diff --git a/cachalot/tests/models.py b/cachalot/tests/models.py
index 8c48640..817602c 100644
--- a/cachalot/tests/models.py
+++ b/cachalot/tests/models.py
@@ -77,11 +77,6 @@ class PostgresModel(Model):
     date_range = DateRangeField(null=True, blank=True)
     datetime_range = DateTimeRangeField(null=True, blank=True)
 
-    class Meta:
-        # Tests schema name in table name.
-        db_table = '"public"."cachalot_postgresmodel"'
-
-
 class UnmanagedModel(Model):
     name = CharField(max_length=50)
 
diff --git a/settings.py b/settings.py
index 19d7560..7095367 100644
--- a/settings.py
+++ b/settings.py
@@ -8,18 +8,9 @@ DATABASES = {
         'ENGINE': 'django.db.backends.sqlite3',
         'NAME': 'cachalot.sqlite3',
     },
-    'postgresql': {
-        'ENGINE': 'django.db.backends.postgresql',
-        'NAME': 'cachalot',
-        'USER': 'cachalot',
-        'PASSWORD': 'password',
-        'HOST': '127.0.0.1',
-    },
-    'mysql': {
-        'ENGINE': 'django.db.backends.mysql',
-        'NAME': 'cachalot',
-        'USER': 'root',
-        'HOST': '127.0.0.1',
+    'test': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': ':memory:',
     },
 }
 if 'MYSQL_PASSWORD' in os.environ:
@@ -36,22 +27,6 @@ DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 DATABASE_ROUTERS = ['cachalot.tests.db_router.PostgresRouter']
 
 CACHES = {
-    'redis': {
-        'BACKEND': 'django_redis.cache.RedisCache',
-        'LOCATION': 'redis://127.0.0.1:6379/0',
-        'OPTIONS': {
-            # Since we are using both Python 2 & 3 in tests, we need to use
-            # a compatible pickle version to avoid unpickling errors when
-            # running a Python 2 test after a Python 3 test.
-            'PICKLE_VERSION': 2,
-        },
-    },
-    'memcached': {
-        'BACKEND': 'django.core.cache.backends.memcached.'
-                   + ('PyMemcacheCache' if __DJ_V[0] > 2
-                      and (__DJ_V[1] > 1 or __DJ_V[0] > 3) else 'MemcachedCache'),
-        'LOCATION': '127.0.0.1:11211',
-    },
     'locmem': {
         'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
         'OPTIONS': {