Fixes problem with rebinding singletons.

src/Http/FakeHttp.php

@@ -138,6 +138,7 @@ public function withMiddleware(string ...$middleware): self
     public function withoutMiddleware(string ...$middleware): self
     {
         foreach ($middleware as $name) {
+            $this->container->removeBinding($name);
             $this->container->bindSingleton(
                 $name,
                 new class implements MiddlewareInterface {

src/TestCase.php

@@ -128,6 +128,7 @@ public function makeApp(array $env = []): AbstractKernel
         $environment = new Environment($env);
 
         $app = $this->createAppInstance();
+        $app->getContainer()->removeBinding(EnvironmentInterface::class);
         $app->getContainer()->bindSingleton(EnvironmentInterface::class, $environment);
 
         foreach ($this->beforeInit as $callback) {

src/Traits/InteractsWithCore.php

@@ -131,6 +131,8 @@ public function getRegisteredBootloaders(): array
      */
     public function mockContainer(string $alias, ?string $interface = null): \Mockery\MockInterface
     {
+        $this->getContainer()->removeBinding($alias);
+
         $this->getContainer()->bindSingleton(
             $alias,
             $mock = \Mockery::mock($interface ?? $alias)
@@ -152,6 +154,7 @@ public function withEnvironment(array $env): self
             array_merge($current, $env)
         );
 
+        $this->getContainer()->removeBinding(EnvironmentInterface::class);
         $this->getContainer()->bind(EnvironmentInterface::class, $this->environment);
 
         return $this;

src/Traits/InteractsWithEvents.php

@@ -11,6 +11,7 @@ trait InteractsWithEvents
 {
     public function fakeEventDispatcher(array $eventsToFake = []): FakeEventDispatcher
     {
+        $this->getContainer()->removeBinding(EventDispatcherInterface::class);
         $this->getContainer()->bindSingleton(
             EventDispatcherInterface::class,
             $dispatcher = $this->getContainer()->make(

src/Traits/InteractsWithExceptions.php

@@ -13,6 +13,7 @@ trait InteractsWithExceptions
 {
     protected function withoutExceptionHandling(): void
     {
+        $this->getContainer()->removeBinding(ExceptionHandlerInterface::class);
         $this->getContainer()->bind(
             ExceptionHandlerInterface::class,
             new class implements ExceptionHandlerInterface {

src/Traits/InteractsWithMailer.php

@@ -19,6 +19,7 @@ public function fakeMailer(): FakeMailer
             }
         }
 
+        $container->removeBinding(MailerInterface::class);
         $container->bindSingleton(
             MailerInterface::class,
             $mailer = new FakeMailer()

src/Traits/InteractsWithQueue.php

@@ -19,6 +19,7 @@ public function fakeQueue(): FakeQueueManager
             }
         }
 
+        $container->removeBinding(QueueConnectionProviderInterface::class);
         $container->bindSingleton(
             QueueConnectionProviderInterface::class,
             $manager = $container->get(FakeQueueManager::class)

src/Traits/InteractsWithScaffolder.php

@@ -79,9 +79,10 @@ public function mockScaffolder(string $command, array $args, \Closure $expected)
 
         $this->getConsole()->run($command, new ArrayInput($args), $output = new BufferedOutput());
 
-        $originalFiles !== null
-            ? $this->getContainer()->bind(FilesInterface::class, $originalFiles)
-            : $this->getContainer()->removeBinding(FilesInterface::class);
+        $this->getContainer()->removeBinding(FilesInterface::class);
+        if ($originalFiles !== null) {
+            $this->getContainer()->bind(FilesInterface::class, $originalFiles);
+        }
 
         return $output->fetch();
     }