diff --git a/aider/repo.py b/aider/repo.py
index 4538c16a3..7869091ea 100644
--- a/aider/repo.py
+++ b/aider/repo.py
@@ -5,6 +5,7 @@ import git
 import pathspec
 
 from aider import prompts, utils
+from aider.models import Model
 from aider.sendchat import simple_send_with_retries
 
 from .dump import dump  # noqa: F401
@@ -18,7 +19,10 @@ class GitRepo:
 
     def __init__(self, io, fnames, git_dname, aider_ignore_file=None, models=None):
         self.io = io
-        self.models = models
+        if models:
+            self.models = models
+        else:
+            self.models = [Model("gpt-3.5-turbo")]
 
         if git_dname:
             check_fnames = [git_dname]
diff --git a/pytest.ini b/pytest.ini
index 5ea365392..8fa4e613f 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,3 +1,4 @@
 [pytest]
 norecursedirs = tmp.* build benchmark
+addopts = -p no:warnings