1 files changed, 68 insertions, 0 deletions
diff --git a/testing/web-platform/tests/window-placement/resources/helpers.js b/testing/web-platform/tests/window-placement/resources/helpers.js
new file mode 100644
index 0000000000..f6acb54c26
--- /dev/null
+++ b/testing/web-platform/tests/window-placement/resources/helpers.js
@@ -0,0 +1,68 @@
+
+// Logs (appends) an HTML string to a logger element in a list format.
+// An element in the document with id "logger" will be used as the log
+// container.
+function log(str) {
+  const entry = document.createElement('li');
+  entry.innerHTML = str;
+  const loggerElement = document.getElementById('logger');
+  loggerElement.appendChild(entry);
+  return entry;
+}
+
+// Common setup for window management tests. Performs some basic assertions, and
+// then waits for a click on the `setUpButton` element (for manual tests).
+// Example usage:
+//  promise_test(async setUpTest => {
+//    await setUpWindowManagement(setUpTest, setUpButton);
+//    ...
+//  });
+async function setUpWindowManagement(setUpTest, setUpButton) {
+  assert_true(
+    'getScreenDetails' in self && 'isExtended' in screen,
+    `API not supported; use Chromium (not content_shell) and enable
+     chrome://flags/#enable-experimental-web-platform-features`);
+  if (!screen.isExtended)
+    log(`WARNING: Use multiple screens for full test coverage`);
+  if (window.location.href.startsWith('file'))
+    log(`WARNING: Run via 'wpt serve'; file URLs lack permission support`);
+
+  try {  // Support manual testing where test_driver is not running.
+    await test_driver.set_permission({ name: 'window-placement' }, 'granted');
+  } catch {
+  }
+  const setUpWatcher = new EventWatcher(setUpTest, setUpButton, ['click']);
+  const setUpClick = setUpWatcher.wait_for('click');
+  try {  // Support manual testing where test_driver is not running.
+    await test_driver.click(setUpButton);
+  } catch {
+  }
+  await setUpClick;
+  setUpButton.disabled = true;
+}
+
+
+// Adds a button to the given `buttonContainer` element with the contents of
+// `name`. Attaches an event watcher to the given test and waits for a signal
+// from the test driver to click the button. If no test driver is available
+// (manual testing) then awaits an actual click from the user instead. If
+// `disableOnClick` is true, the button will also be disabled after it is
+// clicked.
+async function addTestTriggerButtonAndAwaitClick(buttonContainer, name, test) {
+  const button = document.createElement('button');
+  button.innerHTML = name;
+  const entry = document.createElement('li');
+  entry.appendChild(button);
+  buttonContainer.appendChild(entry);
+  const testWatcher = new EventWatcher(test, button, ['click']);
+  const buttonClick = testWatcher.wait_for('click');
+  // Disable the button when it is clicked.
+  button.onclick = function() {
+    button.disabled = true;
+  };
+  try {  // Support manual testing where test_driver is not running.
+    await test_driver.click(button);
+  } catch {
+  }
+  await buttonClick;
+}