crtc(&data.display, crtc)
 			active_crtcs[last_crtc_index++] = crtc->crtc_index;
-- 
2.43.0