test: add info widget component tests

src/components/widgets/greeting/greeting.test.jsx

@@ -0,0 +1,20 @@
+// @vitest-environment jsdom
+
+import { screen } from "@testing-library/react";
+import { describe, expect, it } from "vitest";
+
+import { renderWithProviders } from "test-utils/render-with-providers";
+
+import Greeting from "./greeting";
+
+describe("components/widgets/greeting", () => {
+  it("renders nothing when text is not configured", () => {
+    const { container } = renderWithProviders(<Greeting options={{}} />, { settings: { target: "_self" } });
+    expect(container).toBeEmptyDOMElement();
+  });
+
+  it("renders configured greeting text", () => {
+    renderWithProviders(<Greeting options={{ text: "Hello there" }} />, { settings: { target: "_self" } });
+    expect(screen.getByText("Hello there")).toBeInTheDocument();
+  });
+});