pubsub: fix permadiff with configuring an empty retry_policy. (#11834)

Author: anavada

mmv1/products/pubsub/Subscription.yaml

@@ -471,6 +471,8 @@ properties:
           A duration in seconds with up to nine fractional digits, terminated by 's'. Example: "3.5s".
         default_from_api: true
         diff_suppress_func: 'tpgresource.DurationDiffSuppress'
+    send_empty_value: true
+    allow_empty_object: true
   - name: 'enableMessageOrdering'
     type: Boolean
     description: |

mmv1/third_party/terraform/services/pubsub/resource_pubsub_subscription_test.go

@@ -36,6 +36,30 @@ func TestAccPubsubSubscription_emptyTTL(t *testing.T) {
 	})
 }
 
+func TestAccPubsubSubscription_emptyRetryPolicy(t *testing.T) {
+	t.Parallel()
+
+	topic := fmt.Sprintf("tf-test-topic-%s", acctest.RandString(t, 10))
+	subscription := fmt.Sprintf("tf-test-sub-%s", acctest.RandString(t, 10))
+
+	acctest.VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccCheckPubsubSubscriptionDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccPubsubSubscription_emptyRetryPolicy(topic, subscription),
+			},
+			{
+				ResourceName:      "google_pubsub_subscription.foo",
+				ImportStateId:     subscription,
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
 func TestAccPubsubSubscription_basic(t *testing.T) {
 	t.Parallel()
 
@@ -494,6 +518,22 @@ resource "google_pubsub_subscription" "foo" {
 `, topic, subscription)
 }
 
+func testAccPubsubSubscription_emptyRetryPolicy(topic, subscription string) string {
+	return fmt.Sprintf(`
+resource "google_pubsub_topic" "foo" {
+  name = "%s"
+}
+
+resource "google_pubsub_subscription" "foo" {
+  name  = "%s"
+  topic = google_pubsub_topic.foo.id
+
+  retry_policy {
+  }
+}
+`, topic, subscription)
+}
+
 func testAccPubsubSubscription_push(topicFoo, saAccount, subscription string) string {
 	return fmt.Sprintf(`
 data "google_project" "project" { }

mmv1/third_party/tgc/tests/data/example_pubsub_subscription.json

@@ -48,8 +48,9 @@
         "pushConfig": {
           "pushEndpoint": "https://example.com/push"
         },
+        "retryPolicy": null,
         "topic": "projects/{{.Provider.project}}/topics/example-pubsub-topic"
       }
     }
   }
-]
+]

mmv1/third_party/tgc/tests/data/example_pubsub_subscription_iam_binding.json

@@ -20,6 +20,7 @@
         "pushConfig": {
           "pushEndpoint": "https://example.com/push"
         },
+        "retryPolicy": null,
         "topic": "projects/{{.Provider.project}}/topics/example-pubsub-topic"
       }
     },
@@ -34,4 +35,4 @@
       ]
     }
   }
-]
+]

mmv1/third_party/tgc/tests/data/example_pubsub_subscription_iam_member.json

@@ -20,6 +20,7 @@
         "pushConfig": {
           "pushEndpoint": "https://example.com/push"
         },
+        "retryPolicy": null,
         "topic": "projects/{{.Provider.project}}/topics/example-pubsub-topic"
       }
     },
@@ -34,4 +35,4 @@
       ]
     }
   }
-]
+]

mmv1/third_party/tgc/tests/data/example_pubsub_subscription_iam_policy.json

@@ -20,6 +20,7 @@
         "pushConfig": {
           "pushEndpoint": "https://example.com/push"
         },
+        "retryPolicy": null,
         "topic": "projects/{{.Provider.project}}/topics/example-pubsub-topic"
       }
     },
@@ -34,4 +35,4 @@
       ]
     }
   }
-]
+]