Update tests a bit

Author: msullivan

mypyc/test-data/run-classes.test

@@ -1163,10 +1163,12 @@ class Bar(Foo):
 z: Foo = Bar()
 z.f(1, z=2)
 z.f(1, 2, 3)
+# z.f(x=5)  # Not tested because we (knowingly) do the wrong thing and pass it as positional
 
 [out]
 Bar (1,) {'z': 2}
 Bar (1, 2, 3) {}
+--Bar () {'x': 5}
 
 [case testMethodOverrideDefault8]
 from typing import TypeVar, Any
@@ -1214,6 +1216,10 @@ z: Foo = Baz()
 z.f()
 z.f(y=1)
 z.f(1, 2)
+# Not tested because we don't (and probably won't) match cpython here
+# from testutil import assertRaises
+# with assertRaises(TypeError):
+#     z.f(x=7)
 
 [out]
 Baz 30 50

mypyc/test-data/run-python38.test

@@ -78,7 +78,11 @@ class Bar(Foo):
 z: Foo = Bar()
 z.f(1, z=50)
 z.f()
+z.f(1)
+z.f(z=50)
 
 [out]
 stuff (1,) {'z': 50}
 stuff () {}
+stuff (1,) {}
+stuff () {'z': 50}