test_h5types: use in-memory files

.gitignore

@@ -17,7 +17,6 @@ __pycache__/
 /misoc_*/
 
 /artiq/test/results
-/artiq/test/h5types.h5
 /artiq/examples/master/results
 /artiq/examples/master/last_rid.pyon
 /artiq/examples/master/dataset_db.pyon
@@ -31,5 +30,4 @@ __pycache__/
 /last_rid.pyon
 /dataset_db.pyon
 /device_db.pyon
-/h5types.h5
 /test*.py

artiq/test/test_h5types.py

@@ -21,5 +21,5 @@ class TypesCase(unittest.TestCase):
         for size in 16, 32, 64:
             d["f"+str(size)] = getattr(np, "float" + str(size))(42)
 
-        with h5py.File("h5types.h5", "w") as f:
+        with h5py.File("h5types.h5", "w", "core", backing_store=False) as f:
             result_dict_to_hdf5(f, d)