add end2end test babe offences

runtime/gdev/tests/integration_tests.rs

@@ -1392,3 +1392,43 @@ fn test_grandpa_offence() {
         ));
     })
 }
+#[test]
+fn test_babe_offence() {
+    ExtBuilder::new(1, 3, 4).build().execute_with(|| {
+        run_to_block(1);
+        let session_index = Session::current_index();
+        let current_validators = <Runtime as pallet_im_online::Config>::ValidatorSet::validators();
+        // Construct an offence where all validators (member: 1) are offenders
+        let mut offenders = current_validators
+            .into_iter()
+            .enumerate()
+            .filter_map(|(_, id)| {
+                <Runtime as pallet_session::historical::Config>::FullIdentificationOf::convert(
+                    id.clone(),
+                )
+                .map(|full_id| (id, full_id))
+            })
+            .collect::<Vec<IdentificationTuple<Runtime>>>();
+        let keys = ImOnline::keys();
+        let validator_set_count = keys.len() as u32;
+        let offence = pallet_babe::EquivocationOffence {
+            slot: 0u64.into(),
+            session_index,
+            validator_set_count,
+            offender: offenders.pop().unwrap().into(),
+        };
+        let _ = Offences::report_offence(vec![], offence);
+        // An offence is deposited
+        System::assert_has_event(RuntimeEvent::Offences(pallet_offences::Event::Offence {
+            kind: *b"babe:equivocatio",
+            timeslot: vec![0, 0, 0, 0, 0, 0, 0, 0],
+        }));
+        // Offenders are punished
+        System::assert_has_event(RuntimeEvent::AuthorityMembers(
+            pallet_authority_members::Event::MemberGoOffline { member: 1 },
+        ));
+        System::assert_has_event(RuntimeEvent::AuthorityMembers(
+            pallet_authority_members::Event::MemberAddedToBlacklist { member: 1 },
+        ));
+    })
+}