Reading list downloader retries on recoverable error

ios/chrome/browser/reading_list/reading_list_entry_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ios/chrome/browser/reading_list/reading_list_entry.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 112 matching lines @@
   ASSERT_EQ(2, e.TimeUntilNextTry().InSeconds());
 
   // Action.
   e.SetDistilledURL(GURL("http://example.com"));
 
   // Test.
   EXPECT_EQ(0, e.TimeUntilNextTry().InSeconds());
   e.SetDistilledState(ReadingListEntry::ERROR);
   EXPECT_EQ(1, e.TimeUntilNextTry().InSeconds());
 }
+
+// Tests that the failed download counter is incremented when the state change
+// from non-error to error.
+TEST(ReadingListEntry, FailedDownloadCounter) {
+  ReadingListEntry e(GURL("http://example.com"), "bar");
+
+  ASSERT_EQ(0, e.FailedDownloadCounter());
+
+  e.SetDistilledState(ReadingListEntry::ERROR);
+  EXPECT_EQ(1, e.FailedDownloadCounter());
+  e.SetDistilledState(ReadingListEntry::WILL_RETRY);
+  EXPECT_EQ(1, e.FailedDownloadCounter());
+
+  e.SetDistilledState(ReadingListEntry::PROCESSING);
+  EXPECT_EQ(1, e.FailedDownloadCounter());
+
+  e.SetDistilledState(ReadingListEntry::WILL_RETRY);
+  EXPECT_EQ(2, e.FailedDownloadCounter());
+  e.SetDistilledState(ReadingListEntry::ERROR);
+  EXPECT_EQ(2, e.FailedDownloadCounter());
+}