Add Terraform and Helm tests with Terratest

Useful to check if Terraform configuration is valid and verify different
variables used by helm templates.

build/includes/terraform.mk

@@ -83,3 +83,10 @@ endif
 gcloud-terraform-destroy-cluster:
 	$(DOCKER_RUN) bash -c 'cd $(mount_path)/build/terraform/gke && \
 	 terraform destroy -target module.helm_agones.helm_release.agones -auto-approve && sleep 60 && terraform destroy -auto-approve'
+
+terraform-test: $(ensure-build-image)
+ifndef GCP_PROJECT
+	$(eval GCP_PROJECT=$(shell sh -c "gcloud config get-value project 2> /dev/null"))
+endif
+	$(DOCKER_RUN) bash -c 'cd $(mount_path)/test/terraform && GOPATH="$(PWD)/.." go test \
+	-timeout 1h -project $(GCP_PROJECT) $(ARGS)'

test/terraform/gke_test.go

@@ -0,0 +1,60 @@
+// Copyright 2020 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test
+
+import (
+	"flag"
+	"testing"
+	"time"
+
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	"github.com/stretchr/testify/assert"
+)
+
+var project string
+
+func TestTerraformGKEInstallConfig(t *testing.T) {
+	t.Logf("Using project %s\n", project)
+	terraformOptions := &terraform.Options{
+		TerraformDir: "../../build/terraform/gke/",
+		Vars: map[string]interface{}{
+			"project":     project,
+			"name":        "terratest-cluster",
+			"values_file": "",
+		},
+	}
+
+	defer destroy(t, terraformOptions)
+
+	terraform.InitAndApply(t, terraformOptions)
+
+	output := terraform.Output(t, terraformOptions, "host")
+	assert.Contains(t, output, "https://")
+}
+
+func destroy(t *testing.T, options *terraform.Options) {
+	options.Targets = []string{"module.helm_agones.helm_release.agones"}
+	terraform.Destroy(t, options)
+	time.Sleep(30 * time.Second)
+	options.Targets = []string{}
+	terraform.Destroy(t, options)
+}
+
+func TestMain(m *testing.M) {
+	projectFlag := flag.String("project", "agones", "name of the proejct")
+	flag.Parse()
+	project = *projectFlag
+	m.Run()
+}

test/terraform/go.mod

@@ -0,0 +1,10 @@
+module github.com/agones/agones/test/terraform
+
+go 1.13
+
+require (
+	github.com/gruntwork-io/terratest v0.26.6
+	github.com/stretchr/testify v1.5.1
+	k8s.io/api v0.17.0
+	k8s.io/apiextensions-apiserver v0.15.7
+)