Add tests

.cirrus.yml

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+gcp_credentials: ENCRYPTED[!17c59813193e86cc337bce848b358412b90f50bc5fe1b8b39d363cdf14a41ebe76cfba0482e7f81d076994b9f6dbfb4c!]
+ 
+env:
+  CIRRUS_CLONE_DEPTH: 1
+  # Use bash (instead of sh on linux or cmd.exe on windows)
+  CIRRUS_SHELL: bash
+
+container_definition: &CONTAINER_DEFINITION
+  builder_image_project: language-team
+  builder_image_name: docker-builder-lt-v1
+  cluster_name: cirrus-ci-lt-cluster
+  zone: us-central1-a
+  namespace: default
+  use_in_memory_disk: true
+
+tests_task:
+  gke_container:
+    dockerfile: Dockerfile
+    <<: *CONTAINER_DEFINITION   
+    dockerfile: Dockerfile
+    cpu: 1
+    memory: 1G
+  tests_script:
+    - ./tests.sh

Dockerfile

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+FROM alpine
+
+RUN apk add --update --no-cache bash curl jq
+
+CMD ["sh"]

tests.sh

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+#!/bin/bash
+echo "Test metadata.json"
+
+exit_code=0
+
+for dir in rules/*
+do
+    dir=${dir%*/} 
+    echo ${dir##*/}
+    if test -f "$dir/metadata.json"; then
+      echo "$FILE exists."
+      HAS_TITLE=`cat $dir/metadata.json | jq 'has("title")'`
+      if [ "$HAS_TITLE" != "true" ]; then
+        echo "$dir/metadata.json has no title"
+        exit_code=1
+      fi
+    else
+      echo "no $dir/metadata.json"
+      exit_code=1
+    fi
+done
+
+exit $exit_code