Run tests with MongoDB 8.0 replica set

.github/workflows/continuous-integration.yml

@@ -62,6 +62,14 @@ jobs:
             dependencies: "highest"
             symfony-version: "stable"
             proxy: "lazy-ghost"
+          # Test with a 8.0 replica set
+          - topology: "replica_set"
+            php-version: "8.2"
+            mongodb-version: "8.0"
+            driver-version: "stable"
+            dependencies: "highest"
+            symfony-version: "stable"
+            proxy: "lazy-ghost"
           # Test with ProxyManager
           - php-version: "8.2"
             mongodb-version: "6.0"

tests/Doctrine/ODM/MongoDB/Tests/Functional/ReadPreferenceTest.php

@@ -14,6 +14,8 @@
 use MongoDB\Driver\WriteConcern;
 use PHPUnit\Framework\Attributes\DataProvider;
 
+use function usleep;
+
 /** @phpstan-type ReadPreferenceTagShape array{dc?: string, usage?: string} */
 class ReadPreferenceTest extends BaseTestCase
 {
@@ -57,7 +59,13 @@ public function testHintIsSetOnQuery(string $readPreference, array $tags = []):
 
         $this->assertReadPreferenceHint($readPreference, $query->getQuery()['readPreference'], $tags);
 
-        $user = $query->getSingleResult();
+        $retries = 0;
+        do {
+            // Wait a bit to ensure replication has caught up.
+            usleep(1_000 * $retries);
+            $user = $query->getSingleResult();
+        } while ($user === null && $retries++ < 100);
+
         self::assertInstanceOf(User::class, $user);
 
         $groups = $user->getGroups();

tests/Doctrine/ODM/MongoDB/Tests/Functional/TimeSeriesTest.php

@@ -41,7 +41,7 @@ public function testCreateTimeSeriesDocumentWithoutId(): void
         $document->metadata = 'energy';
 
         $this->dm->persist($document);
-        $this->dm->flush();
+        $this->dm->flush(['withTransaction' => false]);
 
         $this->assertCount(1, $this->dm->getDocumentCollection(TimeSeriesDocument::class)->find());
     }
@@ -57,7 +57,7 @@ public function testCreateTimeSeriesDocumentWithId(): void
         $document->metadata = 'energy';
 
         $this->dm->persist($document);
-        $this->dm->flush();
+        $this->dm->flush(['withTransaction' => false]);
 
         $this->assertCount(1, $this->dm->getDocumentCollection(TimeSeriesDocument::class)->find());
     }