diff --git a/plugins/woocommerce/changelog/add-36536-unit-test-for-onboarding-filter b/plugins/woocommerce/changelog/add-36536-unit-test-for-onboarding-filter
new file mode 100644
index 00000000000..558832fbc38
--- /dev/null
+++ b/plugins/woocommerce/changelog/add-36536-unit-test-for-onboarding-filter
@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+
+Add a unit test for woocommerce_admin_experimental_onboarding_tasklists filter
diff --git a/plugins/woocommerce/tests/legacy/unit-tests/woocommerce-admin/features/onboarding-tasks/task-lists.php b/plugins/woocommerce/tests/legacy/unit-tests/woocommerce-admin/features/onboarding-tasks/task-lists.php
new file mode 100644
index 00000000000..36bb828df25
--- /dev/null
+++ b/plugins/woocommerce/tests/legacy/unit-tests/woocommerce-admin/features/onboarding-tasks/task-lists.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * Test the TaskLists class.
+ *
+ * @package WooCommerce\Admin\Tests\OnboardingTasks
+ */
+
+/**
+ * Test task fixture.
+ */
+require_once __DIR__ . '/test-task.php';
+
+use Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskList;
+use Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists;
+
+/**
+ * Class WC_Tests_OnboardingTasks_TaskLists
+ */
+class WC_Tests_OnboardingTasks_TaskLists extends WC_Unit_Test_Case {
+	/**
+	 * Setup test data. Called before every test.
+	 */
+	public function setUp(): void {
+		parent::setUp();
+		TaskLists::clear_lists();
+	}
+
+	/**
+	 * Tests that the "woocommerce_admin_experimental_onboarding_tasklists" filter is able to append tasks to any tasklist.
+	 */
+	public function test_default_tasklists_can_be_add_by_onboarding_filter() {
+		// Filter the default task lists.
+		add_filter(
+			'woocommerce_admin_experimental_onboarding_tasklists',
+			function(
+			$task_lists
+			) {
+				$this->assertIsArray( $task_lists );
+
+				// Add a new task list.
+				$task_lists['test'] = new TaskList(
+					array(
+						'id'       => 'test',
+						'title'    => 'Test',
+						'tasks'    => array(),
+						'isHidden' => false,
+					)
+				);
+				return $task_lists;
+			}
+		);
+
+		// Initialize the default task lists.
+		TaskLists::init_default_lists();
+
+		// Assert that the new task list is added.
+		$this->assertNotEmpty( TaskLists::get_list( 'test' ) );
+	}
+}