add a test for envoy_dns_discovery_type

jobspec/parse_test.go

@@ -1563,6 +1563,7 @@ func TestParse(t *testing.T) {
 										"listener2": {Name: "listener2", Address: "10.0.0.2", Port: 8889},
 									},
 									EnvoyGatewayNoDefaultBind: true,
+									EnvoyDNSDiscoveryType:     "LOGICAL_DNS",
 									Config:                    map[string]interface{}{"foo": "bar"},
 								},
 								Terminating: &api.ConsulTerminatingConfigEntry{

jobspec/test-fixtures/tg-service-connect-gateway-terminating.hcl

@@ -20,6 +20,7 @@ job "connect_gateway_terminating" {
             }
 
             envoy_gateway_no_default_bind = true
+            envoy_dns_discovery_type      = "LOGICAL_DNS"
 
             config {
               foo = "bar"