test(frontend): cover ArtifactWidget view-only + multiselect allow_empty gate

frontend/src/widgets/ArtifactWidget.test.tsx

@@ -0,0 +1,21 @@
+import { render, screen } from "@testing-library/react";
+import { ArtifactWidget } from "./ArtifactWidget";
+
+test("renders artifact content view-only with no response path", () => {
+  const onRespond = vi.fn();
+  render(
+    <ArtifactWidget
+      descriptor={{
+        id: "u1",
+        widget: "artifact",
+        artifact: { kind: "result", content: "SELECT 1" },
+      }}
+      onRespond={onRespond}
+    />
+  );
+  // (a) content is rendered
+  expect(screen.getByText("SELECT 1")).toBeInTheDocument();
+  // (b) no response path: no responding button, onRespond never called
+  expect(screen.queryByRole("button")).not.toBeInTheDocument();
+  expect(onRespond).not.toHaveBeenCalled();
+});

frontend/src/widgets/MultiselectWidget.test.tsx

@@ -81,6 +81,30 @@ test("confirm is disabled when nothing checked and allow_empty is false", async
   expect(onRespond).not.toHaveBeenCalled();
 });
 
+test("deselect-all with allow_empty false disables Conferma (empty confirm impossible)", async () => {
+  const onRespond = vi.fn();
+  render(
+    <MultiselectWidget
+      descriptor={{
+        id: "u1",
+        widget: "multiselect",
+        allow_empty: false,
+        options: [
+          { id: "a", label: "Alpha", selected: true },
+          { id: "b", label: "Beta", selected: true },
+        ],
+      }}
+      onRespond={onRespond}
+    />
+  );
+  const btn = screen.getByRole("button", { name: /conferma/i });
+  expect(btn).not.toBeDisabled();
+  await userEvent.click(screen.getByRole("button", { name: /deseleziona tutti/i }));
+  expect(btn).toBeDisabled();
+  await userEvent.click(btn);
+  expect(onRespond).not.toHaveBeenCalled();
+});
+
 test("confirm is enabled when allow_empty is false but something is checked", async () => {
   const onRespond = vi.fn();
   render(