Follow-up of #12707: Add an integration test for checkboxes as radio buttons

* Integration tests: Add a function to load a pdf and wait for a selected element
 * Integration tests: Add a function to close all the open pages

test/integration/test_utils.js

@@ -0,0 +1,36 @@
+/* Copyright 2020 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+exports.loadAndWait = (filename, selector) =>
+  Promise.all(
+    global.integrationSessions.map(async session => {
+      const page = await session.browser.newPage();
+      await page.goto(
+        `${global.integrationBaseUrl}?file=/test/pdfs/${filename}`
+      );
+      await page.bringToFront();
+      await page.waitForSelector(selector, {
+        timeout: 0,
+      });
+      return [session.name, page];
+    })
+  );
+
+exports.closePages = pages =>
+  Promise.all(
+    pages.map(async ([_, page]) => {
+      await page.close();
+    })
+  );