drive: Add DownloadOperationTest

Move DownloadOperation related tests from FileSystemTest to newly added DownloadedOperationTest.
Add a new method FakeFreeDiskSpaceGetter::Reset().

BUG=244344
TEST=unit_tests

Review URL: https://chromiumcodereview.appspot.com/16189010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203134 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/drive/fake_free_disk_space_getter.cc

@@ -12,6 +12,10 @@ FakeFreeDiskSpaceGetter::FakeFreeDiskSpaceGetter() {
 FakeFreeDiskSpaceGetter::~FakeFreeDiskSpaceGetter() {
 }
 
+void FakeFreeDiskSpaceGetter::Reset() {
+  fake_values_.clear();
+}
+
 int64 FakeFreeDiskSpaceGetter::AmountOfFreeDiskSpace() {
   if (fake_values_.empty())
     return 0;

chrome/browser/chromeos/drive/fake_free_disk_space_getter.h

@@ -19,6 +19,9 @@ class FakeFreeDiskSpaceGetter : public internal::FreeDiskSpaceGetterInterface {
   FakeFreeDiskSpaceGetter();
   virtual ~FakeFreeDiskSpaceGetter();
 
+  // Resets this instance.
+  void Reset();
+
   // If this function is not called, AmountOfFreeDiskSpace() will return 0
   // repeatedly.
   //

chrome/browser/chromeos/drive/file_system/operation_test_base.h

@@ -86,6 +86,9 @@ class OperationTestBase : public testing::Test {
     return blocking_task_runner_;
   }
   internal::ResourceMetadata* metadata() { return metadata_.get(); }
+  FakeFreeDiskSpaceGetter* fake_free_disk_space_getter() {
+    return fake_free_disk_space_getter_.get();
+  }
   internal::FileCache* cache() { return cache_.get(); }
 
  private:

chrome/chrome_tests_unit.gypi

@@ -584,6 +584,7 @@
         'browser/chromeos/drive/file_system_unittest.cc',
         'browser/chromeos/drive/file_system/create_directory_operation_unittest.cc',
         'browser/chromeos/drive/file_system/create_file_operation_unittest.cc',
+        'browser/chromeos/drive/file_system/download_operation_unittest.cc',
         'browser/chromeos/drive/file_system/move_operation_unittest.cc',
         'browser/chromeos/drive/file_system/operation_test_base.cc',
         'browser/chromeos/drive/file_system/operation_test_base.h',