test: faster test execution in codex-core (#2633)

this dramatically improves time to run `cargo test -p codex-core` (~25x
speedup).

before:
```
cargo test -p codex-core  35.96s user 68.63s system 19% cpu 8:49.80 total
```

after:
```
cargo test -p codex-core  5.51s user 8.16s system 63% cpu 21.407 total
```

both tests measured "hot", i.e. on a 2nd run with no filesystem changes,
to exclude compile times.

approach inspired by [Delete Cargo Integration
Tests](https://matklad.github.io/2021/02/27/delete-cargo-integration-tests.html),
we move all test cases in tests/ into a single suite in order to have a
single binary, as there is significant overhead for each test binary
executed, and because test execution is only parallelized with a single
binary.

codex-rs/chatgpt/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/chatgpt/tests/suite/mod.rs

@@ -0,0 +1,2 @@
+// Aggregates all former standalone integration tests as modules.
+mod apply_command_e2e;

codex-rs/core/Cargo.toml

@@ -6,6 +6,7 @@ version = { workspace = true }
 [lib]
 name = "codex_core"
 path = "src/lib.rs"
+doctest = false
 
 [lints]
 workspace = true

codex-rs/core/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/all/`.
+mod suite;

codex-rs/core/tests/suite/mod.rs

@@ -0,0 +1,12 @@
+// Aggregates all former standalone integration tests as modules.
+
+mod cli_stream;
+mod client;
+mod compact;
+mod exec;
+mod exec_stream_events;
+mod live_cli;
+mod prompt_caching;
+mod seatbelt;
+mod stream_error_allows_next_turn;
+mod stream_no_completed;

codex-rs/core/tests/suite/prompt_caching.rs

@@ -107,8 +107,8 @@ async fn codex_mini_latest_tools() {
     assert_eq!(requests.len(), 2, "expected two POST requests");
 
     let expected_instructions = [
-        include_str!("../prompt.md"),
-        include_str!("../../apply-patch/apply_patch_tool_instructions.md"),
+        include_str!("../../prompt.md"),
+        include_str!("../../../apply-patch/apply_patch_tool_instructions.md"),
     ]
     .join("\n");
 
@@ -188,7 +188,7 @@ async fn prompt_tools_are_consistent_across_requests() {
     let requests = server.received_requests().await.unwrap();
     assert_eq!(requests.len(), 2, "expected two POST requests");
 
-    let expected_instructions: &str = include_str!("../prompt.md");
+    let expected_instructions: &str = include_str!("../../prompt.md");
     // our internal implementation is responsible for keeping tools in sync
     // with the OpenAI schema, so we just verify the tool presence here
     let expected_tools_names: &[&str] = &["shell", "update_plan", "apply_patch"];

codex-rs/exec/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/exec/tests/suite/mod.rs

@@ -0,0 +1,3 @@
+// Aggregates all former standalone integration tests as modules.
+mod apply_patch;
+mod sandbox;

codex-rs/execpolicy/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/execpolicy/tests/suite/mod.rs

@@ -0,0 +1,10 @@
+// Aggregates all former standalone integration tests as modules.
+mod bad;
+mod cp;
+mod good;
+mod head;
+mod literal;
+mod ls;
+mod parse_sed_command;
+mod pwd;
+mod sed;

codex-rs/linux-sandbox/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/linux-sandbox/tests/suite/mod.rs

@@ -0,0 +1,2 @@
+// Aggregates all former standalone integration tests as modules.
+mod landlock;

codex-rs/login/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/login/tests/suite/mod.rs

@@ -0,0 +1,2 @@
+// Aggregates all former standalone integration tests as modules.
+mod login_server_e2e;

codex-rs/mcp-server/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/mcp-server/tests/suite/mod.rs

@@ -0,0 +1,8 @@
+// Aggregates all former standalone integration tests as modules.
+mod auth;
+mod codex_message_processor_flow;
+mod codex_tool;
+mod create_conversation;
+mod interrupt;
+mod login;
+mod send_message;

codex-rs/mcp-types/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/mcp-types/tests/suite/mod.rs

@@ -0,0 +1,3 @@
+// Aggregates all former standalone integration tests as modules.
+mod initialize;
+mod progress_notification;

codex-rs/tui/tests/all.rs

@@ -0,0 +1,3 @@
+// Single integration test binary that aggregates all test modules.
+// The submodules live in `tests/suite/`.
+mod suite;

codex-rs/tui/tests/suite/mod.rs

@@ -0,0 +1,5 @@
+// Aggregates all former standalone integration tests as modules.
+mod status_indicator;
+mod vt100_history;
+mod vt100_live_commit;
+mod vt100_streaming_no_dup;