Ignore non-string task CLI previews (#1559)

tests/test_tasks_cli_preview.py

@@ -0,0 +1,31 @@
+import importlib.machinery
+import importlib.util
+import sys
+import types
+from pathlib import Path
+from unittest.mock import MagicMock
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def _load_cli(monkeypatch):
+    db = types.ModuleType("core.database")
+    db.SessionLocal = MagicMock()
+    db.ScheduledTask = MagicMock()
+    db.TaskRun = MagicMock()
+    monkeypatch.setitem(sys.modules, "core.database", db)
+    path = ROOT / "scripts" / "odysseus-tasks"
+    loader = importlib.machinery.SourceFileLoader("odysseus_tasks_cli", str(path))
+    spec = importlib.util.spec_from_loader(loader.name, loader)
+    module = importlib.util.module_from_spec(spec)
+    loader.exec_module(module)
+    return module
+
+
+def test_preview_text_ignores_non_string_values(monkeypatch):
+    cli = _load_cli(monkeypatch)
+
+    assert cli._preview_text(None) == ""
+    assert cli._preview_text({"bad": "row"}) == ""
+    assert cli._preview_text("x" * 201) == ("x" * 200) + "…"