[madmom] Revert changes to run test-units (not working)

conda/madmom/meta.yaml

@@ -35,9 +35,6 @@ requirements:
 
 test:
 
-  requires:
-    - pytest
-
   imports:
     - madmom
     - madmom.audio
@@ -48,12 +45,6 @@ test:
     - madmom.models
     - madmom.utils
 
-  source_files:
-    - tests/*
-
-  commands:
-    - pytest tests
-
 about:
   home: https://github.com/CPJKU/madmom
   license: BSD License