tests: Basic test for `restoreRevision` API

src/tests/backend/specs/api/restoreRevision.js

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+'use strict';
+
+const assert = require('assert').strict;
+const common = require('../../common');
+const padManager = require('../../../../node/db/PadManager');
+
+describe(__filename, function () {
+  let agent;
+  let padId;
+  let pad;
+
+  const restoreRevision = async (padId, rev) => {
+    const p = new URLSearchParams(Object.entries({
+      apikey: common.apiKey,
+      padID: padId,
+      rev,
+    }));
+    const res = await agent.get(`/api/1.2.11/restoreRevision?${p}`)
+        .expect(200)
+        .expect('Content-Type', /json/);
+    assert.equal(res.body.code, 0);
+  };
+
+  before(async function () {
+    agent = await common.init();
+  });
+
+  beforeEach(async function () {
+    padId = common.randomString();
+    if (await padManager.doesPadExist(padId)) await padManager.removePad(padId);
+    pad = await padManager.getPad(padId);
+    await pad.appendText('\nfoo');
+    await pad.appendText('\nbar');
+    assert.equal(pad.head, 2);
+  });
+
+  afterEach(async function () {
+    if (await padManager.doesPadExist(padId)) await padManager.removePad(padId);
+  });
+
+  // TODO: Enable once the end-of-pad newline bugs are fixed. See:
+  // https://github.com/ether/etherpad-lite/pull/5253
+  xit('content matches', async function () {
+    const oldHead = pad.head;
+    const wantAText = await pad.getInternalRevisionAText(pad.head - 1);
+    assert(wantAText.text.endsWith('\nfoo\n'));
+    await restoreRevision(padId, pad.head - 1);
+    assert.equal(pad.head, oldHead + 1);
+    assert.deepEqual(await pad.getInternalRevisionAText(pad.head), wantAText);
+  });
+});