boxmaker/docs/plans/M5c1/files/crates/loopd/tests/turn_broker.rs

//! Tests for what the turn loop does with the broker's answers: denials, pending approvals, and
//! a port that misbehaves. Do not edit.

mod support;
#[path = "support/turn.rs"]
mod turn_support;

use bxcore::{DataClass, DenyReason, LogRecord, Timestamp, ToolResponse, TurnEvent};
use support::{Reply, ReturnsPendingPort, ok_result, pending};
use turn_support::{setup, types};

const CHAT: &str = "/v1/chat/completions";

/// The tool events of a turn, in order, as short strings.
fn tool_events(events: &[TurnEvent]) -> Vec<String> {
    events
        .iter()
        .filter_map(|e| match e {
            TurnEvent::ToolCallStarted { name } => Some(format!("started {name}")),
            TurnEvent::ApprovalPending { approval, tool, .. } => {
                Some(format!("pending {approval} {tool}"))
            }
            TurnEvent::ToolDenied { name, reason } => Some(format!("denied {name} {reason:?}")),
            TurnEvent::ToolResult { name, .. } => Some(format!("result {name}")),
            _ => None,
        })
        .collect()
}

#[test]
fn a_denial_is_a_fixed_sentence_for_the_model_and_an_event_for_the_owner() {
    let s = setup(vec![ToolResponse::Denied {
        reason: DenyReason::TaintTooHigh,
        detail: None,
    }]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("tool_call"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let (result, events) = s.turn(&mut session, "x");
    assert!(
        result.is_ok(),
        "the turn goes on after a denial: {result:?}"
    );
    match &session.records()[4] {
        LogRecord::ToolResult {
            content,
            class,
            untrusted,
            truncated,
            ..
        } => {
            assert_eq!(
                content,
                "Denied: this session has seen data too sensitive for this call."
            );
            assert_eq!(
                (*class, *untrusted, *truncated),
                (DataClass::Public, false, false)
            );
        }
        other => panic!("{other:?}"),
    }
    assert_eq!(
        tool_events(&events),
        [
            "started read_file",
            "denied read_file TaintTooHigh",
            "result read_file"
        ],
        "the denial comes before the result"
    );
    // The model reads the sentence in the next request.
    let m2 = s.server.requests_to(CHAT)[1].json();
    assert_eq!(
        m2["messages"][3]["content"],
        "Denied: this session has seen data too sensitive for this call."
    );
}

/// The broker's detail reaches the model, in the log and in the next request; the owner's event
/// is the same as for any denial.
#[test]
fn an_invalid_call_tells_the_model_why() {
    let s = setup(vec![ToolResponse::Denied {
        reason: DenyReason::InvalidArguments,
        detail: Some("invalid path: n/a".to_string()),
    }]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("tool_call"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let (result, events) = s.turn(&mut session, "x");
    assert!(result.is_ok(), "{result:?}");
    let want = "Denied: the arguments are not valid for this tool: invalid path: n/a.";
    match &session.records()[4] {
        LogRecord::ToolResult {
            content,
            class,
            untrusted,
            truncated,
            ..
        } => {
            assert_eq!(content, want);
            assert_eq!(
                (*class, *untrusted, *truncated),
                (DataClass::Public, false, false)
            );
        }
        other => panic!("{other:?}"),
    }
    assert_eq!(
        tool_events(&events),
        [
            "started read_file",
            "denied read_file InvalidArguments",
            "result read_file"
        ]
    );
    let m2 = s.server.requests_to(CHAT)[1].json();
    assert_eq!(m2["messages"][3]["content"], want);
}

#[test]
fn a_denied_call_tool_names_the_target_tool_in_the_denial() {
    let s = setup(vec![ToolResponse::Denied {
        reason: DenyReason::NoGrant,
        detail: None,
    }]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("call_tool"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let (result, events) = s.turn(&mut session, "echo box");
    assert!(result.is_ok(), "{result:?}");
    assert_eq!(
        tool_events(&events),
        [
            "started call_tool",
            "denied echo NoGrant",
            "result call_tool"
        ],
        "the owner writes grants for `echo`, not for `call_tool`"
    );
    assert!(
        matches!(&session.records()[4], LogRecord::ToolResult { content, .. } if content == "Denied: no grant allows this call.")
    );
}

#[test]
fn a_pending_approval_is_an_event_and_the_answer_after_it_is_the_result() {
    let s = setup(vec![
        pending(41, "2026-09-18T12:15:00.000Z"),
        ok_result("straylight\n"),
    ]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("tool_call"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let (result, events) = s.turn(&mut session, "x");
    assert!(result.is_ok(), "{result:?}");
    assert_eq!(
        tool_events(&events),
        [
            "started read_file",
            "pending 41 read_file",
            "result read_file"
        ]
    );
    let expires = events.iter().find_map(|e| match e {
        TurnEvent::ApprovalPending { expires, .. } => Some(*expires),
        _ => None,
    });
    assert_eq!(
        expires,
        Some(Timestamp::parse("2026-09-18T12:15:00.000Z").unwrap())
    );
    assert_eq!(s.port.calls().len(), 1, "one call, however long it waited");
    assert_eq!(
        types(session.records()),
        [
            "start",
            "user",
            "assistant",
            "usage",
            "tool_result",
            "assistant",
            "usage"
        ],
        "waiting writes nothing to the log"
    );
    assert!(
        matches!(&session.records()[4], LogRecord::ToolResult { content, .. } if content == "straylight\n")
    );
}

#[test]
fn a_pending_approval_that_ends_in_a_refusal() {
    let s = setup(vec![
        pending(7, "2026-09-18T12:15:00.000Z"),
        ToolResponse::Denied {
            reason: DenyReason::ApprovalRefused,
            detail: None,
        },
    ]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("tool_call"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let (result, events) = s.turn(&mut session, "x");
    assert!(result.is_ok(), "{result:?}");
    assert_eq!(
        tool_events(&events),
        [
            "started read_file",
            "pending 7 read_file",
            "denied read_file ApprovalRefused",
            "result read_file"
        ]
    );
    assert!(
        matches!(&session.records()[4], LogRecord::ToolResult { content, .. } if content == "Denied: the owner refused this call.")
    );
}

#[test]
fn a_port_that_returns_a_pending_frame_as_its_answer_is_a_failure_not_a_decision() {
    let s = setup(vec![]);
    s.server.route(
        CHAT,
        vec![Reply::fixture("tool_call"), Reply::fixture("plain")],
    );
    let mut session = s.session("a");
    let runtime = loopd::turn::Runtime {
        cfg: &s.cfg,
        client: &s.client,
        port: &ReturnsPendingPort,
        registry: &s.registry,
    };
    let mut events = Vec::new();
    let result = loopd::turn::run_turn(&mut session, &runtime, "x", None, &mut |e| {
        events.push(e.clone())
    });
    assert!(result.is_ok(), "{result:?}");
    match &session.records()[4] {
        LogRecord::ToolResult {
            content,
            class,
            untrusted,
            ..
        } => {
            assert_eq!(
                content,
                "The tool failed: the tool broker gave no final answer"
            );
            assert_eq!((*class, *untrusted), (DataClass::Public, false));
        }
        other => panic!("{other:?}"),
    }
    assert_eq!(
        tool_events(&events),
        ["started read_file", "result read_file"],
        "neither pending nor denied: the port said neither"
    );
}