Split ExtensionWebRequestApiTest.WebRequestEvents into multiple tests to

chrome/test/data/extensions/api_test/webrequest/framework.js

+var getURL = chrome.extension.getURL;
+var deepEq = chrome.test.checkDeepEq;
+var expectedEventData;
+var capturedEventData;
+var expectedEventOrder;
+var tabId;
+var testServerPort;
+var eventsCaptured;
+
+function runTests(tests) {
+  chrome.tabs.create({url: "about:blank"}, function(tab) {
+    tabId = tab.id;
+    chrome.test.getConfig(function(config) {
+      testServerPort = config.testServer.port;
+      chrome.test.runTests(tests);
+    });
+  });
+}
+
+// Returns an URL from the test server, fixing up the port. Must be called
+// from within a test case passed to runTests.
+function getServerURL(path) {
+  if (!testServerPort)
+    throw new Error("Called getServerURL outside of runTests.");
+  return "http://www.a.com:" + testServerPort + "/" + path;
+}
+
+// Helper to advance to the next test only when the tab has finished loading.
+// This is because tabs.update can sometimes fail if the tab is in the middle
+// of a navigation (from the previous test), resulting in flakiness.
+function navigateAndWait(url, callback) {
+  var done = chrome.test.listenForever(chrome.tabs.onUpdated,
+      function (_, info, tab) {
+    if (tab.id == tabId && info.status == "complete") {
+      if (callback) callback();
+      done();
+    }
+  });
+  chrome.tabs.update(tabId, {url: url});
+}
+
+// data: array of extected events, each one is a dictionary:
+//     { label: "<unique identifier>",
+//       event: "<webrequest event type>",
+//       details: { <expected details of the webrequest event> },
+//       retval: { <dictionary that the event handler shall return> } (optional)
+//     }
+// order: an array of sequences, e.g. [ ["a", "b", "c"], ["d", "e"] ] means that
+//     event with label "a" needs to occur before event with label "b". The
+//     relative order of "a" and "d" does not matter.
+// filter: filter dictionary passed on to the event subscription of the
+//     webRequest API.
+// extraInfoSpec: the union of all desired extraInfoSpecs for the events.
+function expect(data, order, filter, extraInfoSpec) {
+  expectedEventData = data;
+  capturedEventData = [];
+  expectedEventOrder = order;
+  eventsCaptured = chrome.test.callbackAdded();
+  tabAndFrameUrls = {};  // Maps "{tabId}-{frameId}" to the URL of the frame.
+  removeListeners();
+  initListeners(filter || {}, extraInfoSpec || []);
+}
+
+function checkExpectations() {
+  if (capturedEventData.length < expectedEventData.length) {
+    return;
+  }
+  if (capturedEventData.length > expectedEventData.length) {
+    chrome.test.fail("Recorded too many events. " +
+        JSON.stringify(capturedEventData));
+    return;
+  }
+  // We have ensured that capturedEventData contains exactly the same elements
+  // as expectedEventData. Now we need to verify the ordering.
+  // Step 1: build positions such that
+  //     positions[<event-label>]=<position of this event in capturedEventData>
+  var curPos = 0;
+  var positions = {}
+  capturedEventData.forEach(function (event) {
+    chrome.test.assertTrue(event.hasOwnProperty("label"));
+    positions[event.label] = curPos;
+    curPos++;
+  });
+  // Step 2: check that elements arrived in correct order
+  expectedEventOrder.forEach(function (order) {
+    var previousLabel = undefined;
+    order.forEach(function(label) {
+      if (previousLabel === undefined) {
+        previousLabel = label;
+        return;
+      }
+      chrome.test.assertTrue(positions[previousLabel] < positions[label],
+          "Event " + previousLabel + " is supposed to arrive before " +
+          label + ".");
+      previousLabel = label;
+    });
+  });
+
+  eventsCaptured();
+}
+
+// Simple check to see that we have a User-Agent header, and that it contains
+// an expected value. This is a basic check that the request headers are valid.
+function checkUserAgent(headers) {
+  for (var i in headers) {
+    if (headers[i].name.toLowerCase() == "user-agent")
+      return headers[i].value.toLowerCase().indexOf("chrome") != -1;
+  }
+  return false;
+}
+
+function captureEvent(name, details) {
+  // Ignore system-level requests like safebrowsing updates and favicon fetches
+  // since they are unpredictable.
+  if (details.tabId == -1 || details.type == "other" ||
+      details.url.match(/\/favicon.ico$/) ||
+      details.url.match(/https:\/\/dl.google.com/))
+    return;
+
+  // Pull the extra per-event options out of the expected data. These let
+  // us specify special return values per event.
+  var currentIndex = capturedEventData.length;
+  var extraOptions;
+  if (expectedEventData.length > currentIndex) {
+    retval = expectedEventData[currentIndex].retval;
+  }
+
+  // Check that the frameId can be used to reliably determine the URL of the
+  // frame that caused requests.
+  if (name == "onBeforeRequest") {
+    chrome.test.assertTrue('frameId' in details &&
+                           typeof details.frameId === 'number');
+    chrome.test.assertTrue('tabId' in details &&
+                            typeof details.tabId === 'number');
+    var key = details.tabId + "-" + details.frameId;
+    if (details.type == "main_frame" || details.type == "sub_frame") {
+      tabAndFrameUrls[key] = details.url;
+    }
+    details.frameUrl = tabAndFrameUrls[key] || "unknown frame URL";
+  }
+  delete details.frameId;
+
+  delete details.requestId;
+  delete details.timeStamp;
+  if (details.requestHeaders) {
+    details.requestHeadersValid = checkUserAgent(details.requestHeaders);
+    delete details.requestHeaders;
+  }
+  if (details.responseHeaders) {
+    details.responseHeadersExist = true;
+    delete details.responseHeaders;
+  }
+
+  // find |details| in expectedEventData
+  var found = false;
+  var label = undefined;
+  expectedEventData.forEach(function (exp) {
+    if (deepEq(exp.event, name) && deepEq(exp.details, details)) {
+      if (found) {
+        chrome.test.fail("Received event twice '" + name + "':" +
+            JSON.stringify(details));
+      } else {
+        found = true;
+        label = exp.label;
+      }
+    }
+  });
+  if (!found) {
+    chrome.test.fail("Received unexpected event '" + name + "':" +
+        JSON.stringify(details));
+  }
+
+  capturedEventData.push({label: label, event: name, details: details});
+  checkExpectations();
+  return retval;
+}
+
+// Simple array intersection. We use this to filter extraInfoSpec so
+// that only the allowed specs are sent to each listener.
+function intersect(array1, array2) {
+  return array1.filter(function(x) { return array2.indexOf(x) != -1; });
+}
+
+function initListeners(filter, extraInfoSpec) {
+  chrome.experimental.webRequest.onBeforeRequest.addListener(
+      function(details) {
+    return captureEvent("onBeforeRequest", details);
+  }, filter, intersect(extraInfoSpec, ["blocking"]));
+  chrome.experimental.webRequest.onBeforeSendHeaders.addListener(
+      function(details) {
+    return captureEvent("onBeforeSendHeaders", details);
+  }, filter, intersect(extraInfoSpec, ["blocking", "requestHeaders"]));
+  chrome.experimental.webRequest.onSendHeaders.addListener(
+      function(details) {
+    return captureEvent("onSendHeaders", details);
+  }, filter, intersect(extraInfoSpec, ["requestHeaders"]));
+  chrome.experimental.webRequest.onAuthRequired.addListener(
+      function(details) {
+    return captureEvent("onAuthRequired", details);
+  }, filter, intersect(extraInfoSpec, ["responseHeaders", "statusLine"]));
+  chrome.experimental.webRequest.onResponseStarted.addListener(
+      function(details) {
+    return captureEvent("onResponseStarted", details);
+  }, filter, intersect(extraInfoSpec, ["responseHeaders", "statusLine"]));
+  chrome.experimental.webRequest.onBeforeRedirect.addListener(
+      function(details) {
+    return captureEvent("onBeforeRedirect", details);
+  }, filter, intersect(extraInfoSpec, ["responseHeaders", "statusLine"]));
+  chrome.experimental.webRequest.onCompleted.addListener(
+      function(details) {
+    return captureEvent("onCompleted", details);
+  }, filter, intersect(extraInfoSpec, ["responseHeaders", "statusLine"]));
+  chrome.experimental.webRequest.onErrorOccurred.addListener(
+      function(details) {
+    return captureEvent("onErrorOccurred", details);
+  }, filter);
+}
+
+function removeListeners() {
+  function helper(event) {
+    // Note: We're poking at the internal event data, but it's easier than
+    // the alternative. If this starts failing, we just need to update this
+    // helper.
+    for (var cb in event.callbackMap_) {
+      event.removeListener(cb);
+    }
+    chrome.test.assertFalse(event.hasListeners());
+  }
+  helper(chrome.experimental.webRequest.onBeforeRequest);
+  helper(chrome.experimental.webRequest.onBeforeSendHeaders);
+  helper(chrome.experimental.webRequest.onAuthRequired);
+  helper(chrome.experimental.webRequest.onSendHeaders);
+  helper(chrome.experimental.webRequest.onResponseStarted);
+  helper(chrome.experimental.webRequest.onBeforeRedirect);
+  helper(chrome.experimental.webRequest.onCompleted);
+  helper(chrome.experimental.webRequest.onErrorOccurred);
+}