Switch to __array_ufunc__ in tests as a way to avoid numpy broadcasting

Author: inducer

Diff for: test/test_arraycontext.py

@@ -136,7 +136,8 @@ def __init__(self, actx, data):
         self.array_context = actx
         self.data = data
 
-    __array_priority__ = 10
+    # prevent numpy broadcasting
+    __array_ufunc__ = None
 
     def __bool__(self):
         if len(self) == 1 and self.data[0].size == 1:
@@ -222,6 +223,8 @@ class MyContainer:
     momentum: np.ndarray
     enthalpy: Union[DOFArray, np.ndarray]
 
+    __array_ufunc__ = None
+
     @property
     def array_context(self):
         if isinstance(self.mass, np.ndarray):
@@ -1367,7 +1370,8 @@ def test_container_equality(actx_factory):
 class Foo:
     u: DOFArray
 
-    __array_priority__ = 1  # disallow numpy arithmetic to take precedence
+    # prevent numpy arithmetic from taking precedence
+    __array_ufunc__ = None
 
     @property
     def array_context(self):