test: add task validation when using vault secret provider (#26517)

client/allocrunner/taskrunner/secrets/nomad_provider.go

@@ -13,6 +13,8 @@ import (
 	"github.com/mitchellh/mapstructure"
 )
 
+const SecretProviderNomad = "nomad"
+
 type nomadProviderConfig struct {
 	Namespace string `mapstructure:"namespace"`
 }

client/allocrunner/taskrunner/secrets/vault_provider.go

@@ -14,6 +14,8 @@ import (
 )
 
 const (
+	SecretProviderVault = "vault"
+
 	VAULT_KV    = "kv"
 	VAULT_KV_V2 = "kv_v2"
 )

client/allocrunner/taskrunner/secrets_hook.go

@@ -185,13 +185,13 @@ func (h *secretsHook) buildSecretProviders(secretDir string) ([]TemplateProvider
 
 		tmplFile := fmt.Sprintf("temp-%d", idx)
 		switch s.Provider {
-		case "nomad":
+		case secrets.SecretProviderNomad:
 			if p, err := secrets.NewNomadProvider(s, secretDir, tmplFile, h.nomadNamespace); err != nil {
 				multierror.Append(mErr, err)
 			} else {
 				tmplProvider = append(tmplProvider, p)
 			}
-		case "vault":
+		case secrets.SecretProviderVault:
 			if p, err := secrets.NewVaultProvider(s, secretDir, tmplFile); err != nil {
 				multierror.Append(mErr, err)
 			} else {