diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
new file mode 100644
index 0000000..29553ab
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,32 @@
+---
+name: Bug report
+about: Create a report to help me improve Gapfill
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.
diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
new file mode 100644
index 0000000..a85790b
--- /dev/null
+++ b/.github/workflows/moodle-ci.yml
@@ -0,0 +1,114 @@
+name: Moodle plugin CI
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: 'ubuntu-latest'
+    services:
+      postgres:
+        image: postgres:13
+        env:
+          POSTGRES_USER: 'postgres'
+          POSTGRES_HOST_AUTH_METHOD: 'trust'
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 3
+      mariadb:
+        image: mariadb:10
+        env:
+          MYSQL_USER: 'root'
+          MYSQL_ALLOW_EMPTY_PASSWORD: "true"
+          MYSQL_CHARACTER_SET_SERVER: "utf8mb4"
+          MYSQL_COLLATION_SERVER: "utf8mb4_unicode_ci"
+
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval 10s --health-timeout 5s --health-retries 3
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - php: '8.1'
+            moodle-branch: 'MOODLE_404_STABLE'
+            database: 'mariadb'
+          # - php: '8.1'
+          #   moodle-branch: 'master'
+          #   database: 'pgsql'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: plugin
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: ${{ matrix.extensions }}
+          ini-values: max_input_vars=5000
+          # none to use phpdbg fallback. Specify pcov (Moodle 3.10 and up) or xdebug to use them instead.
+          coverage: none
+
+      - name: Deploy moodle-plugin-ci
+        run: |
+          composer create-project -n --no-dev --prefer-dist moodlehq/moodle-plugin-ci ci ^3
+          # Add dirs to $PATH
+          echo $(cd ci/bin; pwd) >> $GITHUB_PATH
+          echo $(cd ci/vendor/bin; pwd) >> $GITHUB_PATH
+          # PHPUnit depends on en_AU.UTF-8 locale
+          sudo locale-gen en_AU.UTF-8
+
+      - name: Install Moodle
+        # Need explicit IP to stop mysql client fail on attempt to use unix socket.
+        run: moodle-plugin-ci install --plugin ./plugin --db-host=127.0.0.1
+        env:
+          DB: ${{ matrix.database }}
+          MOODLE_BRANCH: ${{ matrix.moodle-branch }}
+          IGNORE_PATHS: 'templates/local/mobile'
+
+      - name: PHP Lint
+        if: ${{ always() }}
+        run: moodle-plugin-ci phplint
+
+      - name: PHP Copy/Paste Detector
+        continue-on-error: true # This step will show errors but will not fail
+        if: ${{ always() }}
+        run: moodle-plugin-ci phpcpd
+
+      - name: PHP Mess Detector
+        continue-on-error: true # This step will show errors but will not fail
+        if: ${{ always() }}
+        run: moodle-plugin-ci phpmd
+
+      - name: Moodle Code Checker
+        if: ${{ always() }}
+        run: moodle-plugin-ci codechecker --max-warnings 0
+
+      - name: Moodle PHPDoc Checker
+        if: ${{ always() }}
+        run: moodle-plugin-ci phpdoc
+
+      - name: Validating
+        if: ${{ always() }}
+        run: moodle-plugin-ci validate
+
+      - name: Check upgrade savepoints
+        if: ${{ always() }}
+        run: moodle-plugin-ci savepoints
+
+      - name: Mustache Lint
+        if: ${{ always() }}
+        run: moodle-plugin-ci mustache
+
+      - name: Grunt
+        if: ${{ matrix.moodle-branch == 'master' }}
+        run: moodle-plugin-ci grunt
+
+      - name: PHPUnit tests
+        if: ${{ always() }}
+        run: moodle-plugin-ci phpunit
+
+      - name: Behat features
+        if: ${{ always() }}
+        run: moodle-plugin-ci behat --profile chrome
diff --git a/classes/helper.php b/classes/helper.php
index 7d2ea8a..d7e9b63 100644
--- a/classes/helper.php
+++ b/classes/helper.php
@@ -40,7 +40,7 @@ public static function bulk_tag_questions($fromform) {
             $questions = $DB->get_records_sql($sql, $params);
 
             foreach ($questions as $question) {
-                    if (!$fromform->replacetags) {
+                if (!$fromform->replacetags) {
                     $existingtags = \core_tag_tag::get_item_tags('core_question', 'question', $question->id);
                     foreach ($existingtags as $tag) {
                         $tags[] = $tag->get_display_name();
@@ -50,7 +50,7 @@ public static function bulk_tag_questions($fromform) {
             }
 
         }
-        }
+    }
 
 
 
diff --git a/classes/output/form/bulk_tags_form.php b/classes/output/form/bulk_tags_form.php
index 466459e..7a67f35 100644
--- a/classes/output/form/bulk_tags_form.php
+++ b/classes/output/form/bulk_tags_form.php
@@ -38,7 +38,7 @@ class bulk_tags_form extends \moodleform {
     protected function definition() {
         $mform = $this->_form;
 
-        // Add hidden form fields
+        // Add hidden form fields.
         $mform->addElement('hidden', 'tagsquestionsselected');
         $mform->setType('tagsquestionsselected', PARAM_TEXT);
         $mform->addElement('hidden', 'returnurl');
@@ -48,7 +48,6 @@ protected function definition() {
         $mform->addElement('hidden', 'courseid');
         $mform->setType('courseid', PARAM_INT);
 
-
         $mform->addElement(
             'tags',
             'formtags',
@@ -56,7 +55,7 @@ protected function definition() {
             [
                 'itemtype' => 'question',
                 'component' => 'core_question',
-                'default' => 'bicycle'
+                'default' => 'bicycle',
             ]
         );
         $mform->addElement('advcheckbox', 'replacetags', get_string('replacetags', 'qbank_bulktags'));
@@ -92,8 +91,7 @@ public function set_data($data) {
      */
     public function validation($data, $files) {
         if (count($data['formtags']) < 1) {
-            // return ['formtags' => get_string('error:no_tags_selected', 'qbank_bulktags')];
-            return ['formtags' => 'Nothing selected'];
+            return ['formtags' => get_string('error:no_tags_selected', 'qbank_bulktags')];
         } else {
             return [];
         }
diff --git a/classes/plugin_feature.php b/classes/plugin_feature.php
index 2ae82ef..fd30073 100644
--- a/classes/plugin_feature.php
+++ b/classes/plugin_feature.php
@@ -16,7 +16,6 @@
 
 namespace qbank_bulktags;
 use core_question\local\bank\plugin_features_base;
-use core_question\local\bank\bulk_action_base;
 
 /**
  * Class columns is the entrypoint for the columns.
diff --git a/tests/helper_test.php b/tests/helper_test.php
new file mode 100644
index 0000000..03b430d
--- /dev/null
+++ b/tests/helper_test.php
@@ -0,0 +1,79 @@
+<?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/>.
+
+namespace qbank_bulktags\tests;
+
+defined('MOODLE_INTERNAL') || die();
+
+use qbank_bulktags\helper;
+use advanced_testcase;
+
+/**
+ * Test class for the helper class.
+ */
+class helper_test extends advanced_testcase {
+    /**
+     * Summary of question1
+     * @var $question1 \stdClass
+     */
+    public $question1;
+
+    /**
+     * Summary of question2
+     * @var $question2 \stdClass
+     */
+    public $question2;
+    public function setUp(): void {
+        $category = $this->getDataGenerator()->create_category();
+        $course = $this->getDataGenerator()->create_course(['category' => $category->id]);
+        $coursecontext = \context_course::instance($course->id);
+        $generator = $this->getDataGenerator()->get_plugin_generator('core_question');
+        $qcat = $generator->create_question_category(['contextid' => $coursecontext->id]);
+        $this->question1 = $generator->create_question('multichoice', null, ['category' => $qcat->id]);
+        $this->question2 = $generator->create_question('multichoice', null, ['category' => $qcat->id]);
+    }
+
+    public function test_process_question_ids(): void {
+        $this->resetAfterTest();
+        $rawquestions = (object)[
+            'q' . $this->question1->id => "1",
+            'q' . $this->question2->id => "1",
+        ];
+        [$questionids, $questionlist] = helper::process_question_ids($rawquestions);
+        $this->assertTrue(count($questionids) == 2);
+        $this->assertTrue(count(explode(',', $questionlist)) == 2);
+    }
+    public function test_bulk_tag_questions(): void {
+        $this->resetAfterTest();
+        $existingtags = \core_tag_tag::get_item_tags('core_question', 'question', $this->question1->id);
+        $this->assertEmpty($existingtags);
+        $existingtags = \core_tag_tag::get_item_tags('core_question', 'question', $this->question2->id);
+        $this->assertEmpty($existingtags);
+
+        $fromform = (object) [
+            'tags' => ['tag1', 'tag2'],
+            'tagsquestionsselected' => implode(",", [$this->question1->id, $this->question2->id]),
+            'formtags' => ['foo', 'bar'],
+            'replacetags' => 0,
+        ];
+        helper::bulk_tag_questions($fromform);
+        $updatedtags = \core_tag_tag::get_item_tags('core_question', 'question', $this->question1->id);
+        $this->assertNotEmpty($updatedtags);
+
+        $updatedtags = \core_tag_tag::get_item_tags('core_question', 'question', $this->question2->id);
+        $this->assertNotEmpty($updatedtags);
+    }
+}