added basic test for preserve-scroll modifier

Author: michaelchadwick

packages/test-app/tests/integration/modifiers/preserve-scroll-test.gjs

@@ -0,0 +1,18 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'test-app/tests/helpers';
+import { render } from '@ember/test-helpers';
+import preserveScroll from 'ilios-common/modifiers/preserve-scroll';
+
+module('Integration | Modifier | preserve-scroll', function (hooks) {
+  setupRenderingTest(hooks);
+
+  test('it renders', async function (assert) {
+    await render(
+      <template>
+        <div {{preserveScroll}}></div>
+      </template>,
+    );
+
+    assert.ok(true);
+  });
+});