add slot ttl output with effective timeout config

agent/nix_builder_autoscaler/tests/test_cli.py

@@ -2,10 +2,12 @@
 
 from __future__ import annotations
 
+from datetime import UTC, datetime, timedelta
+
 import pytest
 
 from nix_builder_autoscaler import cli
-from nix_builder_autoscaler.cli import _parse_args, _print_status_summary
+from nix_builder_autoscaler.cli import _parse_args, _print_slots, _print_status_summary, _slot_ttl
 
 
 def test_parse_args_without_command_prints_help_and_exits_zero(
@@ -95,3 +97,55 @@ def test_bulk_unquarantine_only_targets_error_slots(monkeypatch: pytest.MonkeyPa
     assert summary["succeeded"] == 1
     assert summary["failed"] == 0
     assert summary["skipped"] == 1
+
+
+def test_slot_ttl_ready_pinned_at_min_slots() -> None:
+    now = datetime.now(UTC)
+    slot = {
+        "state": "ready",
+        "lease_count": 0,
+        "last_state_change": (now - timedelta(seconds=60)).isoformat(),
+    }
+    policy = {
+        "capacity": {
+            "min_slots": 1,
+            "idle_scale_down_seconds": 900,
+            "launch_timeout_seconds": 300,
+            "boot_timeout_seconds": 300,
+            "binding_timeout_seconds": 180,
+            "drain_timeout_seconds": 120,
+            "terminating_timeout_seconds": 300,
+        },
+        "scheduler": {"reconcile_seconds": 15.0},
+    }
+    assert _slot_ttl(slot, policy, active_slots=1) == "pinned"
+
+
+def test_print_slots_includes_ttl_column(capsys: pytest.CaptureFixture[str]) -> None:
+    now = datetime.now(UTC)
+    slots = [
+        {
+            "slot_id": "slot001",
+            "state": "launching",
+            "instance_id": "i-123",
+            "instance_ip": None,
+            "lease_count": 0,
+            "last_state_change": (now - timedelta(seconds=20)).isoformat(),
+        }
+    ]
+    policy = {
+        "capacity": {
+            "min_slots": 0,
+            "idle_scale_down_seconds": 900,
+            "launch_timeout_seconds": 300,
+            "boot_timeout_seconds": 300,
+            "binding_timeout_seconds": 180,
+            "drain_timeout_seconds": 120,
+            "terminating_timeout_seconds": 300,
+        },
+        "scheduler": {"reconcile_seconds": 15.0},
+    }
+    _print_slots(slots, policy)
+    out = capsys.readouterr().out
+    assert "ttl" in out
+    assert "slot001" in out