finished requirements 1,2,5. Working on 3 and 4'

Author: Tingting-Chang

test/core/contexts.json

@@ -1,8 +1,12 @@
 [pytest]
-# Prevent pytest from trying to collect MetaflowTest subclasses as test cases.
+# Prevent pytest from trying to collect MetaflowTest subclasses as test cases,
+# JSON graph files, or framework utilities — none of those are pytest tests.
 norecursedirs = tests graphs metaflow_extensions metaflow_test __pycache__ .tox
 
+# Default timeout, verbosity and failure formatting for all core test runs.
+# Centralised here so tox commands only carry what differs per env.
 timeout = 1800
+addopts = -v --tb=short
 
 markers =
     local: local datastore/metadata context