added placeholder for arch decision record

Author: yuanchi2807

codeflare/tests/README.md

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+# Architecture decision record 
+
+Test framework for ray-pipeline
+
+Contents:
+
+* [Use pytest as test framework] #use-pytest-as-test-framework
+* [Unit test coverage] #unit-test-coverage
+
+## Use pytest as test framework
+
+## Unit test coverage
+
+

codeflare/tests/test_and.py

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+import pytest
+import ray
+from hercules.Datamodel import Xy
+from hercules.Datamodel import XYRef
+import hercules.Datamodel as dm
+