Added an event for cancel_proposal (#11620)

* Added an event for cancel_proposal

* test

substrate/frame/democracy/src/lib.rs

@@ -537,6 +537,8 @@ pub mod pallet {
 		Voted { voter: T::AccountId, ref_index: ReferendumIndex, vote: AccountVote<BalanceOf<T>> },
 		/// An account has secconded a proposal
 		Seconded { seconder: T::AccountId, prop_index: PropIndex },
+		/// A proposal got canceled.
+		ProposalCanceled { prop_index: PropIndex },
 	}
 
 	#[pallet::error]
@@ -1277,6 +1279,7 @@ pub mod pallet {
 				}
 			}
 
+			Self::deposit_event(Event::<T>::ProposalCanceled { prop_index });
 			Ok(())
 		}
 	}

substrate/frame/democracy/src/tests/public_proposals.rs

@@ -96,11 +96,11 @@ fn invalid_seconds_upper_bound_should_not_work() {
 #[test]
 fn cancel_proposal_should_work() {
 	new_test_ext().execute_with(|| {
-		System::set_block_number(0);
 		assert_ok!(propose_set_balance_and_note(1, 2, 2));
 		assert_ok!(propose_set_balance_and_note(1, 4, 4));
 		assert_noop!(Democracy::cancel_proposal(Origin::signed(1), 0), BadOrigin);
 		assert_ok!(Democracy::cancel_proposal(Origin::root(), 0));
+		System::assert_last_event(crate::Event::ProposalCanceled { prop_index: 0 }.into());
 		assert_eq!(Democracy::backing_for(0), None);
 		assert_eq!(Democracy::backing_for(1), Some(4));
 	});