GaudiConfig2: strict type checking for list properties

Allow only `list` types to be assigned to `list` properties and extend
test coverage. This brings GaudiConfig2 in line with the legacy
configurables. I.e. the following now fails:
```
  MyAlg.MyVecOfStrings = "abc"
```

GaudiConfiguration/python/GaudiConfig2/semantics.py

@@ -148,7 +148,7 @@ class FloatSemantics(PropertySemantics):
 
         if not isinstance(value, Number):
             raise TypeError(
-                "number expected, got {!r} in assignemnt to {}".format(value, self.name)
+                "number expected, got {!r} in assignment to {}".format(value, self.name)
             )
         return float(value)
 
@@ -360,6 +360,10 @@ class SequenceSemantics(PropertySemantics):
         self.value_semantics.name = "{} element".format(self._name)
 
     def store(self, value):
+        if not isinstance(value, (list, _ListHelper)):
+            raise TypeError(
+                "list expected, got {!r} in assignment to {}".format(value, self.name)
+            )
         new_value = _ListHelper(self.value_semantics)
         new_value.extend(value)
         return new_value
@@ -494,6 +498,7 @@ class MappingSemantics(PropertySemantics):
         self.value_semantics.name = "{} value".format(self._name)
 
     def store(self, value):
+        # No explicit type checking as anything else than dict fails in update call
         new_value = _DictHelper(self.key_semantics, self.value_semantics)
         new_value.update(value)
         return new_value

GaudiConfiguration/tests/python/test_mapping_semantics.py

@@ -95,6 +95,12 @@ def test_access():
     assert d.get("q", "Q") == "Q"
 
 
+def test_assignment_bad_type():
+    s = S.getSemanticsFor("std::map<std::string, std::string>")
+    with pytest.raises(AttributeError):
+        s.store([("a", 1), ("b", 2)])
+
+
 def test_assignment_bad_value():
     s = S.getSemanticsFor("std::map<std::string, std::string>")
     with pytest.raises(TypeError):

GaudiConfiguration/tests/python/test_sequence_semantics.py

@@ -89,6 +89,12 @@ def test_assignment_bad():
     with pytest.raises(TypeError):
         s.store(["a", "b", 1])
 
+    with pytest.raises(TypeError):
+        s.store("ab")
+
+    with pytest.raises(TypeError):
+        s.store(set("ab"))
+
 
 def test_in_alg():
     p = AlgWithVectors()

GaudiConfiguration/tests/python/test_serialization.py

 #####################################################################################
-# (c) Copyright 1998-2020 CERN for the benefit of the LHCb and ATLAS collaborations #
+# (c) Copyright 1998-2023 CERN for the benefit of the LHCb and ATLAS collaborations #
 #                                                                                   #
 # This software is distributed under the terms of the Apache version 2 licence,     #
 # copied verbatim in the file "LICENSE".                                            #
@@ -50,7 +50,7 @@ def test_repr(with_global_instances):
     assert t1.name == orig_name
     assert t1.Bool == t.Bool
 
-    p = AlgWithVectors(VS="abc")
+    p = AlgWithVectors(VS=list("abc"))
     q = eval(repr(p))
     assert list(q.VS) == list("abc")
     assert repr(q) == repr(p)
@@ -88,7 +88,7 @@ def test_pickle(with_global_instances):
     assert t1.name == orig_name
     assert t1.Bool == t.Bool
 
-    p = AlgWithVectors(VS="abc")
+    p = AlgWithVectors(VS=list("abc"))
     q = loads(dumps(p))
     assert list(q.VS) == list("abc")
     assert dumps(q) == dumps(p)
@@ -107,7 +107,7 @@ def test_pickle(with_global_instances):
 def test_full_serialization_repr(with_global_instances):
     MyAlg("Alg1", AnIntProp=1)
     SimpleOptsAlgTool("ToolA", parent=MyAlg("Alg2", AnIntProp=2))
-    AlgWithVectors("AV", VS="abc")
+    AlgWithVectors("AV", VS=list("abc"))
     AlgWithMaps("AM", MSS={"a": "B"})
 
     serial = repr(list(Configurable.instances.values()))
@@ -122,7 +122,7 @@ def test_full_serialization_pickle(with_global_instances):
 
     MyAlg("Alg1", AnIntProp=1)
     SimpleOptsAlgTool("ToolA", parent=MyAlg("Alg2", AnIntProp=2))
-    AlgWithVectors("AV", VS="abc")
+    AlgWithVectors("AV", VS=list("abc"))
     AlgWithMaps("AM", MSS={"a": "B"})
 
     serial = dumps(list(Configurable.instances.values()))