### Question:
ResolverUtil { protected String getPackagePath(String packageName) { return packageName == null ? null : packageName.replace('.', '/'); }  Set<Class<? extends T>> getClasses(); ClassLoader getClassLoader(); void setClassLoader(ClassLoader classloader); ResolverUtil<T> findImplementations(Class<?> parent, String... packageNames); ResolverUtil<T> findAnnotated(Class<? extends Annotation> annotation, String... packageNames); ResolverUtil<T> find(Test test, String packageName);  }### Answer:
@Test void getPackagePath() { ResolverUtil resolverUtil = new ResolverUtil(); assertNull(resolverUtil.getPackagePath(null)); assertEquals(resolverUtil.getPackagePath("org.apache.ibatis.io"), "org/apache/ibatis/io"); }