Use autouse fixture to set env vars required for EPICS to use lo inte…

…rface (#283)

tests/conftest.py

@@ -33,6 +33,23 @@ def pytest_internalerror(excinfo):
         raise excinfo.value
 
 
+# Autouse fixture that will set all EPICS networking env vars to use lo interface
+# to avoid false failures caused by things like firewalls blocking EPICS traffic.
+@pytest.fixture(scope="session", autouse=True)
+def configure_epics_environment():
+    os.environ["EPICS_CAS_INTF_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_CAS_BEACON_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_CA_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_CAS_AUTO_ADDR_LIST"] = "NO"
+    os.environ["EPICS_CA_AUTO_BEACON_ADDR_LIST"] = "NO"
+
+    os.environ["EPICS_PVAS_INTF_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_PVAS_BEACON_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_PVA_ADDR_LIST"] = "127.0.0.1"
+    os.environ["EPICS_PVAS_AUTO_BEACON_ADDR_LIST"] = "NO"
+    os.environ["EPICS_PVA_AUTO_ADDR_LIST"] = "NO"
+
+
 @pytest.fixture(scope="function")
 def RE(request):
     loop = asyncio.new_event_loop()