PageAccessTest broken by 8.3.7 (SA-CORE-2017-04 fix)

The PageAccessTest unit test fails on 8.3.7 because of an unexpected call to a mocked entity:

1) Drupal\Tests\page_manager\Unit\PageAccessTest::testAccessView
Prophecy\Exception\Call\UnexpectedCallException: Method call:
  - id()
on Double\PageInterface\P19 was not expected, expected calls were:
  - getContexts()
  - getAccessConditions()
  - getAccessLogic()
  - status()
  - language()
  - uuid()
  - getEntityTypeId()

This was introduced by a patch for SA-CORE-2017-04, which added a fallback the cache ID to TYPE:ID if the entity does not have a UUID.

-    if (($return = $this->getCache($entity->uuid(), $operation, $langcode, $account)) !== NULL) {
+    // If an entity does not have a UUID, either from not being set or from not
+    // having them, use the 'entity type:ID' pattern as the cache $cid.
+    $cid = $entity->uuid() ?: $entity->getEntityTypeId() . ':' . $entity->id();

I believe the correct fix for this is to add id() to the expected methods for the mock.