1 files changed, 202 insertions, 0 deletions
diff --git a/devtools/shared/resources/tests/browser_resources_css_messages.js b/devtools/shared/resources/tests/browser_resources_css_messages.js
new file mode 100644
index 0000000000..0e82bacd57
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+++ b/devtools/shared/resources/tests/browser_resources_css_messages.js
@@ -0,0 +1,202 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test the ResourceWatcher API around CSS_MESSAGE
+// Reproduces the CSS message assertions from devtools/shared/webconsole/test/chrome/test_page_errors.html
+
+const {
+  ResourceWatcher,
+} = require("devtools/shared/resources/resource-watcher");
+const { MESSAGE_CATEGORY } = require("devtools/shared/constants");
+
+// Create a simple server so we have a nice sourceName in the resources packets.
+const httpServer = createTestHTTPServer();
+httpServer.registerPathHandler(`/test_css_messages.html`, (req, res) => {
+  res.setStatusLine(req.httpVersion, 200, "OK");
+  res.write(`<meta charset=utf8>
+    <style>
+      html {
+        color: bloup;
+      }
+    </style>Test CSS Messages`);
+});
+
+const TEST_URI = `http://localhost:${httpServer.identity.primaryPort}/test_css_messages.html`;
+
+add_task(async function() {
+  await testWatchingCssMessages();
+  await testWatchingCachedCssMessages();
+});
+
+async function testWatchingCssMessages() {
+  // Disable the preloaded process as it creates processes intermittently
+  // which forces the emission of RDP requests we aren't correctly waiting for.
+  await pushPref("dom.ipc.processPrelaunch.enabled", false);
+
+  // Open a test tab
+  const tab = await addTab(TEST_URI);
+
+  const { client, resourceWatcher, targetList } = await initResourceWatcher(
+    tab
+  );
+
+  const receivedMessages = [];
+  const { onAvailable, onAllMessagesReceived } = setupOnAvailableFunction(
+    targetList,
+    receivedMessages
+  );
+  await resourceWatcher.watchResources([ResourceWatcher.TYPES.CSS_MESSAGE], {
+    onAvailable,
+  });
+
+  info(
+    "Now log CSS warning *after* the call to ResourceWatcher.watchResources and after " +
+      "having received the existing message"
+  );
+  // We need to wait for the first CSS Warning as it is not a cached message; when we
+  // start watching, the `cssErrorReportingEnabled` is checked on the target docShell, and
+  // if it is false, we re-parse the stylesheets to get the messages.
+  await BrowserTestUtils.waitForCondition(() => receivedMessages.length === 1);
+
+  info("Trigger a CSS Warning");
+  triggerCSSWarning(tab);
+
+  info("Waiting for all expected CSS messages to be received");
+  await onAllMessagesReceived;
+  ok(true, "All the expected CSS messages were received");
+
+  Services.console.reset();
+  targetList.destroy();
+  await client.close();
+}
+
+async function testWatchingCachedCssMessages() {
+  // Disable the preloaded process as it creates processes intermittently
+  // which forces the emission of RDP requests we aren't correctly waiting for.
+  await pushPref("dom.ipc.processPrelaunch.enabled", false);
+
+  // Open a test tab
+  const tab = await addTab(TEST_URI);
+
+  // By default, the CSS Parser does not emit warnings at all, for performance matter.
+  // Since we actually want the Parser to emit those messages _before_ we start listening
+  // for CSS messages, we need to set the cssErrorReportingEnabled flag on the docShell.
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function() {
+    content.docShell.cssErrorReportingEnabled = true;
+  });
+
+  // Setting the docShell flag only indicates to the Parser that from now on, it should
+  // emit warnings. But it does not automatically emit warnings for the existing CSS
+  // errors in the stylesheets. So here we reload the tab, which will make the Parser
+  // parse the stylesheets again, this time emitting warnings.
+  const loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+  tab.linkedBrowser.reload();
+  // wait for the tab to be fully loaded
+  await loaded;
+  // and trigger more CSS warnings
+  await triggerCSSWarning(tab);
+
+  // At this point, all messages should be in the ConsoleService cache, and we can begin
+  // to watch and check that we do retrieve those messages.
+  const { client, resourceWatcher, targetList } = await initResourceWatcher(
+    tab
+  );
+
+  const receivedMessages = [];
+  const { onAvailable } = setupOnAvailableFunction(
+    targetList,
+    receivedMessages
+  );
+  await resourceWatcher.watchResources([ResourceWatcher.TYPES.CSS_MESSAGE], {
+    onAvailable,
+  });
+  is(receivedMessages.length, 3, "Cached messages were retrieved as expected");
+
+  Services.console.reset();
+  targetList.destroy();
+  await client.close();
+}
+
+function setupOnAvailableFunction(targetList, receivedMessages) {
+  // The expected messages are the CSS warnings:
+  // - one for the rule in the style element
+  // - two for the JS modified style we're doing in the test.
+  const expectedMessages = [
+    {
+      pageError: {
+        errorMessage: /Expected color but found ‘bloup’/,
+        sourceName: /test_css_messages/,
+        category: MESSAGE_CATEGORY.CSS_PARSER,
+        timeStamp: /^\d+$/,
+        error: false,
+        warning: true,
+      },
+      cssSelectors: "html",
+    },
+    {
+      pageError: {
+        errorMessage: /Error in parsing value for ‘width’/,
+        sourceName: /test_css_messages/,
+        category: MESSAGE_CATEGORY.CSS_PARSER,
+        timeStamp: /^\d+$/,
+        error: false,
+        warning: true,
+      },
+    },
+    {
+      pageError: {
+        errorMessage: /Error in parsing value for ‘height’/,
+        sourceName: /test_css_messages/,
+        category: MESSAGE_CATEGORY.CSS_PARSER,
+        timeStamp: /^\d+$/,
+        error: false,
+        warning: true,
+      },
+    },
+  ];
+
+  let done;
+  const onAllMessagesReceived = new Promise(resolve => (done = resolve));
+  const onAvailable = resources => {
+    for (const resource of resources) {
+      const { pageError } = resource;
+
+      is(
+        resource.targetFront,
+        targetList.targetFront,
+        "The targetFront property is the expected one"
+      );
+
+      if (!pageError.sourceName.includes("test_css_messages")) {
+        info(`Ignore error from unknown source: "${pageError.sourceName}"`);
+        continue;
+      }
+
+      const index = receivedMessages.length;
+      receivedMessages.push(pageError);
+
+      info(
+        `checking received css message #${index}: ${pageError.errorMessage}`
+      );
+      ok(pageError, "The resource has a pageError attribute");
+      checkObject(resource, expectedMessages[index]);
+
+      if (receivedMessages.length == expectedMessages.length) {
+        done();
+      }
+    }
+  };
+  return { onAvailable, onAllMessagesReceived };
+}
+
+/**
+ * Sets invalid values for width and height on the document's body style attribute.
+ */
+function triggerCSSWarning(tab) {
+  return ContentTask.spawn(tab.linkedBrowser, null, function frameScript() {
+    content.document.body.style.width = "red";
+    content.document.body.style.height = "blue";
+  });
+}