assertTrue(Files.exists(nestedDir));
        themeHelper.closeQuietly(tempDir.resolve("parent"));
        assertFalse(Files.exists(tempDir.resolve("parent")));
    }

    public void test_install_withValidZip() throws IOException {
        // Create a mock zip file with theme content
        Path jarPath = tempDir.resolve("test-theme.jar");
        createMockThemeZip(jarPath);