Improve error when creating domain label lists for non-existent TLDs (#1112)

* Improve error message when creating domain label lists for non-existent TLDs

core/src/test/java/google/registry/tools/CreateReservedListCommandTest.java

@@ -113,7 +113,9 @@ class CreateReservedListCommandTest
 
   @Test
   void testNamingRules_tldThatDoesNotExist_failsWithoutOverride() {
-    runNameTestExpectedFailure("footld_reserved-list", "TLD footld does not exist");
+    runNameTestExpectedFailure(
+        "footld_reserved-list",
+        "The name must be in the format {tld|common}_list-name, yet TLD footld does not exist");
   }
 
   @Test
@@ -153,7 +155,9 @@ class CreateReservedListCommandTest
 
   @Test
   void testNamingRules_commonAsListName_failsWithoutOverride() {
-    runNameTestExpectedFailure("invalidtld_common", "TLD invalidtld does not exist");
+    runNameTestExpectedFailure(
+        "invalidtld_common",
+        "The name must be in the format {tld|common}_list-name, yet TLD invalidtld does not exist");
   }
 
   @Test

core/src/test/java/google/registry/tools/server/CreatePremiumListActionTest.java

@@ -70,6 +70,18 @@ public class CreatePremiumListActionTest {
     assertThat(error).contains("A premium list of this name already exists");
   }
 
+  @Test
+  void test_nonExistentTld_fails() {
+    action.name = "zanzibar";
+    action.inputData = "zanzibar,USD 100";
+    action.run();
+    assertThat(response.getResponseMap().get("status")).isEqualTo("error");
+    assertThat(response.getResponseMap().get("error").toString())
+        .isEqualTo(
+            "Premium names must match the name of the TLD they are intended to be used on"
+                + " (unless --override is specified), yet TLD zanzibar does not exist");
+  }
+
   @Test
   void test_nonExistentTld_successWithOverride() {
     action.name = "zanzibar";