diff --git a/course/tests/category_hooks_test.php b/course/tests/category_hooks_test.php
new file mode 100644
index 00000000000..52af5f710d7
--- /dev/null
+++ b/course/tests/category_hooks_test.php
@@ -0,0 +1,215 @@
+<?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 class core_course_category methods invoking hooks.
+ *
+ * @package    core_course
+ * @category   test
+ * @copyright  2020 Ruslan Kabalin
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace tests\core_course;
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->dirroot . '/course/tests/fixtures/mock_hooks.php');
+
+use PHPUnit\Framework\MockObject\MockObject;
+
+/**
+ * Functional test for class core_course_category methods invoking hooks.
+ */
+class core_course_category_hooks_testcase extends \advanced_testcase {
+
+    protected function setUp() {
+        $this->resetAfterTest();
+        $this->setAdminUser();
+    }
+
+    /**
+     * Provides mocked category configured for named callback function.
+     *
+     * get_plugins_callback_function will return callable prefixed with `tool_unittest_`,
+     * the actual callbacks are defined in mock_hooks.php fixture file.
+     *
+     * @param core_course_category $category Category to mock
+     * @param string $callback Callback function used in method we test.
+     * @return MockObject
+     */
+    public function get_mock_category(\core_course_category $category, string $callback = '') : MockObject {
+        // Setup mock object for \core_course_category.
+        // Disable original constructor, since we can't use it directly since it is private.
+        $mockcategory = $this->getMockBuilder(\core_course_category::class)
+            ->setMethods(['get_plugins_callback_function'])
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        // Define get_plugins_callback_function use and return value.
+        if (!empty($callback)) {
+            $mockcategory->method('get_plugins_callback_function')
+                ->with($this->equalTo($callback))
+                ->willReturn(['tool_unittest_' . $callback]);
+        }
+
+        // Modify constructor visibility and invoke mock object with real object.
+        // This is used to overcome private constructor.
+        $reflected = new \ReflectionClass(\core_course_category::class);
+        $constructor = $reflected->getConstructor();
+        $constructor->setAccessible(true);
+        $constructor->invoke($mockcategory, $category->get_db_record());
+
+        return $mockcategory;
+    }
+
+    public function test_can_course_category_delete_hook() {
+        $category1 = \core_course_category::create(array('name' => 'Cat1'));
+        $category2 = \core_course_category::create(array('name' => 'Cat2', 'parent' => $category1->id));
+        $category3 = \core_course_category::create(array('name' => 'Cat3'));
+
+        $mockcategory2 = $this->get_mock_category($category2, 'can_course_category_delete');
+
+        // Add course to mocked clone of category2.
+        $course1 = $this->getDataGenerator()->create_course(array('category' => $mockcategory2->id));
+
+        // Now configure fixture to return false for the callback.
+        mock_hooks::set_can_course_category_delete_return(false);
+        $this->assertFalse($mockcategory2->can_delete_full($category3->id));
+
+        // Now configure fixture to return true for the callback.
+        mock_hooks::set_can_course_category_delete_return(true);
+        $this->assertTrue($mockcategory2->can_delete_full($category3->id));
+
+        // Verify passed arguments.
+        $arguments = mock_hooks::get_calling_arguments();
+        $this->assertCount(1, $arguments);
+
+        // Argument 1 is the same core_course_category instance.
+        $argument = array_shift($arguments);
+        $this->assertSame($mockcategory2, $argument);
+    }
+
+    public function test_can_course_category_delete_move_hook() {
+        $category1 = \core_course_category::create(array('name' => 'Cat1'));
+        $category2 = \core_course_category::create(array('name' => 'Cat2', 'parent' => $category1->id));
+        $category3 = \core_course_category::create(array('name' => 'Cat3'));
+
+        $mockcategory2 = $this->get_mock_category($category2, 'can_course_category_delete_move');
+
+        // Add course to mocked clone of category2.
+        $course1 = $this->getDataGenerator()->create_course(array('category' => $mockcategory2->id));
+
+        // Now configure fixture to return false for the callback.
+        mock_hooks::set_can_course_category_delete_move_return(false);
+        $this->assertFalse($mockcategory2->can_move_content_to($category3->id));
+
+        // Now configure fixture to return true for the callback.
+        mock_hooks::set_can_course_category_delete_move_return(true);
+        $this->assertTrue($mockcategory2->can_move_content_to($category3->id));
+
+        // Verify passed arguments.
+        $arguments = mock_hooks::get_calling_arguments();
+        $this->assertCount(2, $arguments);
+
+        // Argument 1 is the same core_course_category instance.
+        $argument = array_shift($arguments);
+        $this->assertSame($mockcategory2, $argument);
+
+        // Argument 2 is referring to category 3.
+        $argument = array_shift($arguments);
+        $this->assertInstanceOf(\core_course_category::class, $argument);
+        $this->assertEquals($category3->id, $argument->id);
+    }
+
+    public function test_pre_course_category_delete_hook() {
+        $category1 = \core_course_category::create(array('name' => 'Cat1'));
+        $category2 = \core_course_category::create(array('name' => 'Cat2', 'parent' => $category1->id));
+
+        $mockcategory2 = $this->get_mock_category($category2, 'pre_course_category_delete');
+        $mockcategory2->delete_full();
+
+        // Verify passed arguments.
+        $arguments = mock_hooks::get_calling_arguments();
+        $this->assertCount(1, $arguments);
+
+        // Argument 1 is the category object.
+        $argument = array_shift($arguments);
+        $this->assertEquals($mockcategory2->get_db_record(), $argument);
+    }
+
+    public function test_pre_course_category_delete_move_hook() {
+        $category1 = \core_course_category::create(array('name' => 'Cat1'));
+        $category2 = \core_course_category::create(array('name' => 'Cat2', 'parent' => $category1->id));
+        $category3 = \core_course_category::create(array('name' => 'Cat3'));
+
+        $mockcategory2 = $this->get_mock_category($category2, 'pre_course_category_delete_move');
+
+        // Add course to mocked clone of category2.
+        $course1 = $this->getDataGenerator()->create_course(array('category' => $mockcategory2->id));
+
+        $mockcategory2->delete_move($category3->id);
+
+        // Verify passed arguments.
+        $arguments = mock_hooks::get_calling_arguments();
+        $this->assertCount(2, $arguments);
+
+        // Argument 1 is the same core_course_category instance.
+        $argument = array_shift($arguments);
+        $this->assertSame($mockcategory2, $argument);
+
+        // Argument 2 is referring to category 3.
+        $argument = array_shift($arguments);
+        $this->assertInstanceOf(\core_course_category::class, $argument);
+        $this->assertEquals($category3->id, $argument->id);
+    }
+
+    public function test_get_course_category_contents_hook() {
+        $category1 = \core_course_category::create(array('name' => 'Cat1'));
+        $category2 = \core_course_category::create(array('name' => 'Cat2', 'parent' => $category1->id));
+
+        $mockcategory2 = $this->get_mock_category($category2);
+
+        // Define get_plugins_callback_function use in the mock, it is called twice for different callback in the form.
+        $mockcategory2->expects($this->exactly(2))
+            ->method('get_plugins_callback_function')
+            ->withConsecutive(
+                [$this->equalTo('can_course_category_delete')],
+                [$this->equalTo('get_course_category_contents')]
+            )
+            ->willReturn(
+                ['tool_unittest_can_course_category_delete'],
+                ['tool_unittest_get_course_category_contents']
+            );
+
+        // Now configure fixture to return string for the callback.
+        $content = 'Bunch of test artefacts';
+        mock_hooks::set_get_course_category_contents_return($content);
+
+        $mform = new \core_course_deletecategory_form(null, $mockcategory2);
+        $this->expectOutputRegex("/<li>$content<\/li>/");
+        $mform->display();
+
+        // Verify passed arguments.
+        $arguments = mock_hooks::get_calling_arguments();
+        $this->assertCount(1, $arguments);
+
+        // Argument 1 is the same core_course_category instance.
+        $argument = array_shift($arguments);
+        $this->assertSame($mockcategory2, $argument);
+    }
+}
diff --git a/course/tests/fixtures/mock_hooks.php b/course/tests/fixtures/mock_hooks.php
new file mode 100644
index 00000000000..d5fc095ef8c
--- /dev/null
+++ b/course/tests/fixtures/mock_hooks.php
@@ -0,0 +1,184 @@
+<?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/>.
+
+/**
+ * Fixture for mocking callbacks used in \core_course_category
+ *
+ * @package    core_course
+ * @category   test
+ * @copyright  2020 Ruslan Kabalin
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace tests\core_course {
+
+    /**
+     * Class mock_hooks
+     *
+     * @package    core_course
+     * @category   test
+     * @copyright  2020 Ruslan Kabalin
+     * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+     */
+    class mock_hooks {
+        /** @var bool $cancoursecategorydelete */
+        private static $cancoursecategorydelete = true;
+
+        /** @var bool $cancoursecategorydeletemove */
+        private static $cancoursecategorydeletemove = true;
+
+        /** @var string $getcoursecategorycontents */
+        private static $getcoursecategorycontents = '';
+
+        /** @var array $callingarguments */
+        private static $callingarguments = [];
+
+        /**
+         * Set calling arguments.
+         *
+         * This is supposed to be used in the callbacks to store arguments passed to callback.
+         *
+         * @param array $callingarguments
+         */
+        public static function set_calling_arguments($callingarguments) {
+            self::$callingarguments = $callingarguments;
+        }
+
+        /**
+         * Get calling arguments.
+         *
+         * This is supposed to be used in the test to verify arguments passed to callback.
+         * This method also reset stored calling arguments.
+         *
+         * @return array $callingarguments
+         */
+        public static function get_calling_arguments() {
+            $callingarguments = self::$callingarguments;
+            self::$callingarguments = [];
+            return $callingarguments;
+        }
+
+        /**
+         * Get can_course_category_delete callback return.
+         *
+         * @return bool
+         */
+        public static function get_can_course_category_delete_return() : bool {
+            return self::$cancoursecategorydelete;
+        }
+
+        /**
+         * Sets can_course_category_delete callback return.
+         *
+         * @param bool $return
+         */
+        public static function set_can_course_category_delete_return(bool $return) {
+            self::$cancoursecategorydelete = $return;
+        }
+
+        /**
+         * Get can_course_category_delete_move callback return.
+         *
+         * @return bool
+         */
+        public static function get_can_course_category_delete_move_return() : bool {
+            return self::$cancoursecategorydeletemove;
+        }
+
+        /**
+         * Sets can_course_category_delete_move callback return.
+         *
+         * @param bool $return
+         */
+        public static function set_can_course_category_delete_move_return(bool $return) {
+            self::$cancoursecategorydeletemove = $return;
+        }
+
+        /**
+         * Get get_course_category_contents callback return.
+         *
+         * @return string
+         */
+        public static function get_get_course_category_contents_return() : string {
+            return self::$getcoursecategorycontents;
+        }
+
+        /**
+         * Sets get_course_category_contents callback return.
+         *
+         * @param string $return
+         */
+        public static function set_get_course_category_contents_return(string $return) {
+            self::$getcoursecategorycontents = $return;
+        }
+    }
+}
+
+namespace {
+
+    /**
+     * Test pre_course_category_delete callback.
+     *
+     * @param object $category
+     */
+    function tool_unittest_pre_course_category_delete(object $category) {
+        \tests\core_course\mock_hooks::set_calling_arguments(func_get_args());
+    }
+
+    /**
+     * Test pre_course_category_delete_move callback.
+     *
+     * @param core_course_category $category
+     * @param core_course_category $newcategory
+     */
+    function tool_unittest_pre_course_category_delete_move(core_course_category $category, core_course_category $newcategory) {
+        \tests\core_course\mock_hooks::set_calling_arguments(func_get_args());
+    }
+
+    /**
+     * Test can_course_category_delete callback.
+     *
+     * @param core_course_category $category
+     * @return bool
+     */
+    function tool_unittest_can_course_category_delete(core_course_category $category) {
+        \tests\core_course\mock_hooks::set_calling_arguments(func_get_args());
+        return \tests\core_course\mock_hooks::get_can_course_category_delete_return();
+    }
+
+    /**
+     * Test can_course_category_delete_move callback.
+     *
+     * @param core_course_category $category
+     * @param core_course_category $newcategory
+     * @return bool
+     */
+    function tool_unittest_can_course_category_delete_move(core_course_category $category, core_course_category $newcategory) {
+        \tests\core_course\mock_hooks::set_calling_arguments(func_get_args());
+        return \tests\core_course\mock_hooks::get_can_course_category_delete_move_return();
+    }
+
+    /**
+     * Test get_course_category_contents callback.
+     *
+     * @param core_course_category $category
+     * @return string
+     */
+    function tool_unittest_get_course_category_contents(core_course_category $category) {
+        \tests\core_course\mock_hooks::set_calling_arguments(func_get_args());
+        return \tests\core_course\mock_hooks::get_get_course_category_contents_return();
+    }
+}
\ No newline at end of file