function ChainedFastBackendTest::testLastWriteTimestampMissing

Tests last_write_timestamp missing from the consistent backend.

File

core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php, line 248

Class

ChainedFastBackendTest

Tests Drupal\Core\Cache\ChainedFastBackend.

Namespace

Code

public function testLastWriteTimestampMissing() : void {
  $timestamp_cid = ChainedFastBackend::LAST_WRITE_TIMESTAMP_PREFIX . 'cache_foo';
  $cache_item = (object) [
    'cid' => 'foo',
    'data' => 'baz',
    'created' => time(),
    'expire' => time() + 3600,
    'tags' => [
      'tag',
    ],
  ];
  $consistent_cache = $this->createMock(CacheBackendInterface::class);
  $fast_cache = $this->createMock(CacheBackendInterface::class);
  // Simulate the last_write_timestamp being unset on the consistent backend.
  $consistent_cache->expects($this->once())
    ->method('get')
    ->with($timestamp_cid)
    ->willReturn(NULL);
  // Because the last_write_timestamp was missing, it will be newly set on the
  // consistent backend.
  $consistent_cache->expects($this->once())
    ->method('set')
    ->with($timestamp_cid);
  $consistent_cache->expects($this->once())
    ->method('getMultiple')
    ->with([
    $cache_item->cid,
  ])
    ->willReturn([
    $cache_item->cid => $cache_item,
  ]);
  // We should not get a call for the cache item on the fast backend but
  // because the last_write_timestamp is now in place, the item from the
  // consistent backend should be written back.
  $fast_cache->expects($this->never())
    ->method('getMultiple');
  $fast_cache->expects($this->once())
    ->method('set')
    ->with($cache_item->cid);
  $chained_fast_backend = new ChainedFastBackend($consistent_cache, $fast_cache, 'foo');
  $this->assertEquals('baz', $chained_fast_backend->get('foo')->data);
}