bindings: Convert certain Exceptions into Promise rejections (#32923)

* Impl promise exception to rejection for methods

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Impl promise exception to rejection for getters

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Impl promise exception to rejection for static methods

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Add tests for exception to rejection

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Expectations

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index 344d41af031..0177a6d89d1 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -1084,6 +1084,29 @@ impl TestBindingMethods for TestBinding {
             stringMember: Some(s2),
         }
     }
+
+    fn MethodThrowToRejectPromise(&self) -> Fallible<Rc<Promise>> {
+        Err(Error::Type("test".to_string()))
+    }
+
+    fn GetGetterThrowToRejectPromise(&self) -> Fallible<Rc<Promise>> {
+        Err(Error::Type("test".to_string()))
+    }
+
+    fn MethodInternalThrowToRejectPromise(&self, _arg: u64) -> Rc<Promise> {
+        unreachable!("Method should already throw")
+    }
+}
+
+#[allow(non_snake_case)]
+impl TestBinding {
+    pub fn StaticThrowToRejectPromise(_: &GlobalScope) -> Fallible<Rc<Promise>> {
+        Err(Error::Type("test".to_string()))
+    }
+
+    pub fn StaticInternalThrowToRejectPromise(_: &GlobalScope, _arg: u64) -> Rc<Promise> {
+        unreachable!("Method should already throw")
+    }
 }
 
 #[allow(non_snake_case)]