create session object to scope a user, move helper methods there

src/tests/consent.js

@@ -0,0 +1,27 @@
+/*
+Copyright 2018 New Vector Ltd
+
+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.
+*/
+
+const assert = require('assert');
+
+module.exports = async function acceptTerms(session) {
+  const reviewTermsButton = await session.waitAndQuerySelector('.mx_QuestionDialog button.mx_Dialog_primary', 5000);
+  const termsPagePromise = session.waitForNewPage();
+  await reviewTermsButton.click();
+  const termsPage = await termsPagePromise;
+  const acceptButton = await termsPage.$('input[type=submit]');
+  await acceptButton.click();
+  await session.delay(500); //TODO yuck, timers
+}