Add test to assure Select typing

tests/test_type_based_replacement.py

@@ -16,6 +16,7 @@
     remap_by_types,
     remap_from_lambda,
 )
+from func_adl.util_types import is_iterable, unwrap_iterable
 
 
 class Track:
@@ -547,7 +548,20 @@ def test_dictionary_bad_key():
 
 def test_dictionary_through_Select():
     """Make sure the Select statement carries the typing all the way through"""
-    assert False
+
+    s = ast_lambda("e.Jets().Select(lambda j: {'pt': j.pt(), 'eta': j.eta()})")
+    objs = ObjectStream[Event](ast.Name(id="e", ctx=ast.Load()))
+
+    _, _, expr_type = remap_by_types(objs, "e", Event, s)
+
+    assert is_iterable(expr_type)
+    obj_itr = unwrap_iterable(expr_type)
+    assert isclass(obj_itr)
+    sig = inspect.signature(obj_itr.__init__)
+    assert len(sig.parameters) == 3
+    assert "pt" in sig.parameters
+    j_info = sig.parameters["pt"]
+    assert j_info.annotation == float
 
 
 def test_indexed_tuple():