use pytest cmd line

Author: jreback

appveyor.yml

@@ -86,8 +86,8 @@ install:
 test_script:
   # tests
   - cmd: activate pandas-msgpack
-  - cmd: cd c:\\
-  - cmd: python -c "import pandas_msgpack; pandas_msgpack.test('-v')"
+  - cmd: cd c:\\temp
+  - cmd: pytest --pyargs pandas_msgpack -v
 
 artifacts:
   - path: dist\*

pandas_msgpack/__init__.py

@@ -12,9 +12,6 @@
 
 from .packers import to_msgpack, read_msgpack
 
-# testing
-from ._tester import test
-
 # versioning
 from ._version import get_versions