diff --git a/pythnet/pythnet_sdk/src/test_utils/mod.rs b/pythnet/pythnet_sdk/src/test_utils/mod.rs
index b2bd1c285..e180b87d0 100644
--- a/pythnet/pythnet_sdk/src/test_utils/mod.rs
+++ b/pythnet/pythnet_sdk/src/test_utils/mod.rs
@@ -31,7 +31,11 @@ use {
     },
     serde_wormhole::RawMessage,
     wormhole_sdk::{
-        vaa::digest,
+        vaa::{
+            digest,
+            Body,
+            Header,
+        },
         Address,
         Chain,
         Vaa,
@@ -174,9 +178,18 @@ pub fn create_vaa_from_payload(
     emitter_chain: Chain,
     sequence: u64,
 ) -> Vaa<Box<RawMessage>> {
-    let digest = libsecp256k1Message::parse_slice(&digest(payload).unwrap().secp256k_hash).unwrap();
     let guardians = create_dummy_guardians();
 
+    let body: Body<Box<RawMessage>> = Body {
+        emitter_chain,
+        emitter_address,
+        sequence,
+        payload: <Box<RawMessage>>::from(payload.to_vec()),
+        ..Default::default()
+    };
+
+    let digest = libsecp256k1Message::parse_slice(&body.digest().unwrap().secp256k_hash).unwrap();
+
     let signatures: Vec<(Signature, RecoveryId)> = guardians[0..NUM_SIGNATURES]
         .iter()
         .map(|x| libsecp256k1::sign(&digest, &x))
@@ -195,15 +208,13 @@ pub fn create_vaa_from_payload(
         })
         .collect();
 
-    let vaa: Vaa<Box<RawMessage>> = Vaa {
+
+    let header = Header {
         version: 1,
-        emitter_chain,
-        emitter_address,
-        sequence,
-        payload: <Box<RawMessage>>::from(payload.to_vec()),
         signatures: wormhole_signatures,
         ..Default::default()
     };
 
-    vaa
+
+    (header, body).into()
 }
diff --git a/target_chains/solana/programs/pyth-solana-receiver/tests/test_initialize.rs b/target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates.rs
similarity index 100%
rename from target_chains/solana/programs/pyth-solana-receiver/tests/test_initialize.rs
rename to target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates.rs
diff --git a/target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates_atomic.rs b/target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates_atomic.rs
new file mode 100644
index 000000000..eea97fea5
--- /dev/null
+++ b/target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates_atomic.rs
@@ -0,0 +1,117 @@
+use {
+    crate::common::{
+        trim_vaa_signatures,
+        DEFAULT_GUARDIAN_SET_INDEX,
+    },
+    common::{
+        setup_pyth_receiver,
+        ProgramTestFixtures,
+    },
+    pyth_solana_receiver::{
+        instruction::PostUpdatesAtomic,
+        sdk::deserialize_accumulator_update_data,
+        state::price_update::{
+            PriceUpdateV1,
+            VerificationLevel,
+        },
+    },
+    pythnet_sdk::{
+        messages::Message,
+        test_utils::{
+            create_accumulator_message,
+            create_dummy_price_feed_message,
+        },
+    },
+    solana_sdk::{
+        signature::Keypair,
+        signer::Signer,
+    },
+    wormhole_core_bridge_solana::ID as BRIDGE_ID,
+};
+
+mod common;
+
+
+#[tokio::test]
+async fn test_post_updates_atomic() {
+    let feed_1 = create_dummy_price_feed_message(100);
+    let feed_2 = create_dummy_price_feed_message(200);
+    let message = create_accumulator_message(&[feed_1, feed_2], &[feed_1, feed_2], false);
+    let (vaa, merkle_price_updates) = deserialize_accumulator_update_data(message).unwrap();
+
+    let vaa = trim_vaa_signatures(vaa, 5);
+
+    let ProgramTestFixtures {
+        mut program_simulator,
+        encoded_vaa_addresses: _,
+    } = setup_pyth_receiver(vec![]).await;
+
+    let poster = program_simulator.get_funded_keypair().await.unwrap();
+    let price_update_keypair = Keypair::new();
+
+    // post one update atomically
+    program_simulator
+        .process_ix(
+            PostUpdatesAtomic::populate(
+                poster.pubkey(),
+                price_update_keypair.pubkey(),
+                BRIDGE_ID,
+                DEFAULT_GUARDIAN_SET_INDEX,
+                vaa.clone(),
+                merkle_price_updates[0].clone(),
+            ),
+            &vec![&poster, &price_update_keypair],
+            None,
+        )
+        .await
+        .unwrap();
+
+
+    let mut price_update_account = program_simulator
+        .get_anchor_account_data::<PriceUpdateV1>(price_update_keypair.pubkey())
+        .await
+        .unwrap();
+
+    assert_eq!(price_update_account.write_authority, poster.pubkey());
+    assert_eq!(
+        price_update_account.verification_level,
+        VerificationLevel::Partial(5)
+    );
+    assert_eq!(
+        Message::PriceFeedMessage(price_update_account.price_message),
+        feed_1
+    );
+
+    // post another update to the same account
+    program_simulator
+        .process_ix(
+            PostUpdatesAtomic::populate(
+                poster.pubkey(),
+                price_update_keypair.pubkey(),
+                BRIDGE_ID,
+                DEFAULT_GUARDIAN_SET_INDEX,
+                vaa.clone(),
+                merkle_price_updates[1].clone(),
+            ),
+            &vec![&poster, &price_update_keypair],
+            None,
+        )
+        .await
+        .unwrap();
+
+
+    price_update_account = program_simulator
+        .get_anchor_account_data::<PriceUpdateV1>(price_update_keypair.pubkey())
+        .await
+        .unwrap();
+
+    assert_eq!(price_update_account.write_authority, poster.pubkey());
+    assert_eq!(
+        price_update_account.verification_level,
+        VerificationLevel::Partial(5)
+    );
+    assert_eq!(
+        Message::PriceFeedMessage(price_update_account.price_message),
+        feed_2
+    );
+}