Tests Drupal\Core\Cache\CacheBackendInterface::delete().
public function testDelete() {
$backend = $this
->getCacheBackend();
$this
->assertIdentical(FALSE, $backend
->get('test1'), "Backend does not contain data for cache id test1.");
$backend
->set('test1', 7);
$this
->assert(is_object($backend
->get('test1')), "Backend returned an object for cache id test1.");
$this
->assertIdentical(FALSE, $backend
->get('test2'), "Backend does not contain data for cache id test2.");
$backend
->set('test2', 3);
$this
->assert(is_object($backend
->get('test2')), "Backend returned an object for cache id %cid.");
$backend
->delete('test1');
$this
->assertIdentical(FALSE, $backend
->get('test1'), "Backend does not contain data for cache id test1 after deletion.");
$cached = $backend
->get('test2');
$this
->assert(is_object($backend
->get('test2')), "Backend still has an object for cache id test2.");
$backend
->delete('test2');
$this
->assertIdentical(FALSE, $backend
->get('test2'), "Backend does not contain data for cache id test2 after deletion.");
}