python
diff --git a/‎Lib/test/test_pyrepl.py
Lines changed: 98 additions & 0 deletions b/‎Lib/test/test_pyrepl.py
Lines changed: 98 additions & 0 deletions
@@ -23,6 +23,7 @@
 from _pyrepl.readline import ReadlineAlikeReader, ReadlineConfig
 from _pyrepl.simple_interact import _strip_final_indent
 from _pyrepl.unix_eventqueue import EventQueue
+from _pyrepl.input import KeymapTranslator
 
 
 def more_lines(unicodetext, namespace=None):
@@ -931,6 +932,103 @@ def test_setpos_fromxy_in_wrapped_line(self):
         reader.setpos_from_xy(0, 1)
         self.assertEqual(reader.pos, 9)
 
+class KeymapTranslatorTests(unittest.TestCase):
+    def test_push_single_key(self):
+        keymap = [("a", "command_a")]
+        translator = KeymapTranslator(keymap)
+        evt = Event("key", "a")
+        translator.push(evt)
+        result = translator.get()
+        self.assertEqual(result, ("command_a", ["a"]))
+
+    def test_push_multiple_keys(self):
+        keymap = [("ab", "command_ab")]
+        translator = KeymapTranslator(keymap)
+        evt1 = Event("key", "a")
+        evt2 = Event("key", "b")
+        translator.push(evt1)
+        translator.push(evt2)
+        result = translator.get()
+        self.assertEqual(result, ("command_ab", ["a", "b"]))
+
+    def test_push_invalid_key(self):
+        keymap = [("a", "command_a")]
+        translator = KeymapTranslator(keymap)
+        evt = Event("key", "b")
+        translator.push(evt)
+        result = translator.get()
+        self.assertEqual(result, (None, ["b"]))
+
+    def test_push_invalid_key_with_stack(self):
+        keymap = [("ab", "command_ab")]
+        translator = KeymapTranslator(keymap)
+        evt1 = Event("key", "a")
+        evt2 = Event("key", "c")
+        translator.push(evt1)
+        translator.push(evt2)
+        result = translator.get()
+        self.assertEqual(result, (None, ["a", "c"]))
+
+    def test_push_character_key(self):
+        keymap = [("a", "command_a")]
+        translator = KeymapTranslator(keymap)
+        evt = Event("key", "a")
+        translator.push(evt)
+        result = translator.get()
+        self.assertEqual(result, ("command_a", ["a"]))
+
+    def test_push_character_key_with_stack(self):
+        keymap = [("ab", "command_ab")]
+        translator = KeymapTranslator(keymap)
+        evt1 = Event("key", "a")
+        evt2 = Event("key", "b")
+        evt3 = Event("key", "c")
+        translator.push(evt1)
+        translator.push(evt2)
+        translator.push(evt3)
+        result = translator.get()
+        self.assertEqual(result, ("command_ab", ["a", "b"]))
+
+    def test_push_transition_key(self):
+        keymap = [("a", {"b": "command_ab"})]
+        translator = KeymapTranslator(keymap)
+        evt1 = Event("key", "a")
+        evt2 = Event("key", "b")
+        translator.push(evt1)
+        translator.push(evt2)
+        result = translator.get()
+        self.assertEqual(result, ("command_ab", ["a", "b"]))
+
+    def test_push_transition_key_interrupted(self):
+        keymap = [("a", {"b": "command_ab"})]
+        translator = KeymapTranslator(keymap)
+        evt1 = Event("key", "a")
+        evt2 = Event("key", "c")
+        evt3 = Event("key", "b")
+        translator.push(evt1)
+        translator.push(evt2)
+        translator.push(evt3)
+        result = translator.get()
+        self.assertEqual(result, (None, ["a", "c"]))
+
+    def test_push_invalid_key_with_unicode_category(self):
+        keymap = [("a", "command_a")]
+        translator = KeymapTranslator(keymap)
+        evt = Event("key", "\u0003")  # Control character
+        translator.push(evt)
+        result = translator.get()
+        self.assertEqual(result, (None, ["\u0003"]))
+
+    def test_empty(self):
+        keymap = [("a", "command_a")]
+        translator = KeymapTranslator(keymap)
+        self.assertTrue(translator.empty())
+        evt = Event("key", "a")
+        translator.push(evt)
+        self.assertFalse(translator.empty())
+        translator.get()
+        self.assertTrue(translator.empty())
+
 
 if __name__ == "__main__":
     unittest.main()