bots: Move contrib_bots to api/bots*.

This will make it convenient to include these bots in Zulip API
releases on pypi.

Fix #5009.

api/bots/encrypt/test_encrypt.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+from __future__ import absolute_import
+from __future__ import print_function
+
+import os
+import sys
+
+our_dir = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.normpath(os.path.join(our_dir)))
+# For dev setups, we can find the API in the repo itself.
+if os.path.exists(os.path.join(our_dir, '..')):
+    sys.path.insert(0, '..')
+from bots_test_lib import BotTestCase
+
+class TestEncryptBot(BotTestCase):
+    bot_name = "encrypt"
+
+    def test_bot(self):
+        expected = {
+            "": "Encrypted/Decrypted text: ",
+            "Let\'s Do It": "Encrypted/Decrypted text: Yrg\'f Qb Vg",
+            "me&mom together..!!": "Encrypted/Decrypted text: zr&zbz gbtrgure..!!",
+            "foo bar": "Encrypted/Decrypted text: sbb one",
+            "Please encrypt this": "Encrypted/Decrypted text: Cyrnfr rapelcg guvf",
+        }
+        self.check_expected_responses(expected)