From 1bef42a91bf7f2e845cf240ca1035c44852a63e7 Mon Sep 17 00:00:00 2001
From: Ahmed Ibrahim <aibrahim@openai.com>
Date: Sun, 8 Feb 2026 21:37:26 -0800
Subject: [PATCH] tests

---
 .../core/tests/suite/discoverable_history.rs  | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 codex-rs/core/tests/suite/discoverable_history.rs

diff --git a/codex-rs/core/tests/suite/discoverable_history.rs b/codex-rs/core/tests/suite/discoverable_history.rs
new file mode 100644
index 0000000000..ea37e1c42c
--- /dev/null
+++ b/codex-rs/core/tests/suite/discoverable_history.rs
@@ -0,0 +1,73 @@
+#![cfg(not(target_os = "windows"))]
+
+use anyhow::Context;
+use anyhow::Result;
+use codex_core::protocol::EventMsg;
+use codex_protocol::user_input::UserInput;
+use core_test_support::responses::ev_completed;
+use core_test_support::responses::ev_response_created;
+use core_test_support::responses::mount_sse_once;
+use core_test_support::responses::sse;
+use core_test_support::responses::start_mock_server;
+use core_test_support::skip_if_no_network;
+use core_test_support::test_codex::test_codex;
+use core_test_support::wait_for_event;
+use sha2::Digest;
+use sha2::Sha256;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn oversized_user_message_is_stored_as_discoverable_item() -> Result<()> {
+    skip_if_no_network!(Ok(()));
+
+    let server = start_mock_server().await;
+    let request_log = mount_sse_once(
+        &server,
+        sse(vec![ev_response_created("resp-1"), ev_completed("resp-1")]),
+    )
+    .await;
+
+    let mut builder = test_codex().with_config(|config| {
+        config.model_context_window = Some(100);
+    });
+    let test = builder.build(&server).await?;
+
+    let large_prompt = "oversized user prompt ".repeat(800);
+    test.codex
+        .submit(codex_core::protocol::Op::UserInput {
+            items: vec![UserInput::Text {
+                text: large_prompt.clone(),
+                text_elements: Vec::new(),
+            }],
+            final_output_json_schema: None,
+        })
+        .await?;
+
+    wait_for_event(&test.codex, |ev| matches!(ev, EventMsg::TurnComplete(_))).await;
+
+    let request = request_log.single_request();
+    let mut hasher = Sha256::new();
+    hasher.update(large_prompt.as_bytes());
+    let expected_checksum = format!("{:x}", hasher.finalize());
+    let discoverable_root = test.codex_home_path().join("discovarable_items");
+    let expected_path = std::fs::read_dir(&discoverable_root)
+        .context("read discoverable_items dir")?
+        .filter_map(|entry| entry.ok())
+        .map(|entry| entry.path().join("user_message").join(&expected_checksum))
+        .find(|candidate| candidate.is_file())
+        .context("expected discoverable file was not created")?;
+    assert!(expected_path.is_file(), "discoverable file should exist");
+
+    let expected = format!(
+        "User message was too large. Read it from <{}>",
+        expected_path.display()
+    );
+    let actual = request
+        .message_input_texts("user")
+        .into_iter()
+        .find(|text| text.contains(&expected_checksum))
+        .context("missing discoverable replacement text in user input")?;
+
+    assert_eq!(actual, expected);
+
+    Ok(())
+}