Test that extensions work correctly without runtime config

No NPE in particular; see for example
quarkusio#23422

extensions/hibernate-orm/deployment/src/test/java/io/quarkus/hibernate/orm/config/namedpu/NoRuntimeConfigNamedPUTest.java

@@ -0,0 +1,44 @@
+package io.quarkus.hibernate.orm.config.namedpu;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.metamodel.Bindable;
+
+import io.quarkus.hibernate.orm.PersistenceUnit.PersistenceUnitLiteral;
+import io.quarkus.hibernate.orm.runtime.HibernateOrmRuntimeConfig;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.arc.Arc;
+import io.quarkus.test.QuarkusUnitTest;
+
+/**
+ * Test that Hibernate ORM is able to start even when not providing any runtime property
+ */
+public class NoRuntimeConfigNamedPUTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .withApplicationRoot(jar -> jar.addPackage(MyEntity.class.getPackage().getName()))
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".db-kind", "h2")
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".jdbc.url", "jdbc:h2:mem:test")
+            // For Hibernate ORM, provide only build-time config; rely on defaults for everything else.
+            .overrideConfigKey("quarkus.hibernate-orm.\"pu-1\".datasource", "ds-1")
+            // Disable dev services, since they could interfere with runtime config (in particular the schema generation settings).
+            .overrideConfigKey("quarkus.devservices.enabled", "false");
+
+    @Test
+    public void test() {
+        // Check that runtime config for our PU is indeed missing.
+        HibernateOrmRuntimeConfig config = Arc.container().instance(HibernateOrmRuntimeConfig.class).get();
+        assertThat(config.persistenceUnits).isNullOrEmpty();
+        // Test that Hibernate was started correctly regardless.
+        EntityManagerFactory entityManagerFactory = Arc.container()
+                .instance(EntityManagerFactory.class, new PersistenceUnitLiteral("pu-1")).get();
+        assertThat(entityManagerFactory).isNotNull();
+        assertThat(entityManagerFactory.getMetamodel().getEntities())
+                .extracting(Bindable::getBindableJavaType)
+                .containsExactlyInAnyOrder((Class) MyEntity.class);
+    }
+}

extensions/hibernate-search-orm-elasticsearch/deployment/src/test/java/io/quarkus/hibernate/search/orm/elasticsearch/test/configuration/NoRuntimeConfigNamedPUNamedBackendTest.java

@@ -0,0 +1,54 @@
+package io.quarkus.hibernate.search.orm.elasticsearch.test.configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.metamodel.Bindable;
+
+import io.quarkus.hibernate.search.orm.elasticsearch.runtime.HibernateSearchElasticsearchRuntimeConfig;
+import org.hibernate.search.mapper.orm.entity.SearchIndexedEntity;
+import org.hibernate.search.mapper.orm.mapping.SearchMapping;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.arc.Arc;
+import io.quarkus.hibernate.orm.PersistenceUnit.PersistenceUnitLiteral;
+import io.quarkus.test.QuarkusUnitTest;
+
+/**
+ * Test that Hibernate Search is able to start even when not providing any runtime property.
+ */
+@Disabled("The (build-time) 'version' property is not detected for some reason; I suspect a bug in Quarkus Config when there are two levels of maps in the config.")
+public class NoRuntimeConfigNamedPUNamedBackendTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .withApplicationRoot(jar -> jar.addClass(IndexedEntityInNamedBackend.class))
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".db-kind", "h2")
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".jdbc.url", "jdbc:h2:mem:test")
+            .overrideConfigKey("quarkus.hibernate-orm.\"pu-1\".datasource", "ds-1")
+            .overrideConfigKey("quarkus.hibernate-orm.\"pu-1\".packages",
+                    IndexedEntityInNamedBackend.class.getPackage().getName())
+            // For Hibernate Search, provide only build-time config; rely on defaults for everything else.
+            .overrideConfigKey("quarkus.hibernate-search-orm.\"pu-1\".elasticsearch.\"mybackend\".version", "7")
+            // Disable dev services, since they could interfere with runtime config (in particular the schema management settings).
+            .overrideConfigKey("quarkus.devservices.enabled", "false")
+            // Make runtime config accessible through CDI
+            .overrideConfigKey("quarkus.arc.unremovable-types", HibernateSearchElasticsearchRuntimeConfig.class.getName());
+
+    @Test
+    public void test() {
+        // Check that runtime config for our PU is indeed missing.
+        HibernateSearchElasticsearchRuntimeConfig config = Arc.container()
+                .instance(HibernateSearchElasticsearchRuntimeConfig.class).get();
+        assertThat(config.persistenceUnits).isNullOrEmpty();
+        // Test that Hibernate was started correctly regardless.
+        SearchMapping mapping = Arc.container()
+                .instance(SearchMapping.class, new PersistenceUnitLiteral("pu-1")).get();
+        assertThat(mapping).isNotNull();
+        assertThat(mapping.allIndexedEntities())
+                .extracting(SearchIndexedEntity::javaClass)
+                .containsExactlyInAnyOrder((Class) IndexedEntityInNamedBackend.class);
+    }
+}

extensions/hibernate-search-orm-elasticsearch/deployment/src/test/java/io/quarkus/hibernate/search/orm/elasticsearch/test/configuration/NoRuntimeConfigNamedPUTest.java

@@ -0,0 +1,49 @@
+package io.quarkus.hibernate.search.orm.elasticsearch.test.configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.hibernate.search.mapper.orm.entity.SearchIndexedEntity;
+import org.hibernate.search.mapper.orm.mapping.SearchMapping;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.arc.Arc;
+import io.quarkus.hibernate.orm.PersistenceUnit.PersistenceUnitLiteral;
+import io.quarkus.hibernate.search.orm.elasticsearch.runtime.HibernateSearchElasticsearchRuntimeConfig;
+import io.quarkus.test.QuarkusUnitTest;
+
+/**
+ * Test that Hibernate Search is able to start even when not providing any runtime property.
+ */
+public class NoRuntimeConfigNamedPUTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .withApplicationRoot(jar -> jar.addClass(IndexedEntity.class))
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".db-kind", "h2")
+            .overrideConfigKey("quarkus.datasource.\"ds-1\".jdbc.url", "jdbc:h2:mem:test")
+            .overrideConfigKey("quarkus.hibernate-orm.\"pu-1\".datasource", "ds-1")
+            .overrideConfigKey("quarkus.hibernate-orm.\"pu-1\".packages",
+                    IndexedEntity.class.getPackage().getName())
+            // For Hibernate Search, provide only build-time config; rely on defaults for everything else.
+            .overrideConfigKey("quarkus.hibernate-search-orm.\"pu-1\".elasticsearch.version", "7")
+            // Disable dev services, since they could interfere with runtime config (in particular the schema management settings).
+            .overrideConfigKey("quarkus.devservices.enabled", "false")
+            // Make runtime config accessible through CDI
+            .overrideConfigKey("quarkus.arc.unremovable-types", HibernateSearchElasticsearchRuntimeConfig.class.getName());
+
+    @Test
+    public void test() {
+        // Check that runtime config for our PU is indeed missing.
+        HibernateSearchElasticsearchRuntimeConfig config = Arc.container()
+                .instance(HibernateSearchElasticsearchRuntimeConfig.class).get();
+        assertThat(config.persistenceUnits).isNullOrEmpty();
+        // Test that Hibernate was started correctly regardless.
+        SearchMapping mapping = Arc.container()
+                .instance(SearchMapping.class, new PersistenceUnitLiteral("pu-1")).get();
+        assertThat(mapping).isNotNull();
+        assertThat(mapping.allIndexedEntities())
+                .extracting(SearchIndexedEntity::javaClass)
+                .containsExactlyInAnyOrder((Class) IndexedEntity.class);
+    }
+}