Add tests for default sorting with MongoDB

Smoke test for spring-projects/spring-data-mongodb#4744

data/data-mongodb/src/appTest/java/com/example/data/mongodb/DataMongoDbApplicationAotTests.java

@@ -88,4 +88,12 @@ void findByLastName(AssertableOutput output) {
 		});
 	}
 
+	@Test
+	void findWithDefaultSort(AssertableOutput output) {
+		Awaitility.await().atMost(Duration.ofSeconds(10)).untilAsserted(() -> {
+			assertThat(output).hasSingleLineContaining("annotated-query-default-sort(): [last-3, last-2, last-1]");
+			assertThat(output).hasSingleLineContaining("derived-query-default-sort(): [last-3, last-2, last-1]");
+		});
+	}
+
 }

data/data-mongodb/src/main/java/com/example/data/mongodb/CLR.java

@@ -6,6 +6,7 @@
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import org.bson.Document;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -61,18 +62,12 @@ public void run(String... args) {
 		runQueryByExample(product1);
 		runInTransaction(product1);
 
-		personRepository.save(new Person("first-1", "last-1"));
-		personRepository.save(new Person("first-2", "last-2"));
-		personRepository.save(new Person("first-3", "last-3"));
-
-		for (Person person : this.personRepository.findAll()) {
-			System.out.printf("findAll(): %s%n", person);
-		}
-
-		for (Person person : this.personRepository.findByLastname("last-3")) {
-			System.out.printf("findByLastname(): %s%n", person);
-		}
+		Person person1 = new Person("first-1", "last-1");
+		Person person2 = new Person("first-2", "last-2");
+		Person person3 = new Person("first-3", "last-3");
 
+		runDerivedFinder(person1, person2, person3);
+		runQueriesWithDefaultSort(person1, person2, person3);
 	}
 
 	// Prepare Collections to avoid timeouts on slow ci/docker/...
@@ -324,6 +319,39 @@ private void runInTransaction(LineItem product1) {
 		log("-----------------\n\n\n");
 	}
 
+	private void runDerivedFinder(Person person1, Person person2, Person person3) {
+
+		log("---- DERIVED FINDER ----");
+		personRepository.deleteAll();
+		personRepository.saveAll(List.of(person1, person2, person3));
+
+		for (Person person : this.personRepository.findAll()) {
+			System.out.printf("findAll(): %s%n", person);
+		}
+
+		for (Person person : this.personRepository.findByLastname("last-3")) {
+			System.out.printf("findByLastname(): %s%n", person);
+		}
+		log("-----------------\n\n\n");
+	}
+
+	private void runQueriesWithDefaultSort(Person person1, Person person2, Person person3) {
+
+		log("---- DEFAULT SORT ----");
+		personRepository.deleteAll();
+		personRepository.saveAll(List.of(person1, person2, person3));
+
+		List<Person> annotatedQueryResult = this.personRepository.findAndSortPersonsDescByLastnameViaAnnotation("last");
+		System.out.printf("annotated-query-default-sort(): %s",
+				annotatedQueryResult.stream().map(Person::getLastname).collect(Collectors.toList()));
+
+		List<Person> derivedQueryResult = this.personRepository.findWithDefaultSortByLastnameStartingWith("last");
+		System.out.printf("derived-query-default-sort(): %s",
+				derivedQueryResult.stream().map(Person::getLastname).collect(Collectors.toList()));
+
+		log("-----------------\n\n\n");
+	}
+
 	private Order newOrder(String customerId, LineItem... items) {
 		return newOrder(customerId, new Date(), items);
 	}

data/data-mongodb/src/main/java/com/example/data/mongodb/PersonRepository.java

@@ -17,10 +17,17 @@
 
 import java.util.List;
 
+import org.springframework.data.mongodb.repository.Query;
 import org.springframework.data.repository.ListCrudRepository;
 
 public interface PersonRepository extends ListCrudRepository<Person, String> {
 
 	List<Person> findByLastname(String lastname);
 
+	@Query(value = "{ 'lastname' : { '$regex' : '?0.*'} }", sort = "{ 'lastname' : -1 }")
+	List<Person> findAndSortPersonsDescByLastnameViaAnnotation(String lastname);
+
+	@Query(sort = "{ 'lastname' : -1 }")
+	List<Person> findWithDefaultSortByLastnameStartingWith(String lastname);
+
 }