Fix most of Terminal.api timing issues

test/api/TestUtils.ts

@@ -4,21 +4,24 @@
  */
 
 import * as puppeteer from 'puppeteer';
+import deepEqual = require('deep-equal');
 
 export async function pollFor<T>(page: puppeteer.Page, evalOrFn: string | (() => Promise<T>), val: T, preFn?: () => Promise<void>): Promise<void> {
   if (preFn) {
     await preFn();
   }
   const result = typeof evalOrFn === 'string' ? await page.evaluate(evalOrFn) : await evalOrFn();
-  let equal = false;
-  if (typeof result === 'object') {
-    equal = Object.keys(result).every(e => result[e] === (val as any)[e]);
-  } else {
-    equal = result === val;
-  }
-  if (!equal) {
+  if (!deepEqual(result, val)) {
     return new Promise<void>(r => {
       setTimeout(() => r(pollFor(page, evalOrFn, val, preFn)), 10);
     });
   }
 }
+
+export async function writeSync(page: puppeteer.Page, data: string): Promise<void> {
+  await page.evaluate(`
+    window.ready = false;
+    window.term.write('${data}', () => window.ready = true);
+  `);
+  await pollFor(page, 'window.ready', true);
+}