/**
  * Tests several combinations, adding entries, updating and deleting.
  */
 public function testDBTNGExampleStorage()
 {
     // Create a new entry.
     $entry = array('name' => 'James', 'surname' => 'Doe', 'age' => 23);
     DBTNGExampleStorage::insert($entry);
     // Save another entry.
     $entry = array('name' => 'Jane', 'surname' => 'NotDoe', 'age' => 19);
     DBTNGExampleStorage::insert($entry);
     // Verify that 4 records are found in the database.
     $result = DBTNGExampleStorage::load();
     $this->assertEqual(count($result), 4, 'Found a total of four entries in the table after creating two additional entries.');
     // Verify 2 of these records have 'Doe' as surname.
     $result = DBTNGExampleStorage::load(array('surname' => 'Doe'));
     $this->assertEqual(count($result), 2, 'Found two entries in the table with surname = "Doe".');
     // Now find our not-Doe entry.
     $result = DBTNGExampleStorage::load(array('surname' => 'NotDoe'));
     $this->assertEqual(count($result), 1, 'Found one entry in the table with surname "NotDoe');
     // Our NotDoe will be changed to "NowDoe".
     $entry = $result[0];
     $entry->surname = "NowDoe";
     // update() returns the number of entries updated.
     $this->assertNotEqual(DBTNGExampleStorage::update((array) $entry), 0, "NotDoe updated to NowDoe.");
     $result = DBTNGExampleStorage::load(array('surname' => 'NowDoe'));
     $this->assertEqual(count($result), 1, "Found renamed 'NowDoe' surname");
     // Read only John Doe entry.
     $result = DBTNGExampleStorage::load(array('name' => 'John', 'surname' => 'Doe'));
     $this->assertEqual(count($result), 1, 'Found one entry for John Doe.');
     // Get the entry.
     $entry = (array) end($result);
     // Change age to 45.
     $entry['age'] = 45;
     // Update entry in database.
     DBTNGExampleStorage::update((array) $entry);
     // Find entries with age = 45.
     // Read only John Doe entry.
     $result = DBTNGExampleStorage::load(array('surname' => 'NowDoe'));
     $this->assertEqual(count($result), 1, 'Found one entry with surname = Nowdoe.');
     // Verify it is Jane NowDoe.
     $entry = (array) end($result);
     $this->assertEqual($entry['name'], 'Jane', 'The name Jane is found in the entry');
     $this->assertEqual($entry['surname'], 'NowDoe', 'The surname NowDoe is found in the entry');
     // Delete the entry.
     DBTNGExampleStorage::delete($entry);
     // Verify that now there are only 3 records.
     $result = DBTNGExampleStorage::load();
     $this->assertEqual(count($result), 3, 'Found only three records, a record was deleted.');
 }