// Test with empty prefix
        jarFiles = ResourceUtil.getJarFiles("");
        assertNotNull(jarFiles);
        assertEquals(0, jarFiles.length);
    }

    public void test_getPluginJarFiles_withPrefix() {
        File[] pluginFiles = ResourceUtil.getPluginJarFiles("plugin");
        assertNotNull(pluginFiles);
        // Should return empty array when plugin directory doesn't exist