#11298 Added missing user mock for EditorialReminderTest (#11299)

Author: touhidurabir

tests/jobs/email/EditorialReminderTest.php

@@ -95,11 +95,20 @@ public function testRunSerializedJob(): void
 
         app()->instance('context', $contextServiceMock);
 
+        $userMock = Mockery::mock(\PKP\user\User::class)
+            ->makePartial()
+            ->shouldReceive([
+                'getId' => 0,
+                'getFullName' => 'Test User',
+            ])
+            ->withAnyArgs()
+            ->getMock();
+
         $userRepoMock = Mockery::mock(app(UserRepository::class))
             ->makePartial()
             ->shouldReceive('get')
             ->withAnyArgs()
-            ->andReturn(new \PKP\user\User)
+            ->andReturn($userMock)
             ->getMock();
 
         app()->instance(UserRepository::class, $userRepoMock);