diff --git a/aircox/admin/filters.py b/aircox/admin/filters.py
index aab8e2f..f14f8e3 100644
--- a/aircox/admin/filters.py
+++ b/aircox/admin/filters.py
@@ -13,7 +13,7 @@ class DateFieldFilter(filters.FieldListFilter):
     input_type = "date"
 
     def __init__(self, field, request, params, model, model_admin, field_path):
-        self.field_generic = "%s__" % field_path
+        self.field_generic = f"{field_path}__"
         self.date_params = {
             k: v for k, v in params.items() if k.startswith(self.field_generic)
         }
diff --git a/aircox/admin/mixins.py b/aircox/admin/mixins.py
deleted file mode 100644
index f3a9cc2..0000000
--- a/aircox/admin/mixins.py
+++ /dev/null
@@ -1,41 +0,0 @@
-class UnrelatedInlineMixin:
-    """Inline class that can be included in an admin change view whose model is
-    not directly related to inline's model."""
-
-    view_model = None
-    parent_model = None
-    parent_fk = ""
-
-    def __init__(self, parent_model, admin_site):
-        self.view_model = parent_model
-        super().__init__(self.parent_model, admin_site)
-
-    def get_parent(self, view_obj):
-        """Get formset's instance from `obj` of AdminSite's change form."""
-        field = self.parent_model._meta.get_field(self.parent_fk).remote_field
-        return getattr(view_obj, field.name, None)
-
-    def save_parent(self, parent, view_obj):
-        """Save formset's instance."""
-        setattr(parent, self.parent_fk, view_obj)
-        parent.save()
-        return parent
-
-    def get_formset(self, request, obj):
-        ParentFormSet = super().get_formset(request, obj)
-        inline = self
-
-        class FormSet(ParentFormSet):
-            view_obj = None
-
-            def __init__(self, *args, instance=None, **kwargs):
-                self.view_obj = instance
-                instance = inline.get_parent(instance)
-                self.instance = instance
-                super().__init__(*args, instance=instance, **kwargs)
-
-            def save(self):
-                inline.save_parent(self.instance, self.view_obj)
-                return super().save()
-
-        return FormSet
diff --git a/aircox/test.py b/aircox/test.py
index 58635d9..36c6778 100644
--- a/aircox/test.py
+++ b/aircox/test.py
@@ -121,7 +121,7 @@ class SpoofMixin:
         if funcs is not None:
             self.funcs = funcs
 
-    def get_trace(self, name, args=False, kw=False):
+    def get_trace(self, name="__call__", args=False, kw=False):
         """Get a function call parameters.
 
         :param str name: function name
@@ -137,7 +137,7 @@ class SpoofMixin:
             raise ValueError(f"{name} called multiple times.")
         return self._get_trace(trace, args=args, kw=kw)
 
-    def get_traces(self, name, args=False, kw=False):
+    def get_traces(self, name="__call__", args=False, kw=False):
         """Get a tuple of all call parameters.
 
         Parameters are the same as `get()`.
diff --git a/aircox/tests/conftest.py b/aircox/tests/conftest.py
index c99d469..173949a 100644
--- a/aircox/tests/conftest.py
+++ b/aircox/tests/conftest.py
@@ -3,6 +3,7 @@ import itertools
 import logging
 
 from django.contrib.auth.models import User
+from django.test import RequestFactory
 
 import pytest
 from model_bakery import baker
@@ -11,6 +12,10 @@ from aircox import models
 from aircox.test import Interface
 
 
+req_factory = RequestFactory()
+"""Request Factory used among different tests."""
+
+
 @pytest.fixture
 def staff_user():
     return baker.make(User, is_active=True, is_staff=True)
@@ -25,8 +30,13 @@ def logger():
 
 
 @pytest.fixture
-def stations():
-    return baker.make(models.Station, _quantity=2)
+def station():
+    return baker.make(models.Station, audio_streams="stream 1\nstream 2")
+
+
+@pytest.fixture
+def stations(station):
+    return [station, baker.make(models.Station)]
 
 
 @pytest.fixture
@@ -35,7 +45,11 @@ def programs(stations):
         itertools.chain(
             *(
                 baker.make(
-                    models.Program, station=station, cover=None, _quantity=2
+                    models.Program,
+                    station=station,
+                    cover=None,
+                    status=models.Program.STATUS_PUBLISHED,
+                    _quantity=2,
                 )
                 for station in stations
             )
diff --git a/aircox/tests/test_admin_site.py b/aircox/tests/test_admin_site.py
index 7af82a0..62234c9 100644
--- a/aircox/tests/test_admin_site.py
+++ b/aircox/tests/test_admin_site.py
@@ -1,13 +1,14 @@
 from django.urls import path, reverse
-from django.test import RequestFactory
 from django.utils.translation import gettext_lazy as _
 
 import pytest
 
 from aircox import admin_site, urls as _urls
+from .conftest import req_factory
 
 
-reqs = RequestFactory()
+# Just for code quality: urls module is required because we need some
+# url resolvers to be registered in order to run tests.
 _urls
 
 
@@ -19,7 +20,7 @@ def site():
 class TestAdminSite:
     @pytest.mark.django_db
     def test_each_context(self, site, staff_user):
-        req = reqs.get("admin/test")
+        req = req_factory.get("admin/test")
         req.user = staff_user
         context = site.each_context(req)
         assert "programs" in context
diff --git a/aircox/views/base.py b/aircox/views/base.py
index a41ccc1..a52afda 100644
--- a/aircox/views/base.py
+++ b/aircox/views/base.py
@@ -48,9 +48,7 @@ class BaseView(TemplateResponseMixin, ContextMixin):
                 kwargs["sidebar_list_url"] = self.get_sidebar_url()
 
         if "audio_streams" not in kwargs:
-            streams = self.station.audio_streams
-            streams = streams and streams.split("\n")
-            kwargs["audio_streams"] = streams
+            kwargs["audio_streams"] = self.station.streams
 
         if "model" not in kwargs:
             model = (
@@ -63,7 +61,7 @@ class BaseView(TemplateResponseMixin, ContextMixin):
         return super().get_context_data(**kwargs)
 
 
-# FIXME: rename to sth like [Base]?StationAPIView
+# FIXME: rename to sth like [Base]?StationAPIView/Mixin
 class BaseAPIView:
     @property
     def station(self):
diff --git a/aircox/views/mixins.py b/aircox/views/mixins.py
index 3edf1bd..a4e98d1 100644
--- a/aircox/views/mixins.py
+++ b/aircox/views/mixins.py
@@ -91,6 +91,8 @@ class AttachedToMixin:
         return super().get_page()
 
 
+# FIXME: django-filter provides filter mixin, but I don't remember why this is
+# used.
 class FiltersMixin:
     """Mixin integrating Django filters' filter set."""
 
diff --git a/notes.md b/notes.md
index a021f21..d9dcba9 100755
--- a/notes.md
+++ b/notes.md
@@ -76,6 +76,6 @@ cms:
 
 # For the next version:
 ## Refactorisation
-Move:
-- into `aircox_streamer`: `Log`, `Port`
-- into `aircox_cms`: `Page`, `NavItem`, `Category`, `StaticPage`, etc.
+- move into `aircox_streamer`: `Log`, `Port`
+- move into `aircox_cms`: `Page`, `NavItem`, `Category`, `StaticPage`, etc.
+- use TextChoice and IntegerChoices in models fields enums