Testcase for HEIC image (similar to the ImageTest)

Signed-off-by: Sebastian Steinmetz <me@sebastiansteinmetz.ch>

tests/lib/Preview/HEICTest.php

+<?php
+/**
+ * @copyright Copyright (c) 2018, Sebastian Steinmetz (me@sebastiansteinmetz.ch)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Test\Preview;
+
+/**
+ * Class BitmapTest
+ *
+ * @group DB
+ *
+ * @package Test\Preview
+ */
+class HEICTest extends Provider {
+
+	public function setUp() {
+		parent::setUp();
+
+		$fileName = 'testimage.heic';
+		$this->imgPath = $this->prepareTestFile($fileName, \OC::$SERVERROOT . '/tests/data/' . $fileName);
+		$this->width = 1680;
+		$this->height = 1050;
+		$this->provider = new \OC\Preview\HEIC;
+	}
+}
\ No newline at end of file