[8.x] Move tests out of geo ip processor tests (#114656)

modules/ingest-geoip/src/test/java/org/elasticsearch/ingest/geoip/DatabaseTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.ingest.geoip;
+
+import org.elasticsearch.common.util.set.Sets;
+import org.elasticsearch.test.ESTestCase;
+
+import java.util.Set;
+
+import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+
+public class DatabaseTests extends ESTestCase {
+
+    public void testDatabasePropertyInvariants() {
+        // the city database is like a specialization of the country database
+        assertThat(Sets.difference(Database.Country.properties(), Database.City.properties()), is(empty()));
+        assertThat(Sets.difference(Database.Country.defaultProperties(), Database.City.defaultProperties()), is(empty()));
+
+        // the isp database is like a specialization of the asn database
+        assertThat(Sets.difference(Database.Asn.properties(), Database.Isp.properties()), is(empty()));
+        assertThat(Sets.difference(Database.Asn.defaultProperties(), Database.Isp.defaultProperties()), is(empty()));
+
+        // the enterprise database is like these other databases joined together
+        for (Database type : Set.of(
+            Database.City,
+            Database.Country,
+            Database.Asn,
+            Database.AnonymousIp,
+            Database.ConnectionType,
+            Database.Domain,
+            Database.Isp
+        )) {
+            assertThat(Sets.difference(type.properties(), Database.Enterprise.properties()), is(empty()));
+        }
+        // but in terms of the default fields, it's like a drop-in replacement for the city database
+        // n.b. this is just a choice we decided to make here at Elastic
+        assertThat(Database.Enterprise.defaultProperties(), equalTo(Database.City.defaultProperties()));
+    }
+}