Replace string values with ReadPreference constants

Author: GromNaN

tests/FunctionalTestCase.php

@@ -328,7 +328,7 @@ protected function getServerStorageEngine(?ReadPreference $readPreference = null
         $cursor = $this->manager->executeCommand(
             $this->getDatabaseName(),
             new Command(['serverStatus' => 1]),
-            $readPreference ?: new ReadPreference('primary')
+            $readPreference ?: new ReadPreference(ReadPreference::PRIMARY)
         );
 
         $result = current($cursor->toArray());

tests/Operation/AggregateFunctionalTest.php

@@ -315,7 +315,7 @@ public function testReadPreferenceWithinTransaction(): void
 
             $pipeline = [['$match' => ['_id' => ['$lt' => 3]]]];
             $options = [
-                'readPreference' => new ReadPreference('primary'),
+                'readPreference' => new ReadPreference(ReadPreference::PRIMARY),
                 'session' => $session,
             ];
 

tests/Operation/FindFunctionalTest.php

@@ -288,7 +288,7 @@ public function testReadPreferenceWithinTransaction(): void
 
             $filter = ['_id' => ['$lt' => 3]];
             $options = [
-                'readPreference' => new ReadPreference('primary'),
+                'readPreference' => new ReadPreference(ReadPreference::PRIMARY),
                 'session' => $session,
             ];
 

tests/Operation/WatchFunctionalTest.php

@@ -1322,7 +1322,7 @@ public function testOriginalReadPreferenceIsPreservedOnResume(): void
             $this->markTestSkipped('Test does not apply to sharded clusters');
         }
 
-        $readPreference = new ReadPreference('secondary');
+        $readPreference = new ReadPreference(ReadPreference::SECONDARY);
         $options = ['readPreference' => $readPreference] + $this->defaultOptions;
         $operation = new Watch($this->manager, $this->getDatabaseName(), $this->getCollectionName(), [], $options);
 

tests/SpecTests/Context.php

@@ -163,7 +163,7 @@ public static function fromCrud(stdClass $test, $databaseName, $collectionName)
 
         $o->outcomeReadOptions = [
             'readConcern' => new ReadConcern('local'),
-            'readPreference' => new ReadPreference('primary'),
+            'readPreference' => new ReadPreference(ReadPreference::PRIMARY),
         ];
 
         $o->client = self::createTestClient(null, $clientOptions);
@@ -224,7 +224,7 @@ public static function fromTransactions(stdClass $test, $databaseName, $collecti
 
         $o->outcomeReadOptions = [
             'readConcern' => new ReadConcern('local'),
-            'readPreference' => new ReadPreference('primary'),
+            'readPreference' => new ReadPreference(ReadPreference::PRIMARY),
         ];
 
         $clientOptions = isset($test->clientOptions) ? (array) $test->clientOptions : [];

tests/SpecTests/PrimaryStepDownSpecTest.php

@@ -267,7 +267,7 @@ private function dropAndRecreateCollection(): void
 
     private function getTotalConnectionsCreated(?Server $server = null)
     {
-        $server = $server ?: $this->client->getManager()->selectServer(new ReadPreference('primary'));
+        $server = $server ?: $this->client->getManager()->selectServer(new ReadPreference(ReadPreference::PRIMARY));
 
         $cursor = $server->executeCommand(
             $this->getDatabaseName(),
@@ -292,7 +292,7 @@ private function waitForPrimaryReelection(): void
 
             return;
         } catch (DriverException $e) {
-            $this->client->getManager()->selectServer(new ReadPreference('primary'));
+            $this->client->getManager()->selectServer(new ReadPreference(ReadPreference::PRIMARY));
 
             return;
         }

tests/SpecTests/TransactionsSpecTest.php

@@ -324,7 +324,7 @@ private static function killAllSessions(): void
         }
 
         $manager = static::createTestManager();
-        $primary = $manager->selectServer(new ReadPreference('primary'));
+        $primary = $manager->selectServer(new ReadPreference(ReadPreference::PRIMARY));
 
         $servers = $primary->getType() === Server::TYPE_MONGOS
             ? $manager->getServers()