Reject invalid preset CLI stores (#1395)

tests/test_preset_cli_store.py

@@ -0,0 +1,28 @@
+import importlib.machinery
+import importlib.util
+from pathlib import Path
+
+import pytest
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def _load_cli():
+    path = ROOT / "scripts" / "odysseus-preset"
+    loader = importlib.machinery.SourceFileLoader("odysseus_preset_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_load_rejects_non_object_preset_store(tmp_path, capsys):
+    cli = _load_cli()
+    cli._PATH = tmp_path / "presets.json"
+    cli._PATH.write_text("[]")
+
+    with pytest.raises(SystemExit):
+        cli._load()
+
+    assert "expected an object" in capsys.readouterr().err