👷 Add unit testing

Add unit testing step to ci

.circleci/config.yml

@@ -25,6 +25,17 @@ jobs:
       - run: yarn lint
       - run: yarn format:check
 
+  back-test-unit:
+    <<: *shared-config
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependencies-{{ checksum "package.json" }}-v1
+      - run:
+          command: yarn test
+          environment:
+            DATABASE_URL: postgres://psqluer:psqlpassword@localhost:5432/psqluer
+
 workflows:
   version: 2
   build-test-and-lint:
@@ -32,4 +43,7 @@ workflows:
       - build
       - lint:
           requires :
+            - build
+      - back-test-unit:
+          requires:
             - build