add pull subscription expiration_policy test

Author: ktinubu

examples/simple/main.tf

@@ -37,9 +37,10 @@ module "pubsub" {
       enable_exactly_once_delivery = true
     },
     {
-      name            = "pull2"
-      minimum_backoff = "10s"
-      maximum_backoff = "600s"
+      name              = "pull2"
+      minimum_backoff   = "10s"
+      maximum_backoff   = "600s"
+      expiration_policy = "1209600s" // two weeks
     },
   ]
 

test/integration/simple/simple_test.go

@@ -67,6 +67,7 @@ func TestSimple(t *testing.T) {
 		op = gcloud.Runf(t, "pubsub subscriptions describe pull2 --project=%s", projectId)
 		assert.Equal("600s", op.Get("retryPolicy.maximumBackoff").String(), "has expected maximum_backoff")
 		assert.Equal("10s", op.Get("retryPolicy.minimumBackoff").String(), "has expected minimum_backoff")
+		assert.Equal("1209600s", op.Get("expirationPolicy.ttl").String(), "has expected expiration_policy")
 
 		op = gcloud.Runf(t, "pubsub schemas describe example --project=%s", projectId)
 		assert.Equal(fmt.Sprintf("projects/%s/schemas/example", projectId), op.Get("name").String(), "has expected name")