Use wonderwords for shell names

tests/test_app.py

@@ -1,15 +1,35 @@
 import contextlib
+import importlib
 import io
 import json
+import re
 import subprocess
 import sys
 import unittest
+from unittest.mock import Mock, patch
 
 from ipython_demo.app import App
 from ipython_demo.models import CallResponse
 
 
 class AppTests(unittest.TestCase):
+    def test_generate_good_names_uses_readable_random_words(self):
+        app_module = importlib.import_module("ipython_demo.app")
+        generator = Mock()
+        generator.word.side_effect = ["luminous", "otter"]
+
+        with patch.object(
+            app_module,
+            "_WORD_GENERATOR",
+            generator,
+            create=True,
+        ):
+            name = app_module.generate_good_names()
+
+        self.assertRegex(name, re.compile(r"^[a-z]+-[a-z]+-[0-9a-f]{4}$"))
+        generator.word.assert_any_call(include_parts_of_speech=["adjectives"])
+        generator.word.assert_any_call(include_parts_of_speech=["nouns"])
+
     def test_main_emits_one_json_payload(self):
         completed = subprocess.run(
             [sys.executable, "-c", "from ipython_demo.app import main; main()"],