### Question:
ReflectionUtils { public Class<?> getDeclaredFieldType(final String fieldName, final Class<?> clazz) { final String cacheKey = "FieldType-" + clazz.getName() + "-" + fieldName; return CACHE_MANAGER.getFromCache(cacheKey, Class.class).orElseGet(() -> { Class<?> fieldType = getDeclaredField(fieldName, clazz).getType(); CACHE_MANAGER.cacheObject(cacheKey, fieldType); return fieldType; }); }  Object invokeMethod(final Method method, final Object target, final Object... args); boolean isSetter(final Method method); boolean isGetter(final Method method); Object getFieldValue(final Object target, final Field field); @SuppressWarnings("unchecked") Object getFieldValue(final Object target, final String fieldName, final Class<?> fieldType); A getFieldAnnotation(final Field field, final Class<A> annotationClazz); A getParameterAnnotation(final Parameter parameter, final Class<A> annotationClazz, final String declaringClassName); Field getDeclaredField(final String fieldName, final Class<?> targetClass); Class<?> getDeclaredFieldType(final String fieldName, final Class<?> clazz); void setFieldValue(final Object target, final String fieldName, final Object fieldValue); void setFieldValue(final Object target, final Field field, final Object fieldValue); Method getSetterMethodForField(final Class<?> fieldClass, final String fieldName, final Class<?> fieldType); Class<?> getGenericFieldType(final Field field); MapType getMapGenericType(final Type fieldType, final String declaringClass, final String fieldName); Class<?> getArgumentTypeClass(final Object argument, final String declaringClass, final String fieldName, final boolean getNestedGenericClass); Class<?> getArrayType(final Field arrayField);  }### Answer:
@Test public void testGetDeclaredFieldTypeWorksProperly() { Class<?> actual = underTest.getDeclaredFieldType(ID_FIELD_NAME, FromFooSubClass.class); assertThat(actual).isNotNull(); }