tests: add initial test for exposed dockerfile port

tests/unit/scheduler-k3s-1.bats

@@ -32,3 +32,28 @@ teardown_() {
 
   INGRESS_CLASS=nginx TAINT_SCHEDULING=true install_k3s
 }
+
+@test "(scheduler-k3s) deploy dockerfile exposed port" {
+  if [[ -z "$DOCKERHUB_USERNAME" ]] || [[ -z "$DOCKERHUB_TOKEN" ]]; then
+    skip "skipping due to missing docker.io credentials DOCKERHUB_USERNAME:DOCKERHUB_TOKEN"
+  fi
+
+  INGRESS_CLASS=nginx install_k3s
+
+  run /bin/bash -c "dokku apps:create $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku domains:set $TEST_APP $TEST_APP.dokku.me"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku git:from-image $TEST_APP metabase/metabase:latest"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  assert_http_localhost_response "http" "$TEST_APP.dokku.me" "80" "" "python/http.server"
+}