rework exception tests to be BasicMemoizer tests

because different memoizers (and different BasicMemoizer configs) won't necessarily have the identity semantics tested here

Author: benclifford

parsl/tests/test_python_apps/test_memoize_exception.py

@@ -1,5 +1,17 @@
+import pytest
+
 import parsl
 from parsl.app.app import python_app
+from parsl.config import Config
+from parsl.dataflow.memoization import BasicMemoizer
+from parsl.executors.threads import ThreadPoolExecutor
+
+
+def local_config():
+    return Config(
+        executors=[ThreadPoolExecutor()],
+        memoizer=BasicMemoizer()
+    )
 
 
 @python_app(cache=True)
@@ -12,8 +24,9 @@ def raise_exception_nocache(x, cache=True):
     raise RuntimeError("exception from raise_exception_nocache")
 
 
+@pytest.mark.local
 def test_python_memoization(n=2):
-    """Test Python memoization of exceptions, with cache=True"""
+    """Test BasicMemoizer memoization of exceptions, with cache=True"""
     x = raise_exception_cache(0)
 
     # wait for x to be done
@@ -27,8 +40,9 @@ def test_python_memoization(n=2):
         assert fut.exception() is x.exception(), "Memoized exception should have been memoized"
 
 
+@pytest.mark.local
 def test_python_no_memoization(n=2):
-    """Test Python non-memoization of exceptions, with cache=False"""
+    """Test BasicMemoizer non-memoization of exceptions, with cache=False"""
     x = raise_exception_nocache(0)
 
     # wait for x to be done