GH-103804: Add test for dis.disco (#103901)

Author: jkchandalia

Lib/test/test_dis.py

@@ -881,6 +881,13 @@ def do_disassembly_test(self, func, expected, with_offsets=False):
         self.maxDiff = None
         got = self.get_disassembly(func, depth=0)
         self.do_disassembly_compare(got, expected, with_offsets)
+        # Add checks for dis.disco
+        if hasattr(func, '__code__'):
+            got_disco = io.StringIO()
+            with contextlib.redirect_stdout(got_disco):
+                dis.disco(func.__code__)
+            self.do_disassembly_compare(got_disco.getvalue(), expected,
+                                        with_offsets)
 
     def test_opmap(self):
         self.assertEqual(dis.opmap["NOP"], 9)