diff --git a/lib/tests/external/test_poll_stored_progress.php b/lib/tests/external/test_poll_stored_progress.php
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+++ b/lib/tests/external/test_poll_stored_progress.php
@@ -0,0 +1,64 @@
+<?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 core\external;
+
+/**
+ * Unit tests for poll_stored_progress
+ *
+ * @package   core
+ * @copyright 2024 onwards Catalyst IT EU {@link https://catalyst-eu.net}
+ * @author    Mark Johnson <mark.johnson@catalyst-eu.net>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @covers core\external\poll_stored_progress
+ */
+class test_poll_stored_progress extends \advanced_testcase {
+    /**
+     * Throw an exception if the wrong data type is passed for an ID.
+     */
+    public function test_execute_invalid_id(): void {
+        $debuginfo = 'Invalid external api parameter: the value is "foo", the server was expecting "int" type';
+        $pollstoredprogress = new poll_stored_progress();
+        $this->expectExceptionObject(new \invalid_parameter_exception($debuginfo));
+        $pollstoredprogress->execute(['foo']);
+    }
+
+    /**
+     * Passing a list of IDs returns a corresponding list of records.
+     */
+    public function test_execute(): void {
+        $this->resetAfterTest();
+        $generator = $this->getDataGenerator();
+        $progress1 = $generator->create_stored_progress();
+        $progress2 = $generator->create_stored_progress();
+        $falseid = $progress2->id + 1;
+
+        $ids = [
+            $progress1->id,
+            $progress2->id,
+            $falseid,
+        ];
+
+        $pollstoredprogress = new poll_stored_progress();
+        $result = $pollstoredprogress->execute($ids);
+
+        $this->assertEquals($progress1->id, $result[$progress1->id]['id']);
+        $this->assertEquals($progress1->idnumber, $result[$progress1->id]['uniqueid']);
+        $this->assertEquals($progress2->id, $result[$progress2->id]['id']);
+        $this->assertEquals($progress2->idnumber, $result[$progress2->id]['uniqueid']);
+        $this->assertEquals($falseid, $result[$falseid]['id']);
+        $this->assertEmpty($result[$falseid]['uniqueid']); // Empty when no matching record is found.
+    }
+}
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