Unify test source files.

test/main/relay_chn_test.c

@@ -72,4 +72,13 @@ TEST_CASE("Relay channels do not change state for invalid channel", "[relay_chn]
     check_channels_state_unchanged();
     relay_chn_flip_direction(relay_chn_count + 1); // Flip the direction
     check_channels_state_unchanged();
-}
+}
+
+
+
+// Test app entry point
+void app_main(void) 
+{
+    // Run the Unity tests menu
+    unity_run_menu();
+}