Wrote export tests.

app/Export/Processor.php

@@ -30,7 +30,7 @@ use ZipArchive;
  *
  * @package FireflyIII\Export
  */
-class Processor
+class Processor implements ProcessorInterface
 {
 
     /** @var Collection */

app/Export/ProcessorInterface.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * ProcessorInterface.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Export;
+
+use Illuminate\Support\Collection;
+
+/**
+ * Interface ProcessorInterface
+ *
+ * @package FireflyIII\Export
+ */
+interface ProcessorInterface
+{
+
+    /**
+     * Processor constructor.
+     *
+     * @param array $settings
+     */
+    public function __construct(array $settings);
+
+    /**
+     * @return bool
+     */
+    public function collectAttachments(): bool;
+
+    /**
+     * @return bool
+     */
+    public function collectJournals(): bool;
+
+    /**
+     * @return bool
+     */
+    public function collectOldUploads(): bool;
+
+    /**
+     * @return bool
+     */
+    public function convertJournals(): bool;
+
+    /**
+     * @return bool
+     */
+    public function createZipFile(): bool;
+
+    /**
+     * @return bool
+     */
+    public function exportJournals(): bool;
+
+    /**
+     * @return Collection
+     */
+    public function getFiles(): Collection;
+}