Propagating Long Name through components, test for name propagation a…

…dded to test_device

ophyd/device.py

@@ -258,6 +258,10 @@ def create_component(self, instance):
             attr_name=self.attr,
         )
 
+        _long_name = kwargs.get("long_name", self.attr)
+        _parent_long_name = getattr(instance, "long_name", instance.name)
+        kwargs["long_name"] = f"{_parent_long_name} {_long_name}"
+
         for kw, val in list(kwargs.items()):
             kwargs[kw] = self.maybe_add_prefix(instance, kw, val)
 
@@ -1785,7 +1789,6 @@ def wrapped(self, *args, **kwargs):
 def _wait_for_connection_context(value, doc):
     @contextlib.contextmanager
     def wrapped(dev):
-
         orig = dev.lazy_wait_for_connection
         dev.lazy_wait_for_connection = value
         try:

ophyd/tests/test_device.py

@@ -768,14 +768,14 @@ def test_dotted_name():
     from ophyd.sim import SynSignal
 
     class Inner(Device):
-        x = Cpt(SynSignal)
+        x = Cpt(SynSignal, long_name="Inner X")
         y = Cpt(SynSignal)
 
     class Outer(Device):
-        a = Cpt(Inner)
+        a = Cpt(Inner, long_name="Outer A")
         b = Cpt(Inner)
 
-    o = Outer(name="test")
+    o = Outer(name="test", long_name="Test")
 
     assert o.dotted_name == ""
     assert o.a.dotted_name == "a"
@@ -797,6 +797,14 @@ class Outer(Device):
     assert o.a.y.attr_name == "y"
     assert o.b.y.attr_name == "y"
 
+    assert o.long_name == "Test"
+    assert o.a.long_name == "Test Outer A"
+    assert o.b.long_name == "Test b"
+    assert o.a.x.long_name == "Test Outer A Inner X"
+    assert o.a.y.long_name == "Test Outer A y"
+    assert o.b.x.long_name == "Test b Inner X"
+    assert o.b.y.long_name == "Test b y"
+
 
 def test_create_device():
     components = dict(