diff --git a/Dockerfile b/Dockerfile
index 7e8e0d14..33a6acff 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -44,7 +44,7 @@ RUN apt-get clean && apt-get -y update && apt-get -y install --no-install-recomm
 RUN if [ "$INSTALL_DEBUG" ] ; then \
         apt-get -y update && apt-get -y install --no-install-recommends \
         vim htop bmon net-tools iputils-ping procps \
-        && pip install --user ipython \
+        && pip install --user ipython pytest pytest-django \
     ; fi
 
 # make folders
diff --git a/tubearchivist/config/settings.py b/tubearchivist/config/settings.py
index ac41eaa0..b81e3b49 100644
--- a/tubearchivist/config/settings.py
+++ b/tubearchivist/config/settings.py
@@ -33,7 +33,9 @@ SECRET_KEY = PW_HASH.hexdigest()
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = bool(environ.get("DJANGO_DEBUG"))
 
-ALLOWED_HOSTS, CSRF_TRUSTED_ORIGINS = ta_host_parser(environ["TA_HOST"])
+ALLOWED_HOSTS, CSRF_TRUSTED_ORIGINS = ta_host_parser(
+    environ.get("TA_HOST", "localhost")
+)
 
 # Application definition
 
diff --git a/tubearchivist/requirements-dev.txt b/tubearchivist/requirements-dev.txt
index 33c81ec8..02778fba 100644
--- a/tubearchivist/requirements-dev.txt
+++ b/tubearchivist/requirements-dev.txt
@@ -5,4 +5,6 @@ flake8
 isort
 pylint
 pylint-django
+pytest
+pytest-django
 types-requests