Fixed 3 unit tests.

Fixed:
  - FileCacheTest.CacheSizeTest
  - FileCacheTest.ShrinkCacheTest
  - HashedFileCacheTest.CacheSizeTest

Moved the calculation of the new policy file's size to be outside the
'using' blocks for writing it to disk so that it could read the actual
file size instead of always getting 0.
  - It is moved entirely out of the using blocks to mirror the cache
    item's code.

Removed a duplicated line of code in FileCache.WriteHelper().
  - There was an `if` line that was there twice.
  - This has no effect on anything other than my sanity.

src/FileCache/FileCache.cs

@@ -608,12 +608,14 @@ private long CacheSizeHelper(DirectoryInfo root)
             {
                 size += fi.Length;
             }
+
             // Add subdirectory sizes.
             var dis = root.EnumerateDirectories();
             foreach (DirectoryInfo di in dis)
             {
                 size += CacheSizeHelper(di);
             }
+
             return size;
         }
 
@@ -743,10 +745,9 @@ private void WriteHelper(PayloadMode mode, string key, FileCachePayload data, st
 
             //check to see if limit was reached
             if (CurrentCacheSize > MaxCacheSize)
-                if (CurrentCacheSize > MaxCacheSize)
-                {
-                    MaxCacheSizeReached(this, new FileCacheEventArgs(CurrentCacheSize, MaxCacheSize));
-                }
+            {
+                MaxCacheSizeReached(this, new FileCacheEventArgs(CurrentCacheSize, MaxCacheSize));
+            }
         }
 
         #endregion
@@ -955,7 +956,6 @@ public override object Remove(string key, string regionName = null)
         {
             object valueToDelete = null;
 
-
             if (Contains(key, regionName) == true)
             {
 

src/FileCache/FileCacheManager.cs

@@ -284,12 +284,12 @@ public virtual long WriteFile(FileCache.PayloadMode mode, string key, FileCacheP
                 using (BinaryWriter writer = new BinaryWriter(stream))
                 {
                     data.Policy.Serialize(writer);
-
-                    // adjust cache size
-                    cacheSizeDelta += new FileInfo(cachedPolicy).Length;
                 }
             }
 
+            // Adjust cache size outside of the using blocks to ensure it's after the data is written.
+            cacheSizeDelta += new FileInfo(cachedPolicy).Length;
+
             return cacheSizeDelta;
         }