diff --git a/core/integration_tests_core/Cargo.toml b/core/integration_tests_core/Cargo.toml
index 0f4bde8..8a5cabf 100644
--- a/core/integration_tests_core/Cargo.toml
+++ b/core/integration_tests_core/Cargo.toml
@@ -6,13 +6,22 @@ edition = "2024"
 # [[test]]
 # name = "integration_tests_core"
 
-[dev-dependencies]
+[dependencies]
 # Workspace dependencies (sorted)
 chat-sqlite = { workspace = true }
 components = { workspace = true }
 libchat = { workspace = true }
-logos-account = { workspace = true , features = ["dev"]}
+logos-account = { workspace = true, features = ["dev"]}
+shared-traits = { workspace = true }
+
+# External dependencies (sorted)
+tracing = "0.1"
+
+[dev-dependencies]
+chat-sqlite = { workspace = true }
 storage = { workspace = true }
 
 # External dependencies (sorted)
 tempfile = "3"
+tracing = "0.1.44"
+tracing-subscriber = "0.3"
diff --git a/core/integration_tests_core/src/lib.rs b/core/integration_tests_core/src/lib.rs
index 8b13789..0c2e590 100644
--- a/core/integration_tests_core/src/lib.rs
+++ b/core/integration_tests_core/src/lib.rs
@@ -1 +1,4 @@
+mod test_client;
+mod wakeup;
 
+pub use test_client::TestHarness;
diff --git a/core/integration_tests_core/src/test_client.rs b/core/integration_tests_core/src/test_client.rs
new file mode 100644
index 0000000..62b7d8f
--- /dev/null
+++ b/core/integration_tests_core/src/test_client.rs
@@ -0,0 +1,333 @@
+use libchat::{ConversationId, Core, IdentityProvider, PayloadOutcome};
+use logos_account::TestLogosAccount;
+use shared_traits::IdentId;
+use std::collections::HashMap;
+use std::fmt::Debug;
+use std::ops::{Deref, DerefMut};
+use std::time::Duration;
+use tracing::{info, warn};
+
+use components::{EphemeralRegistry, LocalBroadcaster, MemStore};
+
+use crate::wakeup::{TestWakeupProvider, TestWakeupService, WakeupRecord};
+
+type WS = TestWakeupService;
+type WP = TestWakeupProvider;
+
+const SARO: usize = 0;
+const RAYA: usize = 1;
+const PAX: usize = 2;
+const MIRA: usize = 3;
+
+// type ClientType = CoreClient<TestLogosAccount, LocalBroadcaster, EphemeralRegistry, WP, MemStore>;
+type ClientType = Core<(
+    TestLogosAccount,
+    LocalBroadcaster,
+    EphemeralRegistry,
+    WP,
+    MemStore,
+)>;
+
+#[derive(Debug)]
+pub struct ReceivedMessage<T> {
+    pub convo_id: ConversationId,
+    pub contents: T,
+}
+
+pub struct TestClient {
+    inner: ClientType,
+    received_messages: Vec<ReceivedMessage<Vec<u8>>>,
+}
+
+impl TestClient {
+    fn init(client: ClientType) -> Self {
+        Self {
+            inner: client,
+            received_messages: vec![],
+        }
+    }
+
+    pub fn addr(&self) -> IdentId {
+        self.inner.ident_id().clone()
+    }
+
+    fn drain_outcomes(&mut self) -> Vec<PayloadOutcome> {
+        let mut messages = vec![];
+        while let Some(data) = self.inner.ds().poll() {
+            messages.push(data);
+        }
+
+        let mut outcomes = vec![];
+        for data in messages {
+            let outcome = self.inner.handle_payload(&data).unwrap();
+            warn!(id= ?self.ident_id(),?outcome, "DRAIN CLIENT");
+            // Copy Convo Messages to received buffer
+
+            match &outcome {
+                PayloadOutcome::Empty => continue,
+                PayloadOutcome::Convo(convo_outcome) => {
+                    if let Some(data) = &convo_outcome.content {
+                        info!(
+                            content = String::from_utf8_lossy(&data.bytes).to_string(),
+                            "COT"
+                        );
+                        self.received_messages.push(ReceivedMessage {
+                            convo_id: convo_outcome.convo_id.clone(),
+                            contents: data.bytes.clone(),
+                        });
+                    }
+                }
+                PayloadOutcome::Inbox(_) => {}
+            }
+
+            if !matches!(outcome, PayloadOutcome::Empty) {
+                outcomes.push(outcome);
+            }
+        }
+        outcomes
+    }
+
+    pub fn received_messages(&self) -> &[ReceivedMessage<Vec<u8>>] {
+        &self.received_messages
+    }
+
+    pub fn check(&self, convo_id: &str, content: &[u8]) -> bool {
+        for msg in &self.received_messages {
+            if msg.convo_id == convo_id && msg.contents == content {
+                return true;
+            }
+        }
+        false
+    }
+
+    pub fn convo_count(&self) -> usize {
+        self.list_conversations().map_or(0, |v| v.len())
+    }
+}
+
+impl Deref for TestClient {
+    type Target = ClientType;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl DerefMut for TestClient {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.inner
+    }
+}
+
+#[allow(unused)]
+pub struct Observation {
+    ident: IdentId,
+    outcome: PayloadOutcome,
+}
+
+#[allow(unused)]
+pub struct TestHarness<const N: usize> {
+    addresses: HashMap<usize, IdentId>,
+    clients: Vec<TestClient>,
+    wakeup_service: WS,
+    cb: Box<dyn Fn(&TestClient, PayloadOutcome)>,
+    // List of outcomes that were detected across all clients.
+    pub observed_outcomes: Vec<Observation>,
+}
+
+impl<const N: usize> TestHarness<N> {
+    pub fn new(cb: impl Fn(&TestClient, PayloadOutcome) + 'static) -> Self {
+        const { assert!(N > 0, "TestHarness requires at least one client") };
+        const { assert!(N <= 4, "Only 4 clients are supported(Soft Limit") };
+
+        let mut clients = vec![];
+        let mut addresses = HashMap::new();
+
+        let ds = LocalBroadcaster::new();
+        let rs = EphemeralRegistry::new();
+        let ws = TestWakeupService::new();
+
+        for i in 0..N {
+            let wp = ws.new_provider(i);
+            let ident = TestLogosAccount::new(Self::names(i));
+
+            addresses.insert(i, ident.id().clone());
+            let core_client =
+                ClientType::new_with_name(ident, ds.clone(), rs.clone(), wp, MemStore::new())
+                    .unwrap();
+
+            let client = TestClient::init(core_client);
+
+            clients.push(client);
+        }
+
+        dbg!(&rs);
+
+        Self {
+            addresses,
+            clients,
+            wakeup_service: ws,
+            cb: Box::new(cb),
+            observed_outcomes: vec![],
+        }
+    }
+
+    pub fn client(&mut self, i: usize) -> &TestClient {
+        &self.clients[i]
+    }
+
+    pub fn client_mut(&mut self, i: usize) -> &mut TestClient {
+        &mut self.clients[i]
+    }
+
+    fn names(i: usize) -> &'static str {
+        match i {
+            SARO => "saro",
+            RAYA => "raya",
+            PAX => "pax",
+            MIRA => "mira",
+            _ => "unnamed",
+        }
+    }
+
+    pub fn process(&mut self, duration: Duration) {
+        self.process_payloads();
+
+        let records = self.wakeup_service.advance_time(duration);
+        self.process_records(records);
+    }
+
+    pub fn process_until(&mut self, predicate: impl Fn(&mut TestHarness<N>) -> bool) {
+        let timeout = Duration::from_mins(1);
+        let step = Duration::from_millis(50);
+        let mut elapsed = Duration::ZERO;
+
+        while !predicate(self) {
+            if elapsed >= timeout {
+                panic!("process_until timed out after {:?}", timeout);
+            }
+            self.process(step);
+            elapsed += step;
+        }
+    }
+
+    pub fn process_until_label(
+        &mut self,
+        label: &str,
+        predicate: impl Fn(&mut TestHarness<N>) -> bool,
+    ) {
+        info!(label, "Process Until");
+        self.process_until(predicate);
+    }
+
+    fn process_payloads(&mut self) {
+        // Process existing payloads for all clients.
+        for client in self.clients.iter_mut() {
+            for outcome in client.drain_outcomes() {
+                info!(id = ?client.ident_id(), ?outcome, "Process drain");
+                self.observed_outcomes.push(Observation {
+                    ident: client.ident_id().clone(),
+                    outcome: outcome.clone(),
+                });
+                info!(id = ?client.ident_id(), ?outcome, "Process drain");
+                (self.cb)(client, outcome)
+            }
+        }
+    }
+
+    fn process_records(&mut self, records: Vec<WakeupRecord>) {
+        for record in records {
+            self.clients[record.client_index]
+                .wakeup(&record.convo_id)
+                .expect("Error During wakeup");
+        }
+    }
+}
+
+// Avoid Developer confusion by gating access functions
+// based on the number of clients in the harness
+
+impl TestHarness<1> {
+    pub fn saro(&mut self) -> &mut TestClient {
+        &mut self.clients[SARO]
+    }
+}
+
+impl TestHarness<2> {
+    pub fn saro(&mut self) -> &mut TestClient {
+        &mut self.clients[SARO]
+    }
+
+    pub fn raya(&mut self) -> &mut TestClient {
+        &mut self.clients[RAYA]
+    }
+}
+
+impl TestHarness<3> {
+    pub fn saro(&mut self) -> &mut TestClient {
+        &mut self.clients[SARO]
+    }
+
+    pub fn raya(&mut self) -> &mut TestClient {
+        &mut self.clients[RAYA]
+    }
+
+    pub fn pax(&mut self) -> &mut TestClient {
+        &mut self.clients[PAX]
+    }
+}
+
+impl TestHarness<4> {
+    pub fn saro(&mut self) -> &mut TestClient {
+        &mut self.clients[SARO]
+    }
+
+    pub fn raya(&mut self) -> &mut TestClient {
+        &mut self.clients[RAYA]
+    }
+
+    pub fn pax(&mut self) -> &mut TestClient {
+        &mut self.clients[PAX]
+    }
+
+    pub fn mira(&mut self) -> &mut TestClient {
+        &mut self.clients[MIRA]
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_() {
+        let _ = tracing_subscriber::fmt()
+            .with_max_level(tracing::Level::INFO)
+            .with_test_writer()
+            .try_init();
+
+        let mut harness = TestHarness::<2>::new(|client, outcome| {
+            info!( id=?&client.ident_id(), outcome = ?outcome, "Result");
+        });
+
+        //Create Convo
+        let particpants = &[&harness.raya().addr()];
+        let convo_id = harness
+            .saro()
+            .create_group_convo(particpants)
+            .expect("saro create group");
+
+        harness.process_until_label("Raya Join", |h| h.raya().convo_count() == 1);
+
+        assert_eq!(harness.raya().convo_count(), 1, "raya did not join");
+
+        harness
+            .saro()
+            .send_content(convo_id.as_str(), b"Hello")
+            .expect("raya send");
+
+        harness.process(Duration::from_millis(200));
+
+        assert!(harness.raya().check(&convo_id, b"Hello"))
+    }
+}
diff --git a/core/integration_tests_core/src/wakeup.rs b/core/integration_tests_core/src/wakeup.rs
new file mode 100644
index 0000000..abcb125
--- /dev/null
+++ b/core/integration_tests_core/src/wakeup.rs
@@ -0,0 +1,176 @@
+use libchat::{ConversationId, WakeupService};
+use std::cell::RefCell;
+use std::cmp::Reverse;
+use std::collections::BinaryHeap;
+use std::fmt::Debug;
+use std::rc::Rc;
+use std::time::Duration;
+use tracing::{info, trace};
+
+#[derive(Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub(crate) struct WakeupRecord {
+    pub expiry: Duration,
+    pub client_index: usize,
+    pub convo_id: String,
+}
+
+pub struct TestWakeupProvider {
+    service: Rc<RefCell<InnerWakeupService>>,
+    client_index: usize,
+}
+
+impl Debug for TestWakeupProvider {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("TestWakeupProvider")
+            .field("client_index", &self.client_index)
+            .finish()
+    }
+}
+
+impl TestWakeupProvider {
+    pub fn new(service: Rc<RefCell<InnerWakeupService>>, id: usize) -> Self {
+        Self {
+            service,
+            client_index: id,
+        }
+    }
+}
+
+impl WakeupService for TestWakeupProvider {
+    fn wakeup_in(&mut self, duration: Duration, convo_id: ConversationId) {
+        info!(?duration, convo_id, "Wakeup In");
+        self.service
+            .borrow_mut()
+            .register_wakeup(duration, self.client_index, convo_id);
+    }
+}
+
+pub struct InnerWakeupService {
+    now: Duration,
+    pending: BinaryHeap<Reverse<WakeupRecord>>,
+}
+
+impl InnerWakeupService {
+    pub fn new() -> Self {
+        Self {
+            now: Duration::new(0, 0),
+            pending: BinaryHeap::new(),
+        }
+    }
+
+    pub fn register_wakeup(&mut self, wake_in: Duration, client_index: usize, convo_id: String) {
+        info!(%client_index, ?wake_in, "ask for wake up");
+        self.pending.push(Reverse(WakeupRecord {
+            expiry: self.now + wake_in,
+            client_index,
+            convo_id,
+        }));
+    }
+
+    fn get_expired(&mut self) -> Vec<WakeupRecord> {
+        trace!("Get Expired");
+        let mut fired = vec![];
+
+        while self
+            .pending
+            .peek()
+            .is_some_and(|Reverse(w)| w.expiry <= self.now)
+        {
+            let Reverse(w) = self.pending.pop().unwrap();
+            info!(now = self.now.as_secs(), w.convo_id, "Popping");
+            fired.push(w);
+        }
+
+        fired
+    }
+}
+
+pub struct TestWakeupService {
+    inner: Rc<RefCell<InnerWakeupService>>,
+}
+
+impl Debug for TestWakeupService {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let srv = self.inner.borrow_mut();
+
+        f.debug_struct("TestWakeupService")
+            .field("heap", &srv.pending)
+            .finish()
+    }
+}
+
+impl TestWakeupService {
+    pub fn new() -> Self {
+        Self {
+            inner: Rc::new(RefCell::new(InnerWakeupService::new())),
+        }
+    }
+
+    pub fn new_provider(&self, id: usize) -> TestWakeupProvider {
+        TestWakeupProvider {
+            service: self.inner.clone(),
+            client_index: id,
+        }
+    }
+
+    // Returns the ConvoIDs that triggered in order
+    pub fn advance_time(&mut self, duration: Duration) -> Vec<WakeupRecord> {
+        let mut srv = self.inner.borrow_mut();
+        trace!(?duration, "Advanced");
+        // de-mls deadlines are real wall-clock; sleep so the millisecond-scale
+        // commit/consensus timers actually elapse between poll cycles
+        // Note: This is error prone as WakeupService tracks its own `now` variable. Does not account for processing time.
+        std::thread::sleep(duration);
+
+        srv.now = srv.now.checked_add(duration).unwrap();
+        srv.get_expired()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_wakeup_service() {
+        let _ = tracing_subscriber::fmt().with_test_writer().try_init();
+
+        let mut ws = TestWakeupService::new();
+
+        let mut p1 = ws.new_provider(1);
+        let mut p2 = ws.new_provider(2);
+
+        p1.wakeup_in(Duration::from_secs(2), "convo1".into());
+        p1.wakeup_in(Duration::from_secs(4), "convo1".into());
+
+        p2.wakeup_in(Duration::from_secs(5), "convo1".into());
+        p2.wakeup_in(Duration::from_secs(4), "convo1".into());
+
+        {
+            let batch = ws.advance_time(Duration::from_secs(2));
+            assert_eq!(batch.len(), 1, "too many records");
+            assert_eq!(batch[0].client_index, 1, "client mismatch");
+        }
+
+        {
+            let batch = ws.advance_time(Duration::from_secs(2));
+            assert_eq!(batch.len(), 2, "too many records");
+            assert_eq!(
+                batch[0].client_index, 1,
+                "client 1 shoudld be first, as it was entered first"
+            );
+            assert_eq!(batch[1].client_index, 2, "client 2 should be second");
+        }
+
+        {
+            let batch = ws.advance_time(Duration::from_secs(1));
+            assert_eq!(batch.len(), 1, "too many records");
+            assert_eq!(batch[0].client_index, 2, "client mismatch");
+        }
+
+        {
+            let batch = ws.advance_time(Duration::from_secs(1));
+            assert_eq!(batch.len(), 0, "records should be completely drained");
+        }
+    }
+}
diff --git a/core/integration_tests_core/tests/causal_history.rs b/core/integration_tests_core/tests/causal_history.rs
index 3b244ae..4757d55 100644
--- a/core/integration_tests_core/tests/causal_history.rs
+++ b/core/integration_tests_core/tests/causal_history.rs
@@ -107,7 +107,7 @@ fn missing_group_message_is_detected() {
 
     // Saro creates a group with Raya.
     let raya_id = raya.ident_id().clone();
-    let convo_id = saro.create_group_convo(&[&raya_id]).unwrap().to_string();
+    let convo_id = saro.create_group_convo_v1(&[&raya_id]).unwrap().to_string();
 
     // Raya joins (processes the Welcome + commit).
     raya.process_messages();
diff --git a/core/integration_tests_core/tests/mls_integration.rs b/core/integration_tests_core/tests/mls_integration.rs
index 9f578aa..d80e690 100644
--- a/core/integration_tests_core/tests/mls_integration.rs
+++ b/core/integration_tests_core/tests/mls_integration.rs
@@ -1,212 +1,60 @@
-use std::ops::{Deref, DerefMut};
-
-use components::{EphemeralRegistry, LocalBroadcaster, MemStore};
-use libchat::{
-    Content, ConversationClass, ConvoOutcome, Core, NewConversation, PayloadOutcome, hex_trunc,
-};
-use logos_account::TestLogosAccount;
-
-type ResultCallback = Box<dyn Fn(&PayloadOutcome)>;
-
-// Simple client Functionality for testing
-struct Client {
-    inner: Core<(
-        TestLogosAccount,
-        LocalBroadcaster,
-        EphemeralRegistry,
-        MemStore,
-    )>,
-    on_result: Option<ResultCallback>,
-    new_conversations: Vec<NewConversation>,
-    received_messages: Vec<(libchat::ConversationId, Content)>,
-}
-
-impl Client {
-    fn init(
-        core: Core<(
-            TestLogosAccount,
-            LocalBroadcaster,
-            EphemeralRegistry,
-            MemStore,
-        )>,
-        cb: Option<impl Fn(&PayloadOutcome) + 'static>,
-    ) -> Self {
-        Client {
-            inner: core,
-            on_result: cb.map(|f| Box::new(f) as ResultCallback),
-            new_conversations: Vec::new(),
-            received_messages: Vec::new(),
-        }
-    }
-
-    fn process_messages(&mut self) {
-        let payloads: Vec<_> = {
-            let ds = self.ds();
-            std::iter::from_fn(|| ds.poll()).collect()
-        };
-
-        for data in payloads {
-            let result = self.handle_payload(&data).unwrap();
-            if let Some(cb) = &self.on_result {
-                cb(&result);
-            }
-            match result {
-                PayloadOutcome::Empty => {}
-                PayloadOutcome::Convo(co) => self.absorb_convo_outcome(co),
-                PayloadOutcome::Inbox(io) => {
-                    self.new_conversations.push(io.new_conversation);
-                    if let Some(initial) = io.initial {
-                        self.absorb_convo_outcome(initial);
-                    }
-                }
-            }
-        }
-    }
-
-    fn absorb_convo_outcome(&mut self, outcome: ConvoOutcome) {
-        if let Some(content) = outcome.content {
-            self.received_messages.push((outcome.convo_id, content));
-        }
-    }
-}
-
-impl Deref for Client {
-    type Target = Core<(
-        TestLogosAccount,
-        LocalBroadcaster,
-        EphemeralRegistry,
-        MemStore,
-    )>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.inner
-    }
-}
-
-impl DerefMut for Client {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.inner
-    }
-}
-
-// Higher order function to handle printing
-fn pretty_print(prefix: impl Into<String>) -> ResultCallback {
-    let prefix = prefix.into();
-    Box::new(move |result: &PayloadOutcome| match result {
-        PayloadOutcome::Empty => {}
-        PayloadOutcome::Inbox(io) => {
-            let cid = hex_trunc(io.new_conversation.convo_id.as_bytes());
-            println!(
-                "{prefix}      ({cid:?}) [conversation started: {:?}]",
-                io.new_conversation.class
-            );
-            if let Some(initial) = &io.initial {
-                print_contents(&prefix, initial);
-            }
-        }
-        PayloadOutcome::Convo(co) => print_contents(&prefix, co),
-    })
-}
-
-fn print_contents(prefix: &str, outcome: &ConvoOutcome) {
-    let cid = hex_trunc(outcome.convo_id.as_bytes());
-    if let Some(content) = &outcome.content {
-        let text = String::from_utf8_lossy(&content.bytes);
-        println!("{prefix}      ({cid:?}) {text}");
-    }
-}
-
-fn process(clients: &mut Vec<Client>) {
-    for client in clients {
-        client.process_messages();
-    }
-}
+use integration_tests_core::TestHarness;
+use std::time::Duration;
 
 #[test]
 fn create_group() {
-    let ds = LocalBroadcaster::new();
-    let rs = EphemeralRegistry::new();
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
 
-    let saro_ident = TestLogosAccount::new("saro");
-    let saro =
-        Core::new_with_name(saro_ident, ds.new_consumer(), rs.clone(), MemStore::new()).unwrap();
+    let mut harness = TestHarness::<3>::new(|_, _| {});
 
-    let raya_ident = TestLogosAccount::new("raya");
-    let raya = Core::new_with_name(raya_ident, ds.clone(), rs.clone(), MemStore::new()).unwrap();
+    let raya_id = harness.raya().ident_id().clone();
+    let pax_id = harness.pax().ident_id().clone();
 
-    let mut clients = vec![
-        Client::init(saro, Some(pretty_print("  Saro         "))),
-        Client::init(raya, Some(pretty_print("       Raya    "))),
-    ];
+    const M_R1: &[u8; 12] = b"Hi From Raya";
+    const M_P1: &[u8; 13] = b"Hey it's Pax!";
 
-    const SARO: usize = 0;
-    const RAYA: usize = 1;
+    // Step: Saro Create Convo with Raya
 
-    let raya_id = clients[RAYA].ident_id().clone();
-    let convo_id = clients[SARO]
-        .create_group_convo(&[&raya_id])
-        .unwrap()
-        .to_string();
+    let convo_id = harness
+        .saro()
+        .create_group_convo_v1(&[&raya_id])
+        .expect("Saro invite Raya ");
+    harness.process_until(|h| h.raya().list_conversations().unwrap().len() == 1);
 
-    // Raya can read this message because
-    //   1) It was sent after add_members was committed, and
-    //   2) LocalBroadcaster provides historical messages.
+    // Step: Raya Send Content
 
-    clients[SARO]
-        .send_content(&convo_id, b"ok who broke the group chat again")
-        .unwrap();
+    harness
+        .raya()
+        .send_content(&convo_id, M_R1)
+        .expect("Raya send Msg");
 
-    process(&mut clients);
+    harness.process_until(|h| h.saro().received_messages().len() == 1);
 
-    // Raya should observe exactly one new Group conversation from the
-    // welcome, even though no initial content arrives with it.
-    let raya_started = clients[RAYA]
-        .new_conversations
-        .iter()
-        .filter(|nc| matches!(nc.class, ConversationClass::Group))
-        .count();
-    assert_eq!(
-        raya_started, 1,
-        "Raya should have observed exactly one new Group conversation for the welcome"
-    );
+    // Step: Saro add Pax
 
-    clients[RAYA]
-        .send_content(&convo_id, b"it was literally working five minutes ago")
-        .unwrap();
-
-    process(&mut clients);
-
-    let pax_ident = TestLogosAccount::new("pax");
-    let pax = Core::new_with_name(pax_ident, ds, rs, MemStore::new()).unwrap();
-    clients.push(Client::init(pax, Some(pretty_print("           Pax"))));
-    const PAX: usize = 2;
-
-    let pax_id = clients[PAX].ident_id().clone();
-    clients[SARO]
+    harness
+        .saro()
         .group_add_member(&convo_id, &[&pax_id])
-        .unwrap();
+        .expect("Saro invite pax");
+    harness.process_until(|h| h.pax().list_conversations().unwrap().len() == 1);
 
-    process(&mut clients);
+    // Step: Pax send Content
 
-    let pax_started = clients[PAX]
-        .new_conversations
-        .iter()
-        .filter(|nc| matches!(nc.class, ConversationClass::Group))
-        .count();
-    assert_eq!(
-        pax_started, 1,
-        "Pax should have observed exactly one new Group conversation for the welcome"
-    );
+    harness
+        .pax()
+        .send_content(&convo_id, M_P1)
+        .expect("Pax send");
+    harness.process(Duration::from_millis(500));
 
-    clients[PAX]
-        .send_content(&convo_id, b"ngl the key rotation is cooked")
-        .unwrap();
+    assert!(harness.saro().check(&convo_id, M_R1));
+    assert!(harness.saro().check(&convo_id, M_P1));
 
-    process(&mut clients);
+    assert!(!harness.raya().check(&convo_id, M_R1));
+    assert!(harness.raya().check(&convo_id, M_P1));
 
-    clients[SARO]
-        .send_content(&convo_id, b"bro we literally just added you to the group ")
-        .unwrap();
-
-    process(&mut clients);
+    assert!(!harness.pax().check(&convo_id, M_R1));
+    assert!(!harness.pax().check(&convo_id, M_P1));
 }
diff --git a/core/integration_tests_core/tests/test_group_v2.rs b/core/integration_tests_core/tests/test_group_v2.rs
new file mode 100644
index 0000000..f000423
--- /dev/null
+++ b/core/integration_tests_core/tests/test_group_v2.rs
@@ -0,0 +1,178 @@
+use integration_tests_core::TestHarness;
+use tracing::info;
+
+#[test]
+fn groupv2_2way_roundtrip() {
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
+
+    const S_M1: &[u8] = b"aaaaa";
+    const R_M1: &[u8] = b"Hello";
+
+    // Initialize TestHarness with 2 clients
+    let mut harness = TestHarness::<2>::new(|_, _| {});
+
+    //Saro Create Convo
+    let particpants = &[&harness.raya().addr()];
+    let convo_id = harness
+        .saro()
+        .create_group_convo_v2(particpants)
+        .expect("saro create group");
+
+    // Carry the invite through (commit, WelcomeReady, routing to Raya's inbox,
+    // accept_welcome); settle until Raya has joined.
+    harness.process_until_label("Saro Send", |h| h.raya().convo_count() == 1);
+
+    // Saro sends a message; settle until Raya receives it.
+    info!(target: "chat", "Saro -> sending: {S_M1:?}");
+    harness
+        .saro()
+        .send_content(&convo_id, S_M1)
+        .expect("saro send");
+
+    harness.process_until(|h| h.raya().check(&convo_id, S_M1));
+
+    // Raya replies; settle until Saro receives it.
+    info!(target: "chat", "Raya -> sending:{R_M1:?}");
+    harness.raya().send_content(&convo_id, R_M1).unwrap();
+    harness.process_until(|h| h.saro().check(&convo_id, R_M1));
+}
+
+#[test]
+fn core_client() {
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
+
+    const S_M1: &[u8] = b"HI";
+    const R_M1: &[u8] = b"hi back";
+    const S_M2: &[u8] = b"EPOCHCHK";
+
+    let mut harness = TestHarness::<3>::new(|_, _| {});
+
+    let particpants = &[&harness.raya().addr()];
+    let convo_id = harness
+        .saro()
+        .create_group_convo_v2(particpants)
+        .expect("Saro create");
+
+    // Carry the invite through (commit, WelcomeReady, routing to Raya's inbox,
+    // accept_welcome); settle until Raya has joined.
+    harness.process_until_label("saro create", |h| h.raya().convo_count() == 1);
+
+    // Saro sends a message; settle until Raya receives it.
+    info!(target: "chat", "Saro -> sending: {S_M1:?}");
+    harness
+        .saro()
+        .send_content(&convo_id, S_M1)
+        .expect("saro send");
+
+    harness.process_until_label("Recv S_M1", |h| h.raya().check(&convo_id, S_M1));
+
+    // Raya replies; settle until Saro receives it.
+    info!(target: "chat", "Raya -> sending: {R_M1:?}");
+    harness
+        .raya()
+        .send_content(&convo_id, R_M1)
+        .expect("raya send");
+
+    harness.process_until_label("Recv R_M1", |h| h.saro().check(&convo_id, R_M1));
+
+    // Raya (a non-creator) invites Pax; settle until Pax has joined.
+    let particpants = &[&harness.pax().addr()];
+    harness
+        .raya()
+        .group_add_member(&convo_id, particpants)
+        .expect("Raya add Pax");
+
+    harness.process_until_label("Raya add Pax", |h| h.pax().convo_count() == 1);
+
+    // Everyone must be at the SAME epoch after Pax joined: a marker Saro sends
+    // now decrypts only for members that applied the Add commit.
+    info!(target: "chat", "Saro -> sending: EPOCHCHK");
+    harness.saro().send_content(&convo_id, S_M2).unwrap();
+
+    harness.process_until_label("epoch check", |h| {
+        h.raya().check(&convo_id, S_M2) && h.pax().check(&convo_id, S_M2)
+    });
+}
+
+#[test]
+fn core_client_batch_add() {
+    // Saro creates the group and adds BOTH Raya and Pax at the same time: one
+    // Add commit producing a single welcome that names both joiners.
+
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer();
+
+    let mut harness = TestHarness::<3>::new(|_, _| {});
+
+    let particpants = &[&harness.raya().addr(), &harness.pax().addr()];
+    harness
+        .saro()
+        .create_group_convo_v2(particpants)
+        .expect("Saro create");
+
+    // Carry the invite through (commit, WelcomeReady, routing to Raya's inbox,
+    // accept_welcome); settle until Raya has joined.
+    harness.process_until_label("saro create", |h| {
+        h.raya().convo_count() == 1 && h.pax().convo_count() == 1
+    });
+}
+
+#[test]
+fn core_client_four_members_two_epochs() {
+    // Epoch 1: Saro creates and batch-adds Raya + Pax (3 members). Epoch 2: Raya
+    // (a non-creator) adds a 4th member, Mira. Afterwards every member must be
+    // at the same epoch (each can decrypt a freshly-sent message) and settled
+    // back in Working (the >sn_max election that the 4th member triggers must
+    // have completed — no one stuck in Freezing/Selection/Reelection).
+
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
+
+    const MSG: &[u8] = b"CONVERGED";
+
+    let mut harness = TestHarness::<4>::new(|_, _| {});
+
+    let particpants = &[&harness.raya().addr(), &harness.pax().addr()];
+    let convo_id = harness
+        .saro()
+        .create_group_convo_v2(particpants)
+        .expect("Saro create");
+
+    // Carry the invite through (commit, WelcomeReady, routing to Raya's inbox,
+    // accept_welcome); settle until Raya has joined.
+    harness.process_until_label("Raya + Pax join", |h| {
+        h.raya().convo_count() == 1 && h.pax().convo_count() == 1
+    });
+
+    // Epoch 2: Raya adds the 4th member; settle until Mira has joined and the
+    // >sn_max election has returned everyone to Working.
+    let members = &[&harness.mira().addr()];
+    harness
+        .raya()
+        .group_add_member(&convo_id, members)
+        .expect("Add Mira");
+
+    // TODO: Add State == Working for all clients
+    harness.process_until_label("Mira join", |h| h.mira().convo_count() == 1);
+
+    // Same epoch: a message Saro sends now must reach all three peers.
+    harness
+        .saro()
+        .send_content(&convo_id, MSG)
+        .expect("Saro send");
+
+    harness.process_until_label("all chats converge", |h| {
+        h.raya().check(&convo_id, MSG)
+            && h.pax().check(&convo_id, MSG)
+            && h.mira().check(&convo_id, MSG)
+    });
+}