Adds in the functionality to delete db backups.

src/Commands/DbBackupCommand.php

@@ -266,4 +266,30 @@ function (
         $this->writeln(PHP_EOL);
         $this->say(sprintf('Database backup downloaded to %s', $location));
     }
+
+    /**
+     * Deletes a database backup.
+     *
+     * @param string $uuid
+     * @param string $environment
+     * @param string $dbName
+     * @param int    $backupId
+     *
+     * @command database:backup:delete
+     * @aliases db:backup:delete
+     */
+    public function dbBackupDelete(DatabaseBackups $databaseBackupsAdapter, $uuid, $environment, $dbName, $backupId)
+    {
+        $environment = $this->cloudapiService->getEnvironment($uuid, $environment);
+
+        if (
+            $this->confirm(
+                sprintf('Are you sure you want to delete backup id %s in %s?', $backupId, $environment->label)
+            )
+        ) {
+            $this->say(sprintf('Deleting backup %s to %s on %s', $backupId, $dbName, $environment->label));
+            $response = $databaseBackupsAdapter->delete($environment->uuid, $dbName, $backupId);
+            $this->waitForNotification($response);
+        }
+    }
 }

tests/AcquiaCliTestCase.php

@@ -351,6 +351,9 @@ public static function getFixtureMap()
                 'get' => 'Logs/downloadLog.dat',
                 'post' => 'Logs/createLogSnapshot.json'
             ],
+            '/environments/24-a47ac10b-58cc-4372-a567-0e02b2c3d470/databases/dbName/backups/1234' => [
+                'delete' => 'DatabaseBackups/deleteDatabaseBackup.json'
+            ],
             '/ides/215824ff-272a-4a8c-9027-df32ed1d68a9' => [
                 'delete' => 'Ides/deleteIde.json'
             ],

tests/Commands/DbBackupCommandTest.php

@@ -120,6 +120,10 @@ public function dbBackupProvider()
                 ['database:backup:link', 'devcloud:devcloud2', 'dev', 'dbName', '1234'],
                 $dbLink . PHP_EOL
             ],
+            [
+                ['database:backup:delete', 'devcloud:devcloud2', 'dev', 'dbName', '1234'],
+                '>  Deleting backup 1234 to dbName on Dev' . PHP_EOL
+            ],
         ];
     }
 }