test(wallet): pin private-transaction note padding to max

integration_tests/tests/private_transaction_padding.rs

@@ -0,0 +1,34 @@
+#![expect(
+    clippy::tests_outside_test_module,
+    reason = "We don't care about these in tests"
+)]
+
+use anyhow::Result;
+use integration_tests::{TestContext, fetch_privacy_preserving_tx, new_account, private_mention};
+use tokio::test;
+use wallet::cli::{
+    Command, SubcommandReturnValue, programs::native_token_transfer::AuthTransferSubcommand,
+};
+
+#[test]
+async fn private_transaction_pads_notes_to_max() -> Result<()> {
+    let mut ctx = TestContext::new().await?;
+
+    let account_id = new_account(&mut ctx, true, None).await?;
+
+    let command = Command::AuthTransfer(AuthTransferSubcommand::Init {
+        account_id: private_mention(account_id),
+    });
+    let result = wallet::cli::execute_subcommand(ctx.wallet_mut(), command).await?;
+    let SubcommandReturnValue::TransactionExecuted { tx_hash } = result else {
+        anyhow::bail!("Expected TransactionExecuted return value");
+    };
+
+    let tx = fetch_privacy_preserving_tx(ctx.sequencer_client(), tx_hash).await;
+
+    assert_eq!(tx.message.new_commitments.len(), 7);
+    assert_eq!(tx.message.new_nullifiers.len(), 7);
+    assert_eq!(tx.message.encrypted_private_post_states.len(), 7);
+
+    Ok(())
+}