1 files changed, 21 insertions, 0 deletions
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 2ec4e2e..67a4053 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -3289,6 +3289,27 @@ class PdbTestReadline(unittest.TestCase):
         self.assertIn(b'continue', output)
         self.assertIn(b'hello!', output)
 
+    def test_expression_completion(self):
+        script = textwrap.dedent("""
+            value = "speci"
+            import pdb; pdb.Pdb().set_trace()
+        """)
+
+        # Complete: value + 'al'
+        input = b"val\t + 'al'\n"
+        # Complete: p value + 'es'
+        input += b"p val\t + 'es'\n"
+        # Complete: $_frame
+        input += b"$_fra\t\n"
+        # Continue
+        input += b"c\n"
+
+        output = run_pty(script, input)
+
+        self.assertIn(b'special', output)
+        self.assertIn(b'species', output)
+        self.assertIn(b'$_frame', output)
+
 
 def load_tests(loader, tests, pattern):
     from test import test_pdb