Issue 5146 - Implement DownloadableSubscription parsing in C++

test/synchronizer.js

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+let {
+  createSandbox, setupTimerAndXMLHttp, setupRandomResult, unexpectedError, Cr,
+  MILLIS_IN_SECOND, MILLIS_IN_HOUR
+} = require("./_common");
+
+let Filter = null;
+let FilterStorage = null;
+let Prefs = null;
+let Subscription = null;
+
+exports.setUp = function(callback)
+{
+  let globals = Object.assign({}, setupTimerAndXMLHttp.call(this),
+    setupRandomResult.call(this));
+
+  let sandboxedRequire = createSandbox({globals});
+  (
+    {Filter} = sandboxedRequire("../lib/filterClasses"),
+    {FilterStorage} = sandboxedRequire("../lib/filterStorage"),
+    {Prefs} = sandboxedRequire("./stub-modules/prefs"),
+    {Subscription} = sandboxedRequire("../lib/subscriptionClasses"),
+    sandboxedRequire("../lib/synchronizer")
+  );
+
+  callback();
+};
+
+function resetSubscription(subscription)
+{
+  FilterStorage.clearSubscriptionFilters(subscription);
+  subscription.lastCheck = subscription.lastDownload =
+    subscription.version = subscription.lastSuccess =
+    subscription.expires = subscription.softExpiration = 0;
+  subscription.title = "";
+  subscription.homepage = null;
+  subscription.errors = 0;
+  subscription.downloadStatus = null;
+  subscription.requiredVersion = null;
+}
+
+function testFiltersEqual(test, subscription, expected, message)
+{
+  test.deepEqual(
+    Array.from(subscription.filters, filter => filter.text),
+    expected.map(filter => filter.text));
+}
+
+function testSubscriptionEqual(test, sub1, sub2, message)
+{
+  test.equal(sub1.fixedTitle, sub2.fixedTitle, message);
+  test.equal(sub1.homepage, sub2.homepage, message);
+}
+
+let initialDelay = 1 / 60;
+
+exports.testOneSubscriptionDownloads = function(test)
+{
+  let subscription = Subscription.fromURL("http://example.com/subscription");
+  FilterStorage.addSubscription(subscription);
+
+  let requests = [];
+  this.registerHandler("/subscription", metadata =>
+  {
+    requests.push([this.getTimeOffset(), metadata.method, metadata.path]);
+    return [Cr.NS_OK, 200, "[Adblock]\n! ExPiREs: 1day\nfoo\nbar"];
+  });
+
+  this.runScheduledTasks(50).then(() =>
+  {
+    test.deepEqual(requests, [
+      [0 + initialDelay, "GET", "/subscription"],
+      [24 + initialDelay, "GET", "/subscription"],
+      [48 + initialDelay, "GET", "/subscription"]
+    ], "Requests after 50 hours");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};
+
+exports.testTwoSubscriptionsDownloads = function(test)
+{
+  let subscription1 = Subscription.fromURL("http://example.com/subscription1");
+  FilterStorage.addSubscription(subscription1);
+
+  let subscription2 = Subscription.fromURL("http://example.com/subscription2");
+  subscription2.expires =
+    subscription2.softExpiration =
+    (this.currentTime + 2 * MILLIS_IN_HOUR) / MILLIS_IN_SECOND;
+  FilterStorage.addSubscription(subscription2);
+
+  let requests = [];
+  let handler = metadata =>
+  {
+    requests.push([this.getTimeOffset(), metadata.method, metadata.path]);
+    return [Cr.NS_OK, 200, "[Adblock]\n! ExPiREs: 1day\nfoo\nbar"];
+  };
+
+  this.registerHandler("/subscription1", handler);
+  this.registerHandler("/subscription2", handler);
+
+  this.runScheduledTasks(55).then(() =>
+  {
+    test.deepEqual(requests, [
+      [0 + initialDelay, "GET", "/subscription1"],
+      [2 + initialDelay, "GET", "/subscription2"],
+      [24 + initialDelay, "GET", "/subscription1"],
+      [26 + initialDelay, "GET", "/subscription2"],
+      [48 + initialDelay, "GET", "/subscription1"],
+      [50 + initialDelay, "GET", "/subscription2"]
+    ], "Requests after 55 hours");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};
+
+exports.testSubscriptionHeaders = {};
+
+for (let currentTest of [
+  {header: "[Adblock]", downloadStatus: "synchronize_ok", requiredVersion: ""},
+  {header: "[Adblock Plus]", downloadStatus: "synchronize_ok", requiredVersion: ""},
+  {header: "(something)[Adblock]", downloadStatus: "synchronize_ok", requiredVersion: ""},
+  {header: "[Adblock Plus 0.0.1]", downloadStatus: "synchronize_ok", requiredVersion: "0.0.1"},
+  {header: "[Adblock Plus 99.9]", downloadStatus: "synchronize_ok", requiredVersion: "99.9"},
+  {header: "[Foo]", downloadStatus: "synchronize_invalid_data", requiredVersion: ""}
+])
+{
+  exports.testSubscriptionHeaders[currentTest.header] = function(test)
+  {
+    let subscription = Subscription.fromURL("http://example.com/subscription");
+    FilterStorage.addSubscription(subscription);
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 200, currentTest.header + "\n!Expires: 8 hours\nfoo\n!bar\n\n@@bas\n#bam"];
+    });
+
+    this.runScheduledTasks(2).then(() =>
+    {
+      test.equal(subscription.downloadStatus, currentTest.downloadStatus, "Download status");
+      test.equal(subscription.requiredVersion, currentTest.requiredVersion, "Required version");
+
+      if (currentTest.downloadStatus == "synchronize_ok")
+      {
+        testFiltersEqual(test, subscription, [
+          Filter.fromText("foo"),
+          Filter.fromText("!bar"),
+          Filter.fromText("@@bas"),
+          Filter.fromText("#bam")
+        ], "Resulting subscription filters");
+      }
+      else
+      {
+        testFiltersEqual(test, subscription, [],
+                         "Resulting subscription filters");
+      }
+    }).catch(unexpectedError.bind(test)).then(() => test.done());
+  };
+}
+
+exports.testsDisabledUpdates = function(test)
+{
+  Prefs.subscriptions_autoupdate = false;
+
+  let subscription = Subscription.fromURL("http://example.com/subscription");
+  FilterStorage.addSubscription(subscription);
+
+  let requests = 0;
+  this.registerHandler("/subscription", metadata =>
+  {
+    requests++;
+    throw new Error("Unexpected request");
+  });
+
+  this.runScheduledTasks(50).then(() =>
+  {
+    test.equal(requests, 0, "Request count");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};
+
+exports.testExpirationTime = {};
+
+for (let currentTest of [
+  {
+    expiration: "default",
+    randomResult: 0.5,
+    requests: [0 + initialDelay, 5 * 24 + initialDelay]
+  },
+  {
+    expiration: "1 hours",  // Minimal expiration interval
+    randomResult: 0.5,
+    requests: [0 + initialDelay, 1 + initialDelay, 2 + initialDelay, 3 + initialDelay]
+  },
+  {
+    expiration: "26 hours",
+    randomResult: 0.5,
+    requests: [0 + initialDelay, 26 + initialDelay]
+  },
+  {
+    expiration: "2 days",
+    randomResult: 0.5,
+    requests: [0 + initialDelay, 48 + initialDelay]
+  },
+  {
+    expiration: "20 days",  // Too large, will be corrected
+    randomResult: 0.5,
+    requests: [0 + initialDelay, 14 * 24 + initialDelay]
+  },
+  {
+    expiration: "35 hours",
+    randomResult: 0,        // Changes interval by factor 0.8
+    requests: [0 + initialDelay, 28 + initialDelay]
+  },
+  {
+    expiration: "35 hours",
+    randomResult: 1,        // Changes interval by factor 1.2
+    requests: [0 + initialDelay, 42 + initialDelay]
+  },
+  {
+    expiration: "35 hours",
+    randomResult: 0.25,     // Changes interval by factor 0.9
+    requests: [0 + initialDelay, 32 + initialDelay]
+  },
+  {
+    expiration: "40 hours",
+    randomResult: 0.5,
+    skipAfter: 5 + initialDelay,
+    skip: 10,               // Short break should not increase soft expiration
+    requests: [0 + initialDelay, 40 + initialDelay]
+  },
+  {
+    expiration: "40 hours",
+    randomResult: 0.5,
+    skipAfter: 5 + initialDelay,
+    skip: 30,               // Long break should increase soft expiration
+    requests: [0 + initialDelay, 70 + initialDelay]
+  },
+  {
+    expiration: "40 hours",
+    randomResult: 0.5,
+    skipAfter: 5 + initialDelay,
+    skip: 80,               // Hitting hard expiration, immediate download
+    requests: [0 + initialDelay, 85 + initialDelay]
+  }
+])
+{
+  let testId = `"${currentTest.expiration}"`;
+  if (currentTest.randomResult != 0.5)
+    testId += " with Math.random() returning " + currentTest.randomResult;
+  if (currentTest.skip)
+    testId += " skipping " + currentTest.skip + " hours after " + currentTest.skipAfter + " hours";
+  exports.testExpirationTime[testId] = function(test)
+  {
+    let subscription = Subscription.fromURL("http://example.com/subscription");
+    FilterStorage.addSubscription(subscription);
+
+    let requests = [];
+    this.registerHandler("/subscription", metadata =>
+    {
+      requests.push(this.getTimeOffset());
+      return [Cr.NS_OK, 200, "[Adblock]\nfoo\n!Expires: " + currentTest.expiration + "\nbar"];
+    });
+
+    this.randomResult = currentTest.randomResult;
+
+    let maxHours = Math.round(Math.max.apply(null, currentTest.requests)) + 1;
+    this.runScheduledTasks(maxHours, currentTest.skipAfter, currentTest.skip).then(() =>
+    {
+      test.deepEqual(requests, currentTest.requests, "Requests");
+    }).catch(unexpectedError.bind(test)).then(() => test.done());
+  };
+}
+
+exports.testChecksumVerification = {};
+
+for (let [testName, subscriptionBody, expectedResult] of [
+  ["Correct checksum", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoo\nbar\n", true],
+  ["Wrong checksum", "[Adblock]\n! Checksum: wrongggny6Fn24b7JHsq/A\nfoo\nbar\n", false],
+  ["Empty lines ignored", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\n\nfoo\n\nbar\n\n", true],
+  ["CR LF line breaks treated like LR", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoo\r\nbar\r\n", true],
+  ["CR line breaks treated like LR", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoo\rbar\r", true],
+  ["Trailing line break not ignored", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoo\nbar", false],
+  ["Line breaks between lines not ignored", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoobar", false],
+  ["Lines with spaces not ignored", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\n \nfoo\n\nbar\n", false],
+  ["Extra content in checksum line is part of the checksum", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A foobar\nfoo\nbar\n", false],
+  ["= symbols after checksum are ignored", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A==\nfoo\nbar\n", true],
+  ["Header line is part of the checksum", "[Adblock Plus]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\nfoo\nbar\n", false],
+  ["Special comments are part of the checksum", "[Adblock]\n! Checksum: e/JCmqXny6Fn24b7JHsq/A\n! Expires: 1\nfoo\nbar\n", false]
+])
+{
+  exports.testChecksumVerification[testName] = function(test)
+  {
+    let subscription = Subscription.fromURL("http://example.com/subscription");
+    FilterStorage.addSubscription(subscription);
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 200, subscriptionBody];
+    });
+
+    this.runScheduledTasks(2).then(() =>
+    {
+      test.equal(subscription.downloadStatus, expectedResult ? "synchronize_ok" : "synchronize_checksum_mismatch");
+    }).catch(unexpectedError.bind(test)).then(() => test.done());
+  };
+}
+
+exports.testSpecialComments = {};
+
+for (let [comment, check] of [
+  ["! Homepage: http://example.com/", (test, subscription) =>
+  {
+    test.equal(subscription.homepage, "http://example.com/", "Valid homepage comment");
+  }],
+  ["! Homepage: ssh://example.com/", (test, subscription) =>
+  {
+    test.equal(subscription.homepage, "", "Invalid homepage comment");
+  }],
+  ["! Title: foo", (test, subscription) =>
+  {
+    test.equal(subscription.title, "foo", "Title comment");
+    test.equal(subscription.fixedTitle, true, "Fixed title");
+  }],
+  ["! Version: 1234", (test, subscription) =>
+  {
+    test.equal(subscription.version, 1234, "Version comment");
+  }]
+])
+{
+  exports.testSpecialComments[comment] = function(test)
+  {
+    let subscription = Subscription.fromURL("http://example.com/subscription");
+    FilterStorage.addSubscription(subscription);
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 200, "[Adblock]\n" + comment + "\nfoo\nbar"];
+    });
+
+    this.runScheduledTasks(2).then(() =>
+    {
+      check(test, subscription);
+      testFiltersEqual(test, subscription, [Filter.fromText("foo"), Filter.fromText("bar")], "Special comment not added to filters");
+    }).catch(unexpectedError.bind(test)).then(() => test.done());
+  };
+}
+
+exports.testRedirects = function(test)
+{
+  let subscription = Subscription.fromURL("http://example.com/subscription");
+  FilterStorage.addSubscription(subscription);
+
+  this.registerHandler("/subscription", metadata =>
+  {
+    return [Cr.NS_OK, 200, "[Adblock]\nfoo\n!Redirect: http://example.com/redirected\nbar"];
+  });
+
+  let requests;
+
+  this.runScheduledTasks(30).then(() =>
+  {
+    testSubscriptionEqual(test, FilterStorage.subscriptionAt(0), subscription, "Invalid redirect ignored");
+    test.equal(subscription.downloadStatus, "synchronize_connection_error", "Connection error recorded");
+    test.equal(subscription.errors, 2, "Number of download errors");
+
+    requests = [];
+
+    this.registerHandler("/redirected", metadata =>
+    {
+      requests.push(this.getTimeOffset());
+      return [Cr.NS_OK, 200, "[Adblock]\nfoo\n! Expires: 8 hours\nbar"];
+    });
+
+    resetSubscription(subscription);
+    return this.runScheduledTasks(15);
+  }).then(() =>
+  {
+    test.equal(FilterStorage.subscriptionAt(0).url, "http://example.com/redirected", "Redirect followed");
+    test.deepEqual(requests, [0 + initialDelay, 8 + initialDelay], "Resulting requests");
+
+    this.registerHandler("/redirected", metadata =>
+    {
+      return [Cr.NS_OK, 200, "[Adblock]\nfoo\n!Redirect: http://example.com/subscription\nbar"];
+    });
+
+    subscription = Subscription.fromURL("http://example.com/subscription");
+    resetSubscription(subscription);
+    FilterStorage.removeSubscription(FilterStorage.subscriptionAt(0));
+    FilterStorage.addSubscription(subscription);
+
+    return this.runScheduledTasks(2);
+  }).then(() =>
+  {
+    testSubscriptionEqual(test, FilterStorage.subscriptionAt(0), subscription, "Redirect not followed on redirect loop");
+    test.equal(subscription.downloadStatus, "synchronize_connection_error", "Download status after redirect loop");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};
+
+exports.testFallback = function(test)
+{
+  Prefs.subscriptions_fallbackerrors = 3;
+  Prefs.subscriptions_fallbackurl = "http://example.com/fallback?%SUBSCRIPTION%&%CHANNELSTATUS%&%RESPONSESTATUS%";
+
+  let subscription = Subscription.fromURL("http://example.com/subscription");
+  FilterStorage.addSubscription(subscription);
+
+  // No valid response from fallback
+
+  let requests = [];
+  let fallbackParams;
+  let redirectedRequests;
+  this.registerHandler("/subscription", metadata =>
+  {
+    requests.push(this.getTimeOffset());
+    return [Cr.NS_OK, 404, ""];
+  });
+
+  this.runScheduledTasks(100).then(() =>
+  {
+    test.deepEqual(requests, [0 + initialDelay, 24 + initialDelay, 48 + initialDelay, 72 + initialDelay, 96 + initialDelay], "Continue trying if the fallback doesn't respond");
+
+    // Fallback giving "Gone" response
+
+    resetSubscription(subscription);
+    requests = [];
+    fallbackParams = null;
+    this.registerHandler("/fallback", metadata =>
+    {
+      fallbackParams = decodeURIComponent(metadata.queryString);
+      return [Cr.NS_OK, 200, "410 Gone"];
+    });
+
+    return this.runScheduledTasks(100);
+  }).then(() =>
+  {
+    test.deepEqual(requests, [0 + initialDelay, 24 + initialDelay, 48 + initialDelay], "Stop trying if the fallback responds with Gone");
+    test.equal(fallbackParams, "http://example.com/subscription&0&404", "Fallback arguments");
+
+    // Fallback redirecting to a missing file
+
+    subscription = Subscription.fromURL("http://example.com/subscription");
+    resetSubscription(subscription);
+    FilterStorage.removeSubscription(FilterStorage.subscriptionAt(0));
+    FilterStorage.addSubscription(subscription);
+    requests = [];
+
+    this.registerHandler("/fallback", metadata =>
+    {
+      return [Cr.NS_OK, 200, "301 http://example.com/redirected"];
+    });
+    return this.runScheduledTasks(100);
+  }).then(() =>
+  {
+    test.equal(FilterStorage.subscriptionAt(0).url, "http://example.com/subscription", "Ignore invalid redirect from fallback");
+    test.deepEqual(requests, [0 + initialDelay, 24 + initialDelay, 48 + initialDelay, 72 + initialDelay, 96 + initialDelay], "Requests not affected by invalid redirect");
+
+    // Fallback redirecting to an existing file
+
+    resetSubscription(subscription);
+    requests = [];
+    redirectedRequests = [];
+    this.registerHandler("/redirected", metadata =>
+    {
+      redirectedRequests.push(this.getTimeOffset());
+      return [Cr.NS_OK, 200, "[Adblock]\n!Expires: 1day\nfoo\nbar"];
+    });
+
+    return this.runScheduledTasks(100);
+  }).then(() =>
+  {
+    test.equal(FilterStorage.subscriptionAt(0).url, "http://example.com/redirected", "Valid redirect from fallback is followed");
+    test.deepEqual(requests, [0 + initialDelay, 24 + initialDelay, 48 + initialDelay], "Stop polling original URL after a valid redirect from fallback");
+    test.deepEqual(redirectedRequests, [48 + initialDelay, 72 + initialDelay, 96 + initialDelay], "Request new URL after a valid redirect from fallback");
+
+    // Checksum mismatch
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 200, "[Adblock]\n! Checksum: wrong\nfoo\nbar"];
+    });
+
+    subscription = Subscription.fromURL("http://example.com/subscription");
+    resetSubscription(subscription);
+    FilterStorage.removeSubscription(FilterStorage.subscriptionAt(0));
+    FilterStorage.addSubscription(subscription);
+
+    return this.runScheduledTasks(100);
+  }).then(() =>
+  {
+    test.equal(FilterStorage.subscriptionAt(0).url, "http://example.com/redirected", "Wrong checksum produces fallback request");
+
+    // Redirect loop
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 200, "[Adblock]\n! Redirect: http://example.com/subscription2"];
+    });
+    this.registerHandler("/subscription2", metadata =>
+    {
+      return [Cr.NS_OK, 200, "[Adblock]\n! Redirect: http://example.com/subscription"];
+    });
+
+    subscription = Subscription.fromURL("http://example.com/subscription");
+    resetSubscription(subscription);
+    FilterStorage.removeSubscription(FilterStorage.subscriptionAt(0));
+    FilterStorage.addSubscription(subscription);
+
+    return this.runScheduledTasks(100);
+  }).then(() =>
+  {
+    test.equal(FilterStorage.subscriptionAt(0).url, "http://example.com/redirected", "Fallback can still redirect even after a redirect loop");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};
+
+exports.testStateFields = function(test)
+{
+  let subscription = Subscription.fromURL("http://example.com/subscription");
+  FilterStorage.addSubscription(subscription);
+
+  this.registerHandler("/subscription", metadata =>
+  {
+    return [Cr.NS_OK, 200, "[Adblock]\n! Expires: 2 hours\nfoo\nbar"];
+  });
+
+  let startTime = this.currentTime;
+  this.runScheduledTasks(2).then(() =>
+  {
+    test.equal(subscription.downloadStatus, "synchronize_ok", "downloadStatus after successful download");
+    test.equal(subscription.lastDownload * MILLIS_IN_SECOND, startTime + initialDelay * MILLIS_IN_HOUR, "lastDownload after successful download");
+    test.equal(subscription.lastSuccess * MILLIS_IN_SECOND, startTime + initialDelay * MILLIS_IN_HOUR, "lastSuccess after successful download");
+    test.equal(subscription.lastCheck * MILLIS_IN_SECOND, startTime + (1 + initialDelay) * MILLIS_IN_HOUR, "lastCheck after successful download");
+    test.equal(subscription.errors, 0, "errors after successful download");
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_ERROR_FAILURE, 0, ""];
+    });
+
+    return this.runScheduledTasks(2);
+  }).then(() =>
+  {
+    test.equal(subscription.downloadStatus, "synchronize_connection_error", "downloadStatus after connection error");
+    test.equal(subscription.lastDownload * MILLIS_IN_SECOND, startTime + (2 + initialDelay) * MILLIS_IN_HOUR, "lastDownload after connection error");
+    test.equal(subscription.lastSuccess * MILLIS_IN_SECOND, startTime + initialDelay * MILLIS_IN_HOUR, "lastSuccess after connection error");
+    test.equal(subscription.lastCheck * MILLIS_IN_SECOND, startTime + (3 + initialDelay) * MILLIS_IN_HOUR, "lastCheck after connection error");
+    test.equal(subscription.errors, 1, "errors after connection error");
+
+    this.registerHandler("/subscription", metadata =>
+    {
+      return [Cr.NS_OK, 404, ""];
+    });
+
+    return this.runScheduledTasks(24);
+  }).then(() =>
+  {
+    test.equal(subscription.downloadStatus, "synchronize_connection_error", "downloadStatus after download error");
+    test.equal(subscription.lastDownload * MILLIS_IN_SECOND, startTime + (26 + initialDelay) * MILLIS_IN_HOUR, "lastDownload after download error");
+    test.equal(subscription.lastSuccess * MILLIS_IN_SECOND, startTime + initialDelay * MILLIS_IN_HOUR, "lastSuccess after download error");
+    test.equal(subscription.lastCheck * MILLIS_IN_SECOND, startTime + (27 + initialDelay) * MILLIS_IN_HOUR, "lastCheck after download error");
+    test.equal(subscription.errors, 2, "errors after download error");
+  }).catch(unexpectedError.bind(test)).then(() => test.done());
+};