diff --git a/app/api/api_v1/routers/config.py b/app/api/api_v1/routers/config.py
index b7719c65..da588354 100644
--- a/app/api/api_v1/routers/config.py
+++ b/app/api/api_v1/routers/config.py
@@ -1,6 +1,7 @@
 import logging
 
 from fastapi import APIRouter, HTTPException, Request, status
+from app.model.config import ConfigReadDTO
 import app.service.config as config_service
 from app.errors import RepositoryError
 
@@ -9,8 +10,8 @@
 _LOGGER = logging.getLogger(__file__)
 
 
-@r.get("/config")
-async def get_config(request: Request):
+@r.get("/config", response_model=ConfigReadDTO)
+async def get_config(request: Request) -> ConfigReadDTO:
     user = request.state.user
     _LOGGER.info(f"User {user.email} is getting config")
     try:
@@ -19,10 +20,4 @@ async def get_config(request: Request):
         raise HTTPException(
             status_code=status.HTTP_503_SERVICE_UNAVAILABLE, detail=e.message
         )
-
-    if config is None:
-        raise HTTPException(
-            status_code=status.HTTP_404_NOT_FOUND, detail="Config not found"
-        )
-
     return config
diff --git a/app/repository/__init__.py b/app/repository/__init__.py
index d2ac929f..4959c14b 100644
--- a/app/repository/__init__.py
+++ b/app/repository/__init__.py
@@ -5,3 +5,4 @@
 import app.repository.collection as collection_repo
 import app.repository.app_user as app_user_repo
 import app.clients.aws.s3bucket as s3bucket_repo
+import app.repository.config as config_repo
diff --git a/app/service/config.py b/app/service/config.py
index 2ce596dc..9f84216a 100644
--- a/app/service/config.py
+++ b/app/service/config.py
@@ -1,5 +1,6 @@
 import logging
 from app.errors import RepositoryError
+from app.model.config import ConfigReadDTO
 import app.repository.config as config_repo
 
 from sqlalchemy import exc
@@ -9,7 +10,13 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def get():
+def get() -> ConfigReadDTO:
+    """
+    Gets the config
+
+    :raises RepositoryError: If there is an issue getting the config
+    :return ConfigReadDTO: The config for the application
+    """
     try:
         with db_session.get_db() as db:
             return config_repo.get(db)
diff --git a/unit_tests/conftest.py b/unit_tests/conftest.py
index ff8ce3aa..15c42288 100644
--- a/unit_tests/conftest.py
+++ b/unit_tests/conftest.py
@@ -13,6 +13,7 @@
 
 import app.service.family as family_service
 import app.service.collection as collection_service
+import app.service.config as config_service
 import app.service.token as token_service
 from app.repository import (
     family_repo,
@@ -21,6 +22,7 @@
     organisation_repo,
     collection_repo,
     app_user_repo,
+    config_repo,
 )
 
 from unit_tests.mocks.repos.app_user_repo import mock_app_user_repo
@@ -29,9 +31,11 @@
 from unit_tests.mocks.repos.geography_repo import mock_geography_repo
 from unit_tests.mocks.repos.metadata_repo import mock_metadata_repo
 from unit_tests.mocks.repos.organisation_repo import mock_organisation_repo
+from unit_tests.mocks.repos.config_repo import mock_config_repo
 
 from unit_tests.mocks.services.family_service import mock_family_service
 from unit_tests.mocks.services.collection_service import mock_collection_service
+from unit_tests.mocks.services.config_service import mock_config_service
 
 
 @pytest.fixture
@@ -86,6 +90,13 @@ def collection_repo_mock(monkeypatch, mocker):
     yield collection_repo
 
 
+@pytest.fixture
+def config_repo_mock(monkeypatch, mocker):
+    """Mocks the repository for a single test."""
+    mock_config_repo(config_repo, monkeypatch, mocker)
+    yield config_repo
+
+
 # ----- Mock services
 
 
@@ -103,6 +114,13 @@ def collection_service_mock(monkeypatch, mocker):
     yield collection_service
 
 
+@pytest.fixture
+def config_service_mock(monkeypatch, mocker):
+    """Mocks the service for a single test."""
+    mock_config_service(config_service, monkeypatch, mocker)
+    yield config_service
+
+
 # ----- User tokens
 
 
diff --git a/unit_tests/mocks/repos/config_repo.py b/unit_tests/mocks/repos/config_repo.py
new file mode 100644
index 00000000..d7226764
--- /dev/null
+++ b/unit_tests/mocks/repos/config_repo.py
@@ -0,0 +1,22 @@
+from typing import Optional
+from pytest import MonkeyPatch
+
+from sqlalchemy import exc
+
+from app.model.config import ConfigReadDTO
+
+
+def mock_config_repo(config_repo, monkeypatch: MonkeyPatch, mocker):
+    config_repo.return_empty = False
+    config_repo.throw_repository_error = False
+
+    def maybe_throw():
+        if config_repo.throw_repository_error:
+            raise exc.SQLAlchemyError("")
+
+    def mock_get(_) -> Optional[ConfigReadDTO]:
+        maybe_throw()
+        return ConfigReadDTO(geographies=[], taxonomies={}, languages={})
+
+    monkeypatch.setattr(config_repo, "get", mock_get)
+    mocker.spy(config_repo, "get")
diff --git a/unit_tests/mocks/services/config_service.py b/unit_tests/mocks/services/config_service.py
new file mode 100644
index 00000000..bba2dcf2
--- /dev/null
+++ b/unit_tests/mocks/services/config_service.py
@@ -0,0 +1,19 @@
+from pytest import MonkeyPatch
+from app.errors import RepositoryError
+
+from app.model.config import ConfigReadDTO
+
+
+def mock_config_service(config_service, monkeypatch: MonkeyPatch, mocker):
+    config_service.throw_repository_error = False
+
+    def maybe_throw():
+        if config_service.throw_repository_error:
+            raise RepositoryError("bad repo")
+
+    def mock_get_config() -> ConfigReadDTO:
+        maybe_throw()
+        return ConfigReadDTO(geographies=[], taxonomies={}, languages={})
+
+    monkeypatch.setattr(config_service, "get", mock_get_config)
+    mocker.spy(config_service, "get")
diff --git a/unit_tests/routers/README.md b/unit_tests/routers/README.md
new file mode 100644
index 00000000..0fb52d4f
--- /dev/null
+++ b/unit_tests/routers/README.md
@@ -0,0 +1,7 @@
+# Test Approach
+
+In the routers we mock the service to generate the different behaviours.
+
+We then test that these behaviours (such as a db error) result in the correct HTTP response (in the case of a db error it should be a 503).
+
+This ensures we are just unit testing the behaviour of the routers.
\ No newline at end of file
diff --git a/unit_tests/routers/test_config.py b/unit_tests/routers/test_config.py
index d72459ac..6b172ba3 100644
--- a/unit_tests/routers/test_config.py
+++ b/unit_tests/routers/test_config.py
@@ -1,6 +1,21 @@
+from fastapi import status
 from fastapi.testclient import TestClient
 
 
-def test_get_config(client: TestClient, user_header_token):
-    # TODO: Finish the config tests by adding mock for repo
-    pass
+def test_get_config(client: TestClient, user_header_token, config_service_mock):
+    response = client.get("/api/v1/config", headers=user_header_token)
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    keys = data.keys()
+    assert "geographies" in keys
+    assert "taxonomies" in keys
+    assert "languages" in keys
+    assert config_service_mock.get.call_count == 1
+
+
+def test_get_config_when_db_error(
+    client: TestClient, user_header_token, config_service_mock
+):
+    config_service_mock.throw_repository_error = True
+    response = client.get("/api/v1/config", headers=user_header_token)
+    assert response.status_code == status.HTTP_503_SERVICE_UNAVAILABLE