test: cover glances widget internal modules

src/widgets/glances/metrics/memory.test.jsx

@@ -0,0 +1,22 @@
+// @vitest-environment jsdom
+
+import { screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+
+import { renderWithProviders } from "test-utils/render-with-providers";
+
+const { useWidgetAPI } = vi.hoisted(() => ({ useWidgetAPI: vi.fn() }));
+vi.mock("utils/proxy/use-widget-api", () => ({ default: useWidgetAPI }));
+vi.mock("next/dynamic", () => ({ default: () => () => null }));
+
+import Component from "./memory";
+
+describe("widgets/glances/metrics/memory", () => {
+  it("renders a placeholder while loading", () => {
+    useWidgetAPI.mockReturnValue({ data: undefined, error: undefined });
+    renderWithProviders(<Component service={{ widget: { chart: false, version: 3, pointsLimit: 3 } }} />, {
+      settings: { hideErrors: false },
+    });
+    expect(screen.getByText("-")).toBeInTheDocument();
+  });
+});