Add a test.

Author: ZeroIntensity

Lib/test/test_sys.py

@@ -272,6 +272,25 @@ def check_exit_message(code, expected, **env_vars):
             r'import sys; sys.exit("h\xe9")',
             b"h\xe9", PYTHONIOENCODING='latin-1')
 
+    @support.requires_subprocess()
+    def test_exit_codes_under_repl(self):
+        import tempfile
+
+        cases = [
+            ("exit", 123),
+            ("exit", 0),
+            ("__import__('sys').exit", 123),
+            ("__import__('sys').exit", 0)
+        ]
+
+        for exitfunc, return_code in cases:
+            with self.subTest(exitfunc=exitfunc, return_code=return_code):
+                with tempfile.TemporaryFile("w+") as stdin:
+                    stdin.write(f"{exitfunc}({return_code})\n")
+                    stdin.seek(0)
+                    proc = subprocess.run([sys.executable], stdin=stdin)
+                    self.assertEqual(proc.returncode, return_code)
+
     def test_getdefaultencoding(self):
         self.assertRaises(TypeError, sys.getdefaultencoding, 42)
         # can't check more than the type, as the user might have changed it