Enhance tests for pdal.Reader and pdal.Writer types

Added assertions to validate reader and writer types for filespec format.

Author: mrtgenet

test/test_pipeline.py

@@ -3,7 +3,6 @@
 import os
 import sys
 
-from typing import List
 from itertools import product
 import numpy as np
 import pytest
@@ -284,6 +283,12 @@ def test_infer_stage_type(self):
         assert pdal.Writer("foo.xxx").type == ""
         assert pdal.Reader().type == ""
         assert pdal.Writer().type == ""
+        assert pdal.Reader({"path": "foo.las"}).type == "readers.las"
+        assert pdal.Writer({"path": "foo.las"}).type == "writers.las"
+        assert pdal.Reader({"path": "foo.xxx"}).type == ""
+        assert pdal.Writer({"path": "foo.xxx"}).type == ""
+        assert pdal.Reader({}).type == ""
+        assert pdal.Writer({}).type == ""
 
     def test_streamable(self):
         """Can we distinguish streamable from non-streamable stages and pipeline"""