diff --git a/repository/recent/tests/lib_test.php b/repository/recent/tests/lib_test.php
new file mode 100644
index 00000000000..2e63b81fbd9
--- /dev/null
+++ b/repository/recent/tests/lib_test.php
@@ -0,0 +1,190 @@
+<?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 test for recent repository
+ *
+ * @package repository_recent
+ *
+ * @author  Nathan Nguyen <nathannguyen@catalyst-au.net>
+ * @copyright  Catalyst IT
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->dirroot . '/repository/lib.php');
+require_once($CFG->dirroot . '/files/externallib.php');
+/**
+ * Unit test for recent repository
+ *
+ * @package repository_recent
+ *
+ * @author  Nathan Nguyen <nathannguyen@catalyst-au.net>
+ * @copyright  Catalyst IT
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class repository_recent_lib_testcase extends advanced_testcase {
+
+    /** @var repository Recent repository */
+    private $repo;
+
+    /** @var context repository */
+    private $usercontext;
+
+    /**
+     * SetUp to create an repository instance.
+     */
+    protected function setUp() {
+        global $USER, $itemid;
+
+        $this->resetAfterTest(true);
+        $this->setAdminUser();
+        $this->usercontext = context_user::instance($USER->id);
+        $repoid = $this->getDataGenerator()->create_repository('recent')->id;
+        $this->repo = repository::get_repository_by_id($repoid, $this->usercontext);
+        // Set global itemid for draft file (file manager mockup).
+        $itemid = file_get_unused_draft_itemid();
+    }
+
+    /**
+     * Test get listing
+     */
+    public function test_get_listing_with_duplicate_file() {
+        global $itemid;
+
+        // No recent file.
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(0, $filelist);
+
+        // Create test file 1.
+        self::create_test_file('TestFile1', 'draft', $itemid);
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(1, $filelist);
+
+        // Due to create_test_file function, same filename means same content as the content is the filename hash.
+        self::create_test_file('TestFile1', 'private');
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(1, $filelist);
+
+        // Create test file 2, different area.
+        self::create_test_file('TestFile2', 'private');
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(2, $filelist);
+    }
+
+    /**
+     * Test get listing reference file
+     */
+    public function test_get_listing_with_reference_file() {
+        // Create test file 1.
+        $file1 = self::create_test_file('TestFile1', 'private');
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(1, $filelist);
+
+        // Create reference file.
+        $file2 = self::create_reference_file($file1, 'TestFile2', 'private');
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(1, $filelist);
+
+        // Delete reference.
+        $file2->delete_reference();
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(2, $filelist);
+    }
+
+    /**
+     * Test number limit
+     */
+    public function test_get_listing_number_limit() {
+        self::create_multiple_test_files('private', 75);
+        $filelist = $this->repo->get_listing()['list'];
+        $this->assertCount(50, $filelist);
+
+        // The number limit is set as property of the repo, so we need to create new repo instance.
+        set_config('recentfilesnumber', 100, 'recent');
+        $repoid = $this->getDataGenerator()->create_repository('recent')->id;
+        $repo = repository::get_repository_by_id($repoid, $this->usercontext);
+        $filelist = $repo->get_listing()['list'];
+        $this->assertCount(75, $filelist);
+    }
+
+    /**
+     * Create multiple test file
+     *
+     * @param string $filearea file area
+     * @param int $numberoffiles number of files to be created
+     */
+    private function create_multiple_test_files($filearea, $numberoffiles) {
+        for ($i = 0; $i < $numberoffiles; ++$i) {
+            $filename = "TestFile$i" . time();
+            self::create_test_file($filename, $filearea);
+        }
+    }
+
+    /**
+     * Create test file
+     *
+     * @param string $filename file name
+     * @param string $filearea file area
+     * @param int $itemid item id
+     * @return stored_file the newly created file
+     */
+    private function create_test_file($filename, $filearea, $itemid = 0) {
+        global $USER;
+
+        $filerecord = array();
+        $filerecord['contextid'] = $this->usercontext->id;
+        $filerecord['component'] = 'user';
+        $filerecord['filearea'] = $filearea;
+        $filerecord['itemid'] = $itemid;
+        $filerecord['filepath'] = '/';
+        $filerecord['filename'] = $filename;
+        $filerecord['userid'] = $USER->id;
+
+        $fs = get_file_storage();
+        $content = hash("md5", $filename);
+        return $fs->create_file_from_string($filerecord, $content);
+    }
+
+    /**
+     * Create reference file
+     *
+     * @param stored_file $file source file
+     * @param string $filename file name
+     * @param string $filearea file area
+     * @param int $itemid item id
+     * @return stored_file the newly created file
+     */
+    private function create_reference_file($file, $filename, $filearea, $itemid = 0) {
+        global $USER, $DB;
+
+        $newfilerecord = array();
+        $newfilerecord['contextid'] = $this->usercontext->id;
+        $newfilerecord['component'] = 'user';
+        $newfilerecord['filearea'] = $filearea;
+        $newfilerecord['itemid'] = $itemid;
+        $newfilerecord['filepath'] = '/';
+        $newfilerecord['filename'] = $filename;
+        $newfilerecord['userid'] = $USER->id;
+
+        $fs = get_file_storage();
+        $oldfilerecord = $DB->get_record('files', ['id' => $file->get_id()]);
+        $ref = $fs->pack_reference($oldfilerecord);
+        return $fs->create_file_from_reference($newfilerecord, $this->repo->id, $ref);
+    }
+}