[mypyc] Make exception type check in assertRaises test helper precise (#18241)

Author: JukkaL

mypyc/test-data/fixtures/testutil.py

@@ -45,7 +45,7 @@ def assertRaises(typ: type, msg: str = '') -> Iterator[None]:
     try:
         yield
     except Exception as e:
-        assert isinstance(e, typ), f"{e!r} is not a {typ.__name__}"
+        assert type(e) is typ, f"{e!r} is not a {typ.__name__}"
         assert msg in str(e), f'Message "{e}" does not match "{msg}"'
     else:
         assert False, f"Expected {typ.__name__} but got no exception"

mypyc/test-data/run-i64.test

@@ -1307,28 +1307,28 @@ def test_many_locals() -> None:
         a31: i64 = 31
         a32: i64 = 32
         a33: i64 = 33
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a0)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a31)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a32)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a33)
     a0 = 5
     assert a0 == 5
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a31)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a32)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a33)
     a32 = 55
     assert a0 == 5
     assert a32 == 55
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a31)
-    with assertRaises(NameError):
+    with assertRaises(UnboundLocalError):
         print(a33)
     a31 = 10
     a33 = 20

mypyc/test-data/run-misc.test

@@ -37,9 +37,9 @@ from testutil import assertRaises
 
 f(True, True)
 f(False, False)
-with assertRaises(NameError):
+with assertRaises(UnboundLocalError):
     f(False, True)
-with assertRaises(NameError):
+with assertRaises(UnboundLocalError):
     g()
 [out]
 lol

mypyc/test-data/run-primitives.test

@@ -345,10 +345,10 @@ delAttribute()
 delAttributeMultiple()
 with assertRaises(AttributeError):
     native.global_var
-with assertRaises(NameError, 'local variable "dummy" referenced before assignment'):
+with assertRaises(UnboundLocalError, 'local variable "dummy" referenced before assignment'):
     delLocal(True)
 assert delLocal(False) == 10
-with assertRaises(NameError, 'local variable "dummy" referenced before assignment'):
+with assertRaises(UnboundLocalError, 'local variable "dummy" referenced before assignment'):
     delLocalLoop()
 [out]
 (1, 2, 3)