MDL-32471 adding preview generation unit tests

The test image is a public domain file from
http://commons.wikimedia.org/wiki/File:Easter_eggs_-_onion_decoration.jpg

lib/filestorage/tests/file_storage_test.php

@@ -0,0 +1,80 @@
+<?php
+
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Unit tests for /lib/filestorage/file_storage.php
+ *
+ * @package   core
+ * @category  test
+ * @copyright 2012 David Mudrak <david@moodle.com>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->libdir . '/filelib.php');
+
+class filestoragelib_testcase extends advanced_testcase {
+
+    /**
+     * Local files can be added to the filepool
+     */
+    public function test_create_file_from_pathname() {
+        global $CFG;
+
+        $this->resetAfterTest(false);
+
+        $filepath = $CFG->dirroot.'/lib/filestorage/tests/fixtures/testimage.jpg';
+        $syscontext = context_system::instance();
+        $filerecord = array(
+            'contextid' => $syscontext->id,
+            'component' => 'core',
+            'filearea'  => 'unittest',
+            'itemid'    => 0,
+            'filepath'  => '/images/',
+            'filename'  => 'testimage.jpg',
+        );
+
+        $fs = get_file_storage();
+        $fs->create_file_from_pathname($filerecord, $filepath);
+
+        $this->assertTrue($fs->file_exists($syscontext->id, 'core', 'unittest', 0, '/images/', 'testimage.jpg'));
+
+        return $fs->get_file($syscontext->id, 'core', 'unittest', 0, '/images/', 'testimage.jpg');
+    }
+
+    /**
+     * Local images can be added to the filepool and their preview can be obtained
+     *
+     * @depends test_create_file_from_pathname
+     */
+    public function test_get_file_preview(stored_file $file) {
+        global $CFG;
+
+        $this->resetAfterTest(true);
+        $fs = get_file_storage();
+
+        $previewtinyicon = $fs->get_file_preview($file, 'tinyicon');
+        $this->assertInstanceOf('stored_file', $previewtinyicon);
+        $this->assertEquals('6b9864ae1536a8eeef54e097319175a8be12f07c', $previewtinyicon->get_filename());
+
+        $previewtinyicon = $fs->get_file_preview($file, 'thumb');
+        $this->assertInstanceOf('stored_file', $previewtinyicon);
+        $this->assertEquals('6b9864ae1536a8eeef54e097319175a8be12f07c', $previewtinyicon->get_filename());
+    }
+}

phpunit.xml.dist

@@ -29,6 +29,9 @@
             <directory suffix="_test.php">lib/ajax/tests</directory>
             <directory suffix="_test.php">lib/form/tests</directory>
         </testsuite>
+        <testsuite name="core_files">
+            <directory suffix="_test.php">lib/filestorage/tests</directory>
+        </testsuite>
         <testsuite name="core_grade">
             <directory suffix="_test.php">lib/grade/tests</directory>
             <directory suffix="_test.php">grade/tests</directory>