diff --git a/lib/antivirus/clamav/tests/scanner_test.php b/lib/antivirus/clamav/tests/scanner_test.php
new file mode 100644
index 00000000000..0a81d42efbb
--- /dev/null
+++ b/lib/antivirus/clamav/tests/scanner_test.php
@@ -0,0 +1,174 @@
+<?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/>.
+
+/**
+ * Tests for ClamAV antivirus scanner class.
+ *
+ * @package    antivirus_clamav
+ * @category   phpunit
+ * @copyright  2016 Ruslan Kabalin, Lancaster University.
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+class antivirus_clamav_scanner_testcase extends advanced_testcase {
+    protected $tempfile;
+
+    protected function setUp() {
+        $this->resetAfterTest();
+
+        // Create tempfile.
+        $tempfolder = make_request_directory(false);
+        $this->tempfile = $tempfolder . '/' . rand();
+        touch($this->tempfile);
+    }
+
+    protected function tearDown() {
+        @unlink($this->tempfile);
+    }
+
+    public function test_scan_file_not_exists() {
+        $antivirus = $this->getMockBuilder('\antivirus_clamav\scanner')
+                ->setMethods(array('scan_file_execute_commandline', 'message_admins'))
+                ->getMock();
+
+        // Test specifying file that does not exist.
+        $nonexistingfile = $this->tempfile . '_';
+        $this->assertFileNotExists($nonexistingfile);
+        // Run mock scanning with deleting infected file.
+        $antivirus->scan_file($nonexistingfile, '', true);
+        $this->assertDebuggingCalled();
+    }
+
+    public function test_scan_file_no_virus() {
+        $antivirus = $this->getMockBuilder('\antivirus_clamav\scanner')
+                ->setMethods(array('scan_file_execute_commandline', 'message_admins'))
+                ->getMock();
+
+        // Configure scan_file_execute_commandline method stub to behave
+        // as if no virus has been found.
+        $antivirus->method('scan_file_execute_commandline')->willReturn(array(0, ''));
+
+        // Set expectation that message_admins is NOT called.
+        $antivirus->expects($this->never())->method('message_admins');
+
+        // Run mock scanning with deleting infected file.
+        $this->assertFileExists($this->tempfile);
+        try {
+            $antivirus->scan_file($this->tempfile, '', true);
+        } catch (\core\antivirus\scanner_exception $e) {
+            $this->fail('Exception scanner_exception is not expected in clean file scanning.');
+        }
+        // File expected to remain in place.
+        $this->assertFileExists($this->tempfile);
+    }
+
+    public function test_scan_file_virus() {
+        $antivirus = $this->getMockBuilder('\antivirus_clamav\scanner')
+                ->setMethods(array('scan_file_execute_commandline', 'message_admins'))
+                ->getMock();
+
+        // Configure scan_file_execute_commandline method stub to behave
+        // as if virus has been found.
+        $antivirus->method('scan_file_execute_commandline')->willReturn(array(1, ''));
+
+        // Set expectation that message_admins is NOT called.
+        $antivirus->expects($this->never())->method('message_admins');
+
+        // Run mock scanning without deleting infected file.
+        $this->assertFileExists($this->tempfile);
+        try {
+            $antivirus->scan_file($this->tempfile, '', false);
+        } catch (\moodle_exception $e) {
+            $this->assertInstanceOf('\core\antivirus\scanner_exception', $e);
+        }
+        // File expected to remain in place.
+        $this->assertFileExists($this->tempfile);
+
+        // Run mock scanning with deleting infected file.
+        try {
+            $antivirus->scan_file($this->tempfile, '', true);
+        } catch (\moodle_exception $e) {
+            $this->assertInstanceOf('\core\antivirus\scanner_exception', $e);
+        }
+        // File expected to be deleted.
+        $this->assertFileNotExists($this->tempfile);
+    }
+
+    public function test_scan_file_error_donothing() {
+        $antivirus = $this->getMockBuilder('\antivirus_clamav\scanner')
+                ->setMethods(array('scan_file_execute_commandline', 'message_admins', 'get_config'))
+                ->getMock();
+
+        // Configure scan_file_execute_commandline method stub to behave
+        // as if there is a scanning error.
+        $antivirus->method('scan_file_execute_commandline')->willReturn(array(2, 'someerror'));
+
+        // Set expectation that message_admins is called.
+        $antivirus->expects($this->atLeastOnce())->method('message_admins')->with($this->equalTo('someerror'));
+
+        // Initiate mock scanning with configuration setting to do nothing on scanning error.
+        $configmap = array(array('clamfailureonupload', 'donothing'));
+        $antivirus->method('get_config')->will($this->returnValueMap($configmap));
+
+        // Run mock scanning with deleting infected file.
+        $this->assertFileExists($this->tempfile);
+        try {
+            $antivirus->scan_file($this->tempfile, '', true);
+        } catch (\core\antivirus\scanner_exception $e) {
+            $this->fail('Exception scanner_exception is not expected with config setting to do nothing on error.');
+        }
+        // File expected to remain in place.
+        $this->assertFileExists($this->tempfile);
+    }
+
+    public function test_scan_file_error_actlikevirus() {
+        $antivirus = $this->getMockBuilder('\antivirus_clamav\scanner')
+                ->setMethods(array('scan_file_execute_commandline', 'message_admins', 'get_config'))
+                ->getMock();
+
+        // Configure scan_file_execute_commandline method stub to behave
+        // as if there is a scanning error.
+        $antivirus->method('scan_file_execute_commandline')->willReturn(array(2, 'someerror'));
+
+        // Set expectation that message_admins is called.
+        $antivirus->expects($this->atLeastOnce())->method('message_admins')->with($this->equalTo('someerror'));
+
+        // Initiate mock scanning with configuration setting to act like virus on scanning error.
+        $configmap = array(array('clamfailureonupload', 'actlikevirus'));
+        $antivirus->method('get_config')->will($this->returnValueMap($configmap));
+
+        // Run mock scanning without deleting infected file.
+        $this->assertFileExists($this->tempfile);
+        try {
+            $antivirus->scan_file($this->tempfile, '', false);
+        } catch (\moodle_exception $e) {
+            $this->assertInstanceOf('\core\antivirus\scanner_exception', $e);
+        }
+        // File expected to remain in place.
+        $this->assertFileExists($this->tempfile);
+
+        // Run mock scanning with deleting infected file.
+        try {
+            $antivirus->scan_file($this->tempfile, '', true);
+        } catch (\moodle_exception $e) {
+            $this->assertInstanceOf('\core\antivirus\scanner_exception', $e);
+        }
+        // File expected to be deleted.
+        $this->assertFileNotExists($this->tempfile);
+    }
+}