HSEARCH-3825 Test SearchIndexingPlan.purge with a custom routing key mapping

Author: yrodiere

integrationtest/mapper/pojo-base/src/test/java/org/hibernate/search/integrationtest/mapper/pojo/routing/RoutingBaseIT.java

@@ -27,6 +27,7 @@
 import org.hibernate.search.util.impl.integrationtest.common.rule.BackendMock;
 import org.hibernate.search.util.impl.integrationtest.common.rule.StubSearchWorkBehavior;
 import org.hibernate.search.util.impl.integrationtest.common.stub.backend.document.StubDocumentNode;
+import org.hibernate.search.util.impl.test.annotation.TestForIssue;
 
 import org.junit.Before;
 import org.junit.Rule;
@@ -104,6 +105,21 @@ public void index_multiTenancy() {
 		}
 	}
 
+	@Test
+	@TestForIssue(jiraKey = "HSEARCH-3825")
+	public void purge() {
+		try ( SearchSession session = mapping.createSession() ) {
+			session.indexingPlan().purge( IndexedEntity.class, 42, "category_2" );
+
+			backendMock.expectWorks( IndexedEntity.INDEX )
+					.delete( b -> b
+							.identifier( "42" )
+							.routingKey( "category_2" )
+					)
+					.processedThenExecuted();
+		}
+	}
+
 	@Test
 	public void search() {
 		try ( SearchSession session = mapping.createSession() ) {