Add gitlab CI application test

.gitlab-ci.yml

 stages:
   - build
+  - application-test
 
 consentProvider_image:
   stage: build
@@ -34,3 +35,37 @@ loginProvider_image:
   only:
     changes:
       - login_provider/*
+
+loginProviderCiTest_image:
+  stage: build
+    DOCKER_DRIVER: overlay2
+  image: docker:stable
+  services:
+    - docker:18-dind  # FIXME This is an older version of DIND. Update when gitlab-runner fixes https://gitlab.com/gitlab-org/gitlab-runner/issues/4501
+  before_script:
+    - docker info
+  script:
+    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+    - docker build -t ${CI_REGISTRY_IMAGE}/login_provider_ci_test:${CI_COMMIT_REF_NAME} login_provider/test/
+    - docker push ${CI_REGISTRY_IMAGE}/login_provider_ci_test:${CI_COMMIT_REF_NAME}
+  only:
+    changes:
+      - login_provider/*
+
+behave-login:
+  stage: application-test
+  services:
+    - name: ${CI_REGISTRY_IMAGE}/login_provider:${CI_COMMIT_REF_NAME}
+      alias: login_provider
+  image: ${CI_REGISTRY_IMAGE}/login_provider_ci_test:${CI_COMMIT_REF_NAME}
+  script:
+    - cd login_provider/test/behave/
+    - python -m behave -D url=http://login_provider -D email=example@oas.example.net -D password=password
+  artifacts:
+    paths:
+      - login_provider/test/behave/screenshots/
+    expire_in: 1 month
+    when: on_failure
+  only:
+    changes:
+      - login_provider/*

login_provider/test/Dockerfile

+FROM alpine:3.9
+
+LABEL name="Login_provider CI test image"
+
+RUN apk --no-cache add \
+  chromium \
+  chromium-chromedriver \
+  python3-dev \
+  python3-pip
+
+RUN pip3 install behave behave_webdriver