system testing: add a unit test to verify that the manual AccessibilityRole mapping is always complete

The enum is non-exhaustive, but we can do an additional run-time check.

Author: tronical

internal/backends/testing/Cargo.toml

@@ -39,3 +39,4 @@ pb-rs = { version = "0.10.0", optional = true, default-features = false }
 [dev-dependencies]
 slint = { workspace = true, default-features = false, features = ["std", "compat-1-2"] }
 i-slint-core-macros = { workspace = true }
+strum = { workspace = true }

internal/backends/testing/systest.rs

@@ -213,7 +213,8 @@ impl TestingClient {
             accessible_checkable: element.accessible_checkable().unwrap_or_default(),
             size: send_logical_size(element.size()).into(),
             absolute_position: send_logical_position(element.absolute_position()).into(),
-            accessible_role: convert_accessible_role(element.accessible_role().unwrap()),
+            accessible_role: convert_accessible_role(element.accessible_role().unwrap())
+                .unwrap_or_default(),
         })
     }
 
@@ -340,8 +341,10 @@ fn send_logical_position(pos: i_slint_core::api::LogicalPosition) -> proto::Logi
     proto::LogicalPosition { x: pos.x, y: pos.y }
 }
 
-fn convert_accessible_role(role: i_slint_core::items::AccessibleRole) -> proto::AccessibleRole {
-    match role {
+fn convert_accessible_role(
+    role: i_slint_core::items::AccessibleRole,
+) -> Option<proto::AccessibleRole> {
+    Some(match role {
         i_slint_core::items::AccessibleRole::None => proto::AccessibleRole::Unknown,
         i_slint_core::items::AccessibleRole::Button => proto::AccessibleRole::Button,
         i_slint_core::items::AccessibleRole::Checkbox => proto::AccessibleRole::Checkbox,
@@ -359,6 +362,14 @@ fn convert_accessible_role(role: i_slint_core::items::AccessibleRole) -> proto::
         }
         i_slint_core::items::AccessibleRole::TextInput => proto::AccessibleRole::TextInput,
         i_slint_core::items::AccessibleRole::Switch => proto::AccessibleRole::Switch,
-        _ => proto::AccessibleRole::Unknown,
+        _ => return None,
+    })
+}
+
+#[test]
+fn test_accessibility_role_mapping_complete() {
+    use strum::IntoEnumIterator;
+    for role in i_slint_core::items::AccessibleRole::iter() {
+        assert!(convert_accessible_role(role).is_some());
     }
 }

internal/core/items.rs

@@ -1467,7 +1467,7 @@ declare_item_vtable! {
 macro_rules! declare_enums {
     ($( $(#[$enum_doc:meta])* enum $Name:ident { $( $(#[$value_doc:meta])* $Value:ident,)* })*) => {
         $(
-            #[derive(Copy, Clone, Debug, PartialEq, Eq, strum::EnumString, strum::Display, Hash)]
+            #[derive(Copy, Clone, Debug, PartialEq, Eq, strum::EnumString, strum::Display, strum::EnumIter, Hash)]
             #[repr(u32)]
             #[strum(serialize_all = "kebab-case")]
             $(#[$enum_doc])*