[terraform-ci] Added bats (#124)

* Added bats

.github/workflows/ci-terraform.yml

@@ -61,6 +61,44 @@ jobs:
         shell: bash
         run: git diff --exit-code
 
+  bats:
+    runs-on: ubuntu-latest
+    container: cloudposse/test-harness:latest
+    env:
+      MAKE_INCLUDES: Makefile
+      TF_PLUGIN_CACHE_DIR: /tmp
+      BATS_MODULE_TESTS: input-descriptions module-pinning provider-pinning output-descriptions
+      BATS_EXAMPLES_TESTS: input-descriptions lint output-descriptions
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run tests on modified modules
+        shell: bash -x -e -o pipefail {0}
+        run: |
+          # when running in test-harness, need to mark the directory safe for git operations
+          make git-safe-directory
+          MODIFIED_MODULES=($(find . -type f -name "*.tf" | xargs -I{} dirname {} | sort | uniq | grep  -v ^./.git/ || true))
+          pass=true
+          for relative_dir in "${MODIFIED_MODULES[@]}"; do
+            dir=$(realpath $relative_dir)
+            printf "\n\nBegin testing in $dir\n"
+            (
+              status=pass
+              cd $dir
+              [[ $relative_dir =~ ./examples/.* ]] && tests=$BATS_EXAMPLES_TESTS || tests=$BATS_MODULE_TESTS
+              for test in $tests; do
+                printf "\n\nRunning ${test} in $dir\n"
+                bats -t /test/terraform/${test}.bats || status=fail
+              done
+              [[ $status == "pass" ]]
+            ) || pass=false
+            printf "\n\nEnd of testing in $dir\n\n\n"
+          done
+          [[ $pass == "true" ]]
+
   lint-find-dirs:
     name: Find modules
     runs-on: ${{ fromJSON(inputs.runs-on) }}