Add a test for showing the theme image.

Author: akademy

src/components/Footer.test.tsx

@@ -4,6 +4,7 @@ import "@testing-library/jest-dom";
 import dlsLogo from "../public/generic/logo-short.svg";
 import { Footer, FooterLink, FooterLinks } from "./Footer";
 import { ImageColorSchemeSwitch } from "./ImageColorSchemeSwitch";
+import {ThemeProvider} from "../themes/ThemeProvider";
 
 jest.mock("./ImageColorSchemeSwitch");
 // @ts-expect-error: doesn't find mockImplementation outside of testing.
@@ -17,6 +18,12 @@ describe("Footer", () => {
     // No copyright text
     expect(screen.queryByRole("paragraph")).not.toBeInTheDocument();
   });
+  
+  test("Should render logo via theme", () => {
+    render(<ThemeProvider><Footer logo="theme" /></ThemeProvider>);
+    
+    expect(screen.getByRole("img")).toBeInTheDocument();
+  });
 
   test("Should render copyright only", async () => {
     const copyrightText = "add text here";