Add size method to file operations.

Author: joshuamcginnis

lib/net/sftp/operations/file.rb

@@ -131,6 +131,11 @@ def print(*items)
       nil
     end
 
+    # Returns the size of the file from stats
+    def size
+      stat.size
+    end
+
     # Writes each argument to the stream, appending a newline to any item
     # that does not already end in a newline. Array arguments are flattened.
     def puts(*items)

test/test_file.rb

@@ -156,4 +156,10 @@ def test_stat_should_return_attributes_object_for_handle
     @sftp.expects(:fstat!).with("handle").returns(stat)
     assert_equal stat, @file.stat
   end
-end
+
+  def test_size_should_return_size_from_stat
+    stat = stub(size: 1024)
+    @sftp.expects(:fstat!).with("handle").returns(stat)
+    assert_equal 1024, @file.size
+  end
+end