diff --git a/Cargo.lock b/Cargo.lock
index 2e3ce8e0ec89b8b0e4c8cdf1c353c6e5fb494362..b66692b9c7ed568cfce67bc249cd46ebb591714a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3234,6 +3234,7 @@ dependencies = [
  "sp-offchain",
  "sp-runtime",
  "sp-session",
+ "sp-staking",
  "sp-std 5.0.0",
  "sp-transaction-pool",
  "sp-version",
diff --git a/runtime/gdev/Cargo.toml b/runtime/gdev/Cargo.toml
index 680b3da3491563def2a8dae615a094ff52fc3c3a..976999d23464736b73a55792f68b3feef4b686d4 100644
--- a/runtime/gdev/Cargo.toml
+++ b/runtime/gdev/Cargo.toml
@@ -135,6 +135,7 @@ try-runtime = [
 [dev-dependencies]
 sp-io = { git = 'https://github.com/duniter/substrate', branch = 'duniter-substrate-v0.9.42', default-features = false }
 sp-keyring = { git = 'https://github.com/duniter/substrate', branch = 'duniter-substrate-v0.9.42', default-features = false }
+sp-staking = { git = 'https://github.com/duniter/substrate', branch = 'duniter-substrate-v0.9.42', default-features = false }
 
 [dependencies]
 # local
diff --git a/runtime/gdev/tests/integration_tests.rs b/runtime/gdev/tests/integration_tests.rs
index fa700844761e49eaa732756378ea805f4f2d9c0e..7b77c3548d9810054a620d97cac5a3b2c869e5e2 100644
--- a/runtime/gdev/tests/integration_tests.rs
+++ b/runtime/gdev/tests/integration_tests.rs
@@ -19,14 +19,21 @@ mod common;
 use common::*;
 use frame_support::instances::Instance1;
 use frame_support::traits::StoredMap;
+use frame_support::traits::ValidatorSet;
+use frame_support::traits::ValidatorSetWithIdentification;
 use frame_support::traits::{Get, PalletInfo, StorageInfo, StorageInfoTrait};
 use frame_support::{assert_noop, assert_ok};
 use frame_support::{StorageHasher, Twox128};
 use gdev_runtime::*;
+use pallet_duniter_wot::IdtyRemovalWotReason;
+use pallet_im_online::UnresponsivenessOffence;
 use pallet_membership::MembershipRemovalReason;
+use pallet_session::historical::IdentificationTuple;
 use sp_core::Encode;
 use sp_keyring::AccountKeyring;
+use sp_runtime::traits::Convert;
 use sp_runtime::MultiAddress;
+use sp_staking::offence::ReportOffence;
 
 #[test]
 fn verify_treasury_account() {
@@ -1306,3 +1313,38 @@ fn smith_data_problem() {
             run_to_block(4);
         });
 }
+#[test]
+fn test_imonline_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 offenders = current_validators
+			.into_iter()
+			.enumerate()
+			.filter_map(|(_, id)| {
+				<<Runtime as pallet_im_online::Config>::ValidatorSet as ValidatorSetWithIdentification<sp_runtime::AccountId32>>::IdentificationOf::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 = UnresponsivenessOffence { session_index, validator_set_count, offenders };
+	let _ = <Runtime as pallet_im_online::Config>::ReportUnresponsiveness::report_offence(vec![], offence);
+		// An offence is deposited
+        System::assert_has_event(RuntimeEvent::Offences(
+            pallet_offences::Event::Offence {
+                kind: *b"im-online:offlin",
+                timeslot: vec![0, 0, 0, 0],
+            },
+        ));
+		// Offenders are punished
+        System::assert_has_event(RuntimeEvent::AuthorityMembers(
+            pallet_authority_members::Event::MemberGoOffline {
+				member: 1
+            },
+        ));
+	})
+}