diff --git a/tests/unit/mixins/ui-service-mixin-test.js b/tests/unit/mixins/ui-service-mixin-test.js
new file mode 100644
index 00000000..ccb18aa2
--- /dev/null
+++ b/tests/unit/mixins/ui-service-mixin-test.js
@@ -0,0 +1,129 @@
+/* eslint-disable ember/no-mixins, ember/no-new-mixins, ember/no-classic-classes */
+
+import EmberObject from '@ember/object';
+import Evented from '@ember/object/evented';
+import UiServiceMixin, {
+  CURRENT_REQUEST_KEY,
+} from 'torii/mixins/ui-service-mixin';
+import PopupIdSerializer from 'torii/lib/popup-id-serializer';
+import { module, test } from 'qunit';
+
+module('Unit | Mixin | ui-service-mixin', function (hooks) {
+  const originalWindowOpen = window.open;
+
+  const popupId = '09123-asdf';
+  const expectedUrl = 'http://authServer';
+  const expectedRedirectUrl = 'http://localserver?code=fr';
+  const expectedMessage = 'getPendingRequestKey';
+
+  const mockWindowListener = (event) => {
+    let msg;
+    try {
+      msg = JSON.parse(event.data);
+    } catch {
+      // allow
+    }
+    if (msg && Object.keys(msg)[0] === 'pendingRequestKey') {
+      const obj = {};
+      const key = PopupIdSerializer.serialize(encodeURIComponent(popupId));
+      obj[key] = `${expectedUrl}?redirect_url=${expectedRedirectUrl}`;
+      window.dispatchEvent(
+        new MessageEvent('message', {
+          data: JSON.stringify(obj),
+          source: window,
+        })
+      );
+    }
+  };
+
+  const buildMockWindow = function (windowName) {
+    windowName = windowName || '';
+    window.addEventListener('message', mockWindowListener);
+    return {
+      name: windowName,
+      focus() {},
+      close() {},
+      open() {
+        this.postMessage(expectedMessage);
+      },
+      postMessage(msg) {
+        window.dispatchEvent(
+          new MessageEvent('message', { data: msg, source: window })
+        );
+      },
+    };
+  };
+
+  const buildPopupIdGenerator = function (popupId) {
+    return {
+      generate() {
+        return popupId;
+      },
+    };
+  };
+
+  let Popup = EmberObject.extend(Evented, UiServiceMixin, {
+    // Open a popup window.
+    openRemote(_url, pendingRequestKey) {
+      this.remote = buildMockWindow(pendingRequestKey);
+      this.remote.open();
+    },
+
+    closeRemote() {
+      this.remote.closed = true;
+    },
+
+    pollRemote() {
+      if (!this.remote) {
+        return;
+      }
+    }
+  });
+
+  let popup;
+
+  hooks.beforeEach(function () {
+    popup = Popup.create({ remoteIdGenerator: buildPopupIdGenerator(popupId) });
+    localStorage.removeItem(CURRENT_REQUEST_KEY);
+  });
+
+  hooks.afterEach(async function () {
+    localStorage.removeItem(CURRENT_REQUEST_KEY);
+    window.open = originalWindowOpen;
+    window.removeEventListener('message', mockWindowListener);
+    popup.destroy();
+  });
+
+  test('requests pending request key', function (assert) {
+    assert.expect(1);
+
+    let resultMessage;
+    const resultMessageListener = (event) => {
+      resultMessage = event.data;
+    };
+    try {
+      window.addEventListener('message', resultMessageListener);
+
+      popup.openRemote(expectedUrl, CURRENT_REQUEST_KEY);
+
+      assert.strictEqual(
+        resultMessage,
+        expectedMessage,
+        'requests pendingRequestKey'
+      );
+    } finally {
+      window.removeEventListener('message', resultMessageListener);
+    }
+  });
+
+  test('returns data after receiving key', async function (assert) {
+    const keys = ['redirect_url'];
+    const result = await popup.open(expectedUrl, keys);
+
+    assert.strictEqual(
+      result.redirect_url,
+      expectedRedirectUrl,
+      'returns data successfully'
+    );
+  });
+});