Fix Dispatcher tests

tests/test_dispatcher.py

@@ -16,9 +16,10 @@ def g(x: float):
         pass
 
     assert set(dispatch.functions.keys()) == {"f", "g"}
-    assert dispatch.functions["f"].methods[0] == Signature(int)
-    assert dispatch.functions["g"].methods[0] == Signature(float)
-    assert dispatch.functions["g"].methods[0].precedence == 1
+    assert dispatch.functions["f"].methods[0].signature == Signature(int)
+    assert dispatch.functions["g"].methods[0].signature == Signature(
+        float, precedence=1
+    )
 
 
 def test_dispatch_class():
@@ -37,9 +38,10 @@ def g(x: float):
     a = "tests.test_dispatcher.test_dispatch_class.<locals>.A"
     b = "tests.test_dispatcher.test_dispatch_class.<locals>.B"
     assert set(dispatch.classes.keys()) == {a, b}
-    assert dispatch.classes[a]["f"].methods[0] == Signature(int)
-    assert dispatch.classes[b]["g"].methods[0] == Signature(float)
-    assert dispatch.classes[b]["g"].methods[0].precedence == 1
+    assert dispatch.classes[a]["f"].methods[0].signature == Signature(int)
+    assert dispatch.classes[b]["g"].methods[0].signature == Signature(
+        float, precedence=1
+    )
 
 
 def test_dispatch_multi():
@@ -56,7 +58,7 @@ def f(x):
     assert f(1) == "int"
     assert f(1.0) == "float or str"
     assert f("1") == "float or str"
-    assert dispatch.functions["f"].methods[2].precedence == 1
+    assert dispatch.functions["f"].methods[2].signature.precedence == 1
 
     # Check that arguments to `dispatch.multi` must be tuples or signatures.
     with pytest.raises(ValueError):