DevTools: create test infrastructure so devtools drives the test

third_party/WebKit/LayoutTests/http/tests/inspector/devtools-js/console-clear.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+TestRunner.addResult("Tests that console is cleared upon requestClearMessages call.\n");

[dgozman, 2017/04/25 21:08:28]

nit: let's have an empty line after copyright.

[chenwilliam, 2017/06/15 01:01:05]

Done.

+
+TestRunner.loadPanels(["console"])

[chenwilliam, 2017/04/25 01:09:07]

We can make this even fancier and wrap each test script in an async function so
we could do:

await TestRunner.loadPanels['...']

It's more magical, but allows you to avoid creating a wrapper test function.
What do you think?

[dgozman, 2017/04/25 21:08:28]

I'm all for it. It would make reusing frontend for tests that much easier.

[chenwilliam, 2017/06/15 01:01:05]

Done.

+  .then(() => TestRunner.loadLazyModules(["source_frame"]))

[dgozman, 2017/04/25 21:08:28]

Why do we do this? I'd prefer this to be handled by frontend code.

[chenwilliam, 2017/06/15 01:01:05]

This was to reduce flakiness: https://codereview.chromium.org/1064853002

I think it should actually be text_editor though and not source_frame. We're
lazy loading text editor in the front_end here:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/devtools/front...

And, on second thought I don't think we even need this for this test so I've
deleted it.

+  .then(test);
+
+function log() {
+  // Fill console.
+  console.log("one");
+  console.log("two");
+  console.log("three");
+}
+
+async function test() {
+  await TestRunner.evaluateInPagePromise(`(${log.toString()})()`);
+  TestRunner.addResult("=== Before clear ===");
+  TestRunner.dumpConsoleMessages();
+
+  Console.ConsoleView.clearConsole();
+  TestRunner.deprecatedRunAfterPendingDispatches(callback);
+  function callback() {
+    TestRunner.addResult("=== After clear ===");
+    TestRunner.dumpConsoleMessages();
+    TestRunner.completeTest();
+  }
+}