1 files changed, 133 insertions, 0 deletions
diff --git a/devtools/server/tests/chrome/test_inspector_getImageData-wait-for-load.html b/devtools/server/tests/chrome/test_inspector_getImageData-wait-for-load.html
new file mode 100644
index 0000000000..129116b913
--- /dev/null
+++ b/devtools/server/tests/chrome/test_inspector_getImageData-wait-for-load.html
@@ -0,0 +1,133 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests for InspectorActor.getImageData() in following cases:
+ * Image takes too long to load (the method rejects after a timeout).
+ * Image is loading when the method is called and the load finishes before
+   timeout.
+ * Image fails to load.
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=1192536
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1192536</title>
+
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript" src="inspector-helpers.js"></script>
+  <script type="application/javascript">
+"use strict";
+
+const PATH = "https://example.com/chrome/devtools/server/tests/chrome/";
+const BASE_IMAGE = PATH + "inspector-delay-image-response.sjs";
+const DELAYED_IMAGE = BASE_IMAGE + "?delay=300";
+const TIMEOUT_IMAGE = BASE_IMAGE + "?delay=50000";
+const NONEXISTENT_IMAGE = PATH + "this-does-not-exist.png";
+
+window.onload = function() {
+  SimpleTest.waitForExplicitFinish();
+  runNextTest();
+};
+
+function pushPref(preferenceName, value) {
+  return new Promise(resolve => {
+    const options = {"set": [[preferenceName, value]]};
+    SpecialPowers.pushPrefEnv(options, resolve);
+  });
+}
+
+let gImg = null;
+let gNodeFront = null;
+let gWalker = null;
+
+addTest(async function setup() {
+  const url = document.getElementById("inspectorContent").href;
+  const { target, doc } = await attachURL(url);
+  const inspector = await target.getFront("inspector");
+  gWalker = inspector.walker;
+  gNodeFront = await gWalker.querySelector(gWalker.rootNode, "img.custom");
+  gImg = doc.querySelector("img.custom");
+  ok(gNodeFront, "Got the image NodeFront.");
+  ok(gImg, "Got the image Node.");
+  runNextTest();
+});
+
+addTest(async function testTimeout() {
+  info("Testing that the method aborts if the image takes too long to load.");
+
+  // imageToImageData() only times out when flags.testing is not set.
+  await pushPref("devtools.testing", false);
+
+  gImg.src = TIMEOUT_IMAGE;
+
+  info("Calling getImageData().");
+  ensureRejects(gNodeFront.getImageData(), "Timeout image").then(runNextTest);
+});
+
+addTest(async function testNonExistentImage() {
+  info("Testing that non-existent image causes a rejection.");
+
+  // This test shouldn't hit the timeout.
+  await pushPref("devtools.testing", true);
+
+  gImg.src = NONEXISTENT_IMAGE;
+
+  info("Calling getImageData().");
+  ensureRejects(gNodeFront.getImageData(), "Non-existent image").then(runNextTest);
+});
+
+addTest(async function testDelayedImage() {
+  info("Testing that the method waits for an image to load.");
+
+  // This test shouldn't hit the timeout.
+  await pushPref("devtools.testing", true);
+
+  gImg.src = DELAYED_IMAGE;
+
+  info("Calling getImageData().");
+  checkImageData(gNodeFront.getImageData()).then(runNextTest);
+});
+
+addTest(function cleanup() {
+  gImg = null;
+  gNodeFront = null;
+  gWalker = null;
+  runNextTest();
+});
+
+/**
+ * Asserts that the given promise rejects.
+ */
+function ensureRejects(promise, desc) {
+  return promise.then(() => {
+    ok(false, desc + ": promise resolved unexpectedly.");
+  }, () => {
+    ok(true, desc + ": promise rejected as expected.");
+  });
+}
+
+/**
+ * Waits for the call to getImageData() the resolve and checks that the image
+ * size is reported correctly.
+ */
+function checkImageData(promise, { width, height } = { width: 1, height: 1 }) {
+  return promise.then(({ size }) => {
+    is(size.naturalWidth, width, "The width is correct.");
+    is(size.naturalHeight, height, "The height is correct.");
+  });
+}
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1192536">Mozilla Bug 1192536</a>
+<a id="inspectorContent" target="_blank" href="inspector_getImageData.html">Test Document</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>