diff --git a/tests/data/surveys/survey_simple_statistics.lsa b/tests/data/surveys/survey_simple_statistics.lsa
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diff --git a/tests/unit/helpers/GenerateSimpleStatisticsTest.php b/tests/unit/helpers/GenerateSimpleStatisticsTest.php
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+++ b/tests/unit/helpers/GenerateSimpleStatisticsTest.php
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+<?php
+
+namespace ls\tests;
+
+use Yii;
+
+/**
+ * Tests for statistics_helper::generate_simple_statistics().
+ */
+class GenerateSimpleStatisticsTest extends TestBaseClass
+{
+    public static function setUpBeforeClass(): void
+    {
+        Yii::app()->loadHelper('admin/statistics');
+        Yii::app()->loadHelper('common');
+
+        parent::setUpBeforeClass();
+
+        Yii::app()->setController(new DummyController('dummyid'));
+
+        // Import survey
+        $filename = self::$surveysFolder . '/survey_simple_statistics.lsa';
+        self::importSurvey($filename);
+    }
+
+    public function testStatisticsForThreeQuestions()
+    {
+        // Form SGQA identifiers.
+        $allQuestions = \Question::model()->getQuestionList(self::$surveyId);
+        $summary = createCompleteSGQA(self::$surveyId, $allQuestions, 'en');
+
+        $helper = new \statistics_helper();
+        $statistics = $helper->generate_simple_statistics(self::$surveyId, $summary, $summary, 1, 'html', 'DD');
+
+        $doc = new \DOMDocument();
+        $doc->loadHtml($statistics);
+
+        $scripts = $doc->getElementsByTagName('script');
+
+        $scriptQ1 = trim($scripts->item(0)->nodeValue);
+        $scriptQ2 = trim($scripts->item(1)->nodeValue);
+        $scriptQ3 = trim($scripts->item(2)->nodeValue);
+
+        $questionId1 = $allQuestions[0]->qid;
+        $questionId2 = $allQuestions[1]->qid;
+        $questionId3 = $allQuestions[2]->qid;
+
+        $this->assertStringContainsString("['quid'+'" . $questionId1 . "']", $scriptQ1, 'The statistics do not contain the correct question id.');
+        $this->assertStringContainsString("[2,2,4,0]", $scriptQ1, 'The statistics values are not correct.');
+
+        $this->assertStringContainsString("['quid'+'" . $questionId2 . "']", $scriptQ2, 'The statistics do not contain the correct question id.');
+        $this->assertStringContainsString("[5,3,1,0]", $scriptQ2, 'The statistics values are not correct.');
+
+        $this->assertStringContainsString("['quid'+'" . $questionId3 . "']", $scriptQ3, 'The statistics do not contain the correct question id.');
+        $this->assertStringContainsString("[1,5,3,0]", $scriptQ3, 'The statistics values are not correct.');
+    }
+}