tests: introduce golden tests in kong chart

.gitattributes

@@ -0,0 +1 @@
+charts/kong/tests/testdata/golden/*.yaml linguist-generated=true

.github/workflows/release-pr.yaml

@@ -118,6 +118,7 @@ jobs:
 
       - name: cleanup integration tests (cleanup)
         run: ./scripts/test-env.sh cleanup
+
   oldversion-integration-test:
     runs-on: ubuntu-latest
     env:
@@ -159,6 +160,26 @@ jobs:
       - name: cleanup integration tests (cleanup)
         run: ./scripts/test-env.sh cleanup
 
+  go-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: setup helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.11.0
+
+      - name: setup golang
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: ./charts/kong/tests/go.mod
+
+      - name: Run tests
+        run: make test
+
   # Workaround to allow checking the matrix tests as required tests without adding the individual cases
   # Ref: https://github.com/orgs/community/discussions/26822#discussioncomment-3305794
   passed:
@@ -168,6 +189,7 @@ jobs:
       - lint-test
       - integration-test
       - oldversion-integration-test
+      - go-tests
     if: always()
     steps:
       - if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}

Makefile

@@ -22,3 +22,16 @@ lint.charts.kong:
 
 lint.shellcheck:
 	shellcheck ./scripts/*
+
+KONG_CHART_GO_TEST_MODULE=charts/kong/tests
+TEST_GOLDEN_TESTCASE_NAME=TestGolden
+.PHONY: test
+test:
+	cd $(KONG_CHART_GO_TEST_MODULE) && \
+	go test ./...
+
+.PHONY: test.golden.update
+test.golden.update:
+	cd $(KONG_CHART_GO_TEST_MODULE) && \
+	rm testdata/golden/* && \
+	go test -run $(TEST_GOLDEN_TESTCASE_NAME) -update-golden

charts/kong/tests/go.mod

@@ -0,0 +1,69 @@
+module github.com/kong/charts/kong/tests
+
+go 1.21.0
+
+require (
+	github.com/gruntwork-io/terratest v0.46.7
+	github.com/stretchr/testify v1.8.4
+)
+
+require (
+	github.com/aws/aws-sdk-go v1.44.122 // indirect
+	github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
+	github.com/ghodss/yaml v1.0.0 // indirect
+	github.com/go-errors/errors v1.0.2-0.20180813162953-d98b870cc4e0 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.1 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
+	github.com/go-sql-driver/mysql v1.4.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.1.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/gruntwork-io/go-commons v0.8.0 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.0 // indirect
+	github.com/imdario/mergo v0.3.11 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-zglob v0.0.2-0.20190814121620-e3c945676326 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/moby/spdystream v0.2.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pquerna/otp v1.2.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/urfave/cli v1.22.2 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/oauth2 v0.7.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/term v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.27.2 // indirect
+	k8s.io/apimachinery v0.27.2 // indirect
+	k8s.io/client-go v0.27.2 // indirect
+	k8s.io/klog/v2 v2.90.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect
+	k8s.io/utils v0.0.0-20230209194617-a36077c30491 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
+)