Tighten Pi signage HDMI settle coverage

apps/fc-signage-pi-player/tests/display_capability.bats

@@ -0,0 +1,22 @@
+#!/usr/bin/env bats
+
+setup() {
+  APP_ROOT="$(cd "$BATS_TEST_DIRNAME/.." && pwd)"
+  DETECT="$APP_ROOT/scripts/fc-signage-detect-display"
+}
+
+@test "display detection emits graceful disconnected profile when no hdmi connector is present" {
+  script="$(cat "$DETECT")"
+  [[ "$script" == *"displayConnected: false"* ]]
+  [[ "$script" == *"No HDMI display detected"* ]]
+}
+
+@test "display detection parses edid, falls back to kmsprint, and logs endpoint failures locally" {
+  script="$(cat "$DETECT")"
+  [[ "$script" == *"edid-decode"* ]]
+  [[ "$script" == *"HDR (Static|Dynamic) Metadata Block"* ]]
+  [[ "$script" == *"kmsprint"* ]]
+  [[ "$script" == *"/api/v1/nodes/\${NODE_ID}/capabilities"* ]]
+  [[ "$script" == *"/api/v1/displays/\${NODE_ID}/capability-profile"* ]]
+  [[ "$script" == *"capabilities.log"* ]]
+}