CI: add simple simulated IOC for testing

Author: dmgav

.github/workflows/testing.yml

@@ -33,7 +33,7 @@ jobs:
 
         export EPICS_CA_AUTO_ADDR_LIST=NO
         export EPICS_CA_ADDR_LIST=127.0.0.1
-        python -m caproto.ioc_examples.simple &
+        python ioc/sim_ioc.py &
 
     - name: Test with pytest
       run: |

ioc/sim_ioc.py

@@ -0,0 +1,31 @@
+from textwrap import dedent
+
+from caproto.server import PVGroup, ioc_arg_parser, pvproperty, run
+
+
+class SimpleIOC(PVGroup):
+    """
+    An IOC with three uncoupled read/writable PVs.
+
+    Scalar PVs
+    ----------
+    A (int)
+    B (float)
+
+    Array PVs
+    ---------
+    C (array of int)
+    """
+
+    A = pvproperty(
+        value=1,
+        doc="An integer",
+    )
+    B = pvproperty(value=2.0, doc="A float")
+    C = pvproperty(value=[1, 2, 3], doc="An array of integers (max length 3)")
+
+
+if __name__ == "__main__":
+    ioc_options, run_options = ioc_arg_parser(default_prefix="simple:", desc=dedent(SimpleIOC.__doc__))
+    ioc = SimpleIOC(**ioc_options)
+    run(ioc.pvdb, **run_options)