ensure that movedir(src,dst) raises ResourceNotFoundError is src doesn't exist

fs/base.py

@@ -783,7 +783,9 @@ class FS(object):
             is required
         """
         if not self.isdir(src):
+            if self.isfile(src):
                 raise ResourceInvalidError(src, msg="Source is not a directory: %(path)s")
+            raise ResourceNotFoundError(src)
         if not overwrite and self.exists(dst):
             raise DestinationExistsError(dst)
 

fs/tests/__init__.py

@@ -406,6 +406,7 @@ class FSTestCases(object):
         def makefile(path):
             self.fs.createfile(path, contents)
 
+        self.assertRaises(ResourceNotFoundError,self.fs.movedir,"a","b")
         self.fs.makedir("a")
         self.fs.makedir("b")
         makefile("a/1.txt")