diff --git a/CHANGELOG.md b/CHANGELOG.md
index 100c45a6..27ea28dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 - Update to Laravel 10
 - Update to PHPUnit 10
 
+### Alert
+- Messages are now translated at read time ([#1156](https://github.com/userfrosting/UserFrosting/pull/1156), [#811](https://github.com/userfrosting/UserFrosting/issues/811)). Messages will be translated when using `messages` and `getAndClearMessages`. `addMessage` now accept the optional placeholders, which will be stored with the alert message. `addMessageTranslated` is **deprecated**. 
+- Translator is not optional anymore. `setTranslator` method has been removed.
+
 ## [5.0.0](https://github.com/userfrosting/framework/compare/4.6.1...5.0.0)
 With version 5, this repo can be used as a bare bone Slim & Symfony Console application. It include the necessary routing class, [PHP-DI](https://php-di.org) as the Dependency Injection Container, a PSR EventDispatcher, etc. SprinkleManager has also been moved from Core/System Sprinkle and completely rewritten. 
 
diff --git a/src/Alert/AlertStream.php b/src/Alert/AlertStream.php
index 14559bd6..dee90a2d 100644
--- a/src/Alert/AlertStream.php
+++ b/src/Alert/AlertStream.php
@@ -12,7 +12,6 @@
 
 namespace UserFrosting\Alert;
 
-use RuntimeException;
 use UserFrosting\Fortress\ServerSideValidator;
 use UserFrosting\I18n\Translator;
 
@@ -24,46 +23,29 @@ abstract class AlertStream
     /**
      * Create a new message stream.
      *
-     * @param string          $messagesKey
-     * @param Translator|null $translator
+     * @param Translator $translator
      */
     public function __construct(
-        protected string $messagesKey,
-        protected ?Translator $translator = null
+        protected Translator $translator
     ) {
     }
 
-    /**
-     * Set the translator to be used for all message streams.  Must be done
-     * before `addMessageTranslated` can be used.
-     *
-     * @param Translator|null $translator
-     *
-     * @return static
-     */
-    public function setTranslator(?Translator $translator = null): static
-    {
-        $this->translator = $translator;
-
-        return $this;
-    }
-
     /**
      * Adds a raw text message to the cache message stream.
      *
-     * @param string $type    The type of message, indicating how it will be styled when outputted. Should be set to "success", "danger", "warning", or "info".
-     * @param string $message The message to be added to the message stream.
+     * @param string      $type         The type of message, indicating how it will be styled when outputted. Should be set to "success", "danger", "warning", or "info".
+     * @param string      $message      The message to be added to the message stream.
+     * @param mixed[]|int $placeholders An optional hash of placeholder names => placeholder values to substitute into the translated message.
      *
      * @return static
      */
-    public function addMessage(string $type, string $message): static
+    public function addMessage(string $type, string $message, array|int $placeholders = []): static
     {
-        $messages = $this->messages();
-        $messages[] = [
-            'type'    => $type,
-            'message' => $message,
-        ];
-        $this->saveMessages($messages);
+        $this->storeMessage([
+            'type'         => $type,
+            'message'      => $message,
+            'placeholders' => $placeholders,
+        ]);
 
         return $this;
     }
@@ -72,22 +54,16 @@ public function addMessage(string $type, string $message): static
      * Adds a text message to the cache message stream, translated into the currently selected language.
      *
      * @param string      $type         The type of message, indicating how it will be styled when outputted.  Should be set to "success", "danger", "warning", or "info".
-     * @param string      $messageId    The message id for the message to be added to the message stream.
+     * @param string      $message      The message id for the message to be added to the message stream.
      * @param mixed[]|int $placeholders An optional hash of placeholder names => placeholder values to substitute into the translated message.
      *
-     * @throws RuntimeException
-     *
      * @return static
+     *
+     * @deprecated 5.1 Use `addMessage` instead.
      */
-    public function addMessageTranslated(string $type, string $messageId, array|int $placeholders = []): static
+    public function addMessageTranslated(string $type, string $message, array|int $placeholders = []): static
     {
-        if ($this->translator === null) {
-            throw new RuntimeException('No translator has been set!  Please call MessageStream::setTranslator first.');
-        }
-
-        $message = $this->translator->translate($messageId, $placeholders);
-
-        return $this->addMessage($type, $message);
+        return $this->addMessage($type, $message, $placeholders);
     }
 
     /**
@@ -97,7 +73,7 @@ public function addMessageTranslated(string $type, string $messageId, array|int
      * This is useful, because typically we don't want to view the same messages more than once.
      * Returns an array of messages, each of which is itself an array containing "type" and "message" fields.
      *
-     * @return array<int, array{type: string, message: string}>
+     * @return array<int, array{type: string, message: string, placeholders: mixed[]|int}>
      */
     public function getAndClearMessages(): array
     {
@@ -107,6 +83,19 @@ public function getAndClearMessages(): array
         return $messages;
     }
 
+    /**
+     * Get the messages from this message stream.
+     *
+     * @return array<int, array{type: string, message: string, placeholders: mixed[]|int}>
+     */
+    public function messages(): array
+    {
+        $messages = $this->retrieveMessages();
+        $messages = $this->translateMessages($messages);
+
+        return $messages;
+    }
+
     /**
      * Add error messages from a ServerSideValidator object to the message stream.
      *
@@ -123,21 +112,29 @@ public function addValidationErrors(ServerSideValidator $validator): void
     }
 
     /**
-     * Return the translator for this message stream.
+     * Translates messages that have a message id instead of a message.
      *
-     * @return Translator|null The translator for this message stream.
+     * @param array<int, array{type: string, message: string, placeholders: mixed[]|int}> $messages
+     *
+     * @return array<int, array{type: string, message: string, placeholders: mixed[]|int}>
      */
-    public function translator(): ?Translator
+    protected function translateMessages(array $messages): array
     {
-        return $this->translator;
+        $translated = [];
+        foreach ($messages as $message) {
+            $message['message'] = $this->translator->translate($message['message'], $message['placeholders']);
+            $translated[] = $message;
+        }
+
+        return $translated;
     }
 
     /**
      * Get the messages from this message stream.
      *
-     * @return array<int, array{type: string, message: string}> An array of messages, each of which is itself an array containing "type" and "message" fields.
+     * @return array<int, array{type: string, message: string, placeholders: mixed[]|int}> An array of messages, each of which is itself an array containing "type" and "message" fields.
      */
-    abstract public function messages(): array;
+    abstract protected function retrieveMessages(): array;
 
     /**
      * Clear all messages from this message stream.
@@ -147,7 +144,7 @@ abstract public function resetMessageStream(): void;
     /**
      * Save messages to the stream.
      *
-     * @param array<int, array{type: string, message: string}> $messages
+     * @param array{type: string, message: string, placeholders: mixed[]|int} $message
      */
-    abstract protected function saveMessages(array $messages): void;
+    abstract protected function storeMessage(array $message): void;
 }
diff --git a/src/Alert/CacheAlertStream.php b/src/Alert/CacheAlertStream.php
index 0a33d478..9381171d 100644
--- a/src/Alert/CacheAlertStream.php
+++ b/src/Alert/CacheAlertStream.php
@@ -24,35 +24,27 @@
  */
 class CacheAlertStream extends AlertStream
 {
-    /**
-     * @var Cache Object We use the cache object so that added messages will automatically appear in the cache.
-     */
-    protected Cache $cache;
-
-    /**
-     * @var string Session id tied to the alert stream.
-     */
-    protected string $session_id;
-
     /**
      * Create a new message stream.
      *
-     * @param string          $messagesKey Store the messages under this key
-     * @param Translator|null $translator
-     * @param Cache           $cache
-     * @param string          $sessionId
+     * @param string     $messagesKey Store the messages under this key
+     * @param Translator $translator
+     * @param Cache      $cache       Object We use the cache object so that added messages will automatically appear in the cache.
+     * @param string     $tag         Cache tag id tied to the alert stream. Usually tied to the session ID.
      */
-    public function __construct(string $messagesKey, ?Translator $translator, Cache $cache, string $sessionId)
-    {
-        $this->cache = $cache;
-        $this->session_id = $sessionId;
-        parent::__construct($messagesKey, $translator);
+    public function __construct(
+        protected string $messagesKey,
+        protected Translator $translator,
+        protected Cache $cache,
+        protected string $tag,
+    ) {
+        parent::__construct($translator);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function messages(): array
+    protected function retrieveMessages(): array
     {
         if ($this->getCache()->has($this->messagesKey)) {
             $data = $this->getCache()->get($this->messagesKey);
@@ -74,8 +66,11 @@ public function resetMessageStream(): void
     /**
      * {@inheritDoc}
      */
-    protected function saveMessages(array $messages): void
+    protected function storeMessage(array $message): void
     {
+        $messages = $this->retrieveMessages();
+        $messages[] = $message;
+
         $this->getCache()->forever($this->messagesKey, $messages);
     }
 
@@ -84,6 +79,6 @@ protected function saveMessages(array $messages): void
      */
     protected function getCache(): TaggedCache
     {
-        return $this->cache->tags('_s' . $this->session_id);
+        return $this->cache->tags('_s' . $this->tag);
     }
 }
diff --git a/src/Alert/SessionAlertStream.php b/src/Alert/SessionAlertStream.php
index 00975f55..5061061c 100644
--- a/src/Alert/SessionAlertStream.php
+++ b/src/Alert/SessionAlertStream.php
@@ -21,28 +21,25 @@
  */
 class SessionAlertStream extends AlertStream
 {
-    /**
-     * @var Session We use the session object so that added messages will automatically appear in the session.
-     */
-    protected Session $session;
-
     /**
      * Create a new message stream.
      *
-     * @param string          $messagesKey Store the messages under this key
-     * @param Translator|null $translator
-     * @param Session         $session
+     * @param string     $messagesKey Store the messages under this key
+     * @param Session    $session     We use the session object so that added messages will automatically appear in the session.
+     * @param Translator $translator
      */
-    public function __construct(string $messagesKey, ?Translator $translator, Session $session)
-    {
-        $this->session = $session;
-        parent::__construct($messagesKey, $translator);
+    public function __construct(
+        protected string $messagesKey,
+        protected Translator $translator,
+        protected Session $session,
+    ) {
+        parent::__construct($translator);
     }
 
     /**
      * {@inheritDoc}
      */
-    public function messages(): array
+    protected function retrieveMessages(): array
     {
         $data = $this->session->get($this->messagesKey);
 
@@ -60,8 +57,11 @@ public function resetMessageStream(): void
     /**
      * {@inheritDoc}
      */
-    protected function saveMessages(array $messages): void
+    protected function storeMessage(array $message): void
     {
+        $messages = $this->retrieveMessages();
+        $messages[] = $message;
+
         $this->session->set($this->messagesKey, $messages);
     }
 }
diff --git a/tests/Alert/CacheAlertStreamTest.php b/tests/Alert/CacheAlertStreamTest.php
index 47920268..85ebfa74 100644
--- a/tests/Alert/CacheAlertStreamTest.php
+++ b/tests/Alert/CacheAlertStreamTest.php
@@ -16,6 +16,7 @@
 use PHPUnit\Framework\TestCase;
 use UserFrosting\Alert\AlertStream;
 use UserFrosting\Alert\CacheAlertStream;
+use UserFrosting\Cache\ArrayStore;
 use UserFrosting\I18n\Translator;
 
 class CacheAlertStreamTest extends TestCase
@@ -23,36 +24,18 @@ class CacheAlertStreamTest extends TestCase
     use MockeryPHPUnitIntegration;
 
     protected string $key = 'alerts';
-
-    protected string $session_id = 'foo123';
+    protected string $tag = 'foo123';
 
     public function testConstructor(): void
     {
         $translator = m::mock(Translator::class);
         $cache = m::mock(Cache::class);
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
 
         $this->assertInstanceOf(AlertStream::class, $stream); // @phpstan-ignore-line
         $this->assertInstanceOf(CacheAlertStream::class, $stream); // @phpstan-ignore-line
     }
 
-    /**
-     * @depends testConstructor
-     */
-    public function testSetTranslator(): void
-    {
-        $translator = m::mock(Translator::class);
-        $cache = m::mock(Cache::class);
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
-
-        $this->assertSame($translator, $stream->translator());
-
-        $translator2 = m::mock(Translator::class);
-        $this->assertNotSame($translator, $translator2);
-        $this->assertInstanceOf(CacheAlertStream::class, $stream->setTranslator($translator2)); // @phpstan-ignore-line
-        $this->assertSame($translator2, $stream->translator());
-    }
-
     /**
      * @depends testConstructor
      */
@@ -65,15 +48,16 @@ public function testAddMessage(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $tags->shouldReceive('has')->with($this->key)->once()->andReturn(false);
         $tags->shouldReceive('forever')->with($this->key, [$message])->once()->andReturn(null);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $this->assertInstanceOf(CacheAlertStream::class, $stream->addMessage('success', 'foo')); // @phpstan-ignore-line
     }
 
@@ -89,16 +73,17 @@ public function testAddMessageWithExistingKey(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $tags->shouldReceive('has')->with($this->key)->once()->andReturn(true);
         $tags->shouldReceive('get')->with($this->key)->once()->andReturn(false);
         $tags->shouldReceive('forever')->with($this->key, [$message])->once()->andReturn(null);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $stream->addMessage('success', 'foo');
     }
 
@@ -114,16 +99,17 @@ public function testAddMessageWithExistingKeyNotEmpty(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $tags->shouldReceive('has')->with($this->key)->once()->andReturn(true);
         $tags->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
         $tags->shouldReceive('forever')->with($this->key, [$message, $message])->once()->andReturn(null);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $stream->addMessage('success', 'foo');
     }
 
@@ -139,25 +125,13 @@ public function testResetMessageStream(): void
 
         // Set expectations
         $tags->shouldReceive('forget')->with($this->key)->once()->andReturn(true);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $stream->resetMessageStream();
     }
 
-    /**
-     * @depends testConstructor
-     */
-    public function testAddMessageTranslatedWithNoTranslator(): void
-    {
-        $cache = m::mock(Cache::class);
-        $stream = new CacheAlertStream($this->key, null, $cache, $this->session_id);
-
-        $this->expectException(\RuntimeException::class);
-        $stream->addMessageTranslated('success', 'foo', []);
-    }
-
     /**
      * @depends testConstructor
      */
@@ -168,24 +142,29 @@ public function testAddMessageTranslated(): void
         $cache = m::mock(Cache::class);
         $tags = m::mock(\Illuminate\Cache\TaggedCache::class);
 
-        //
+        // Data
         $key = 'FOO';
         $placeholder = ['key' => 'value'];
         $result = 'Bar';
 
         // Set expectations
-        $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
         $message = [
-            'type'    => 'success',
-            'message' => $result,
+            'type'         => 'success',
+            'message'      => $key,
+            'placeholders' => $placeholder,
         ];
         $tags->shouldReceive('has')->with($this->key)->once()->andReturn(false);
+        $tags->shouldReceive('has')->with($this->key)->once()->andReturn(true);
+        $tags->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
         $tags->shouldReceive('forever')->with($this->key, [$message])->once()->andReturn(null);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
-        $stream->addMessageTranslated('success', $key, $placeholder);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
+        $stream->addMessageTranslated('success', $key, $placeholder); // @phpstan-ignore-line
+
+        $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
+        $this->assertSame($result, $stream->messages()[0]['message']);
     }
 
     /**
@@ -201,16 +180,18 @@ public function testGetAndClearMessages(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $tags->shouldReceive('forget')->with($this->key)->once()->andReturn(true);
         $tags->shouldReceive('has')->with($this->key)->once()->andReturn(true);
         $tags->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
+        $translator->shouldReceive('translate')->with('foo', [])->andReturn('foo');
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $this->assertSame([$message], $stream->getAndClearMessages());
     }
 
@@ -233,22 +214,57 @@ public function testAddValidationErrors(): void
         $validator->shouldReceive('errors')->once()->andReturn($data);
 
         $message1 = [
-            'type'    => 'danger',
-            'message' => 'Name is required',
+            'type'         => 'danger',
+            'message'      => 'Name is required',
+            'placeholders' => [],
         ];
         $message2 = [
-            'type'    => 'danger',
-            'message' => 'Email should be a valid email address',
+            'type'         => 'danger',
+            'message'      => 'Email should be a valid email address',
+            'placeholders' => [],
         ];
         $tags->shouldReceive('has')->with($this->key)->andReturn(false, true, true); // Save 1, Save 2, display both
         $tags->shouldReceive('get')->with($this->key)->andReturn([$message1], [$message1, $message2]); // Save 2, Display both
         $tags->shouldReceive('forever')->with($this->key, [$message1])->once()->andReturn(null); // Save 1
         $tags->shouldReceive('forever')->with($this->key, [$message1, $message2])->once()->andReturn(null); // Save 2
-        $cache->shouldReceive('tags')->with('_s' . $this->session_id)->andReturn($tags);
+        $cache->shouldReceive('tags')->with('_s' . $this->tag)->andReturn($tags);
+        $translator->shouldReceive('translate')->with($message1['message'], [])->andReturn($message1['message']);
+        $translator->shouldReceive('translate')->with($message2['message'], [])->andReturn($message2['message']);
 
         // Process
-        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->session_id);
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
         $stream->addValidationErrors($validator);
         $this->assertSame([$message1, $message2], $stream->messages());
     }
+
+    public function testRealCacheService(): void
+    {
+        // Data
+        $key = 'FOO';
+        $placeholder = ['key' => 'value'];
+        $result = 'Bar';
+        $expectedResult = [
+            'type'         => 'success',
+            'message'      => $result,
+            'placeholders' => $placeholder,
+        ];
+
+        // Setup dependencies
+        $cache = (new ArrayStore())->instance();
+
+        // Setup Translator
+        $translator = m::mock(Translator::class);
+        $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
+
+        $stream = new CacheAlertStream($this->key, $translator, $cache, $this->tag);
+        $this->assertEmpty($stream->messages());
+        $stream->addMessage('success', $key, $placeholder);
+        $this->assertCount(1, $stream->messages());
+        $this->assertSame([$expectedResult], $stream->messages());
+        $this->assertCount(1, $stream->messages());
+        $stream->addMessage('success', $key, $placeholder);
+        $this->assertCount(2, $stream->messages());
+        $this->assertSame([$expectedResult, $expectedResult], $stream->getAndClearMessages());
+        $this->assertCount(0, $stream->messages());
+    }
 }
diff --git a/tests/Alert/SessionAlertStreamTest.php b/tests/Alert/SessionAlertStreamTest.php
index e7a22d95..2f0ead39 100644
--- a/tests/Alert/SessionAlertStreamTest.php
+++ b/tests/Alert/SessionAlertStreamTest.php
@@ -10,6 +10,7 @@
 
 namespace UserFrosting\Tests\Alert;
 
+use Illuminate\Session\ArraySessionHandler;
 use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;
 use Mockery as m;
 use PHPUnit\Framework\TestCase;
@@ -23,7 +24,6 @@ class SessionAlertStreamTest extends TestCase
     use MockeryPHPUnitIntegration;
 
     protected string $key = 'alerts';
-
     protected string $session_id = 'foo123';
 
     public function testConstructor(): void
@@ -36,23 +36,6 @@ public function testConstructor(): void
         $this->assertInstanceOf(SessionAlertStream::class, $stream); // @phpstan-ignore-line
     }
 
-    /**
-     * @depends testConstructor
-     */
-    public function testSetTranslator(): void
-    {
-        $translator = m::mock(Translator::class);
-        $session = m::mock(Session::class);
-        $stream = new SessionAlertStream($this->key, $translator, $session);
-
-        $this->assertSame($translator, $stream->translator());
-
-        $translator2 = m::mock(Translator::class);
-        $this->assertNotSame($translator, $translator2);
-        $this->assertInstanceOf(SessionAlertStream::class, $stream->setTranslator($translator2)); // @phpstan-ignore-line
-        $this->assertSame($translator2, $stream->translator());
-    }
-
     /**
      * @depends testConstructor
      */
@@ -64,8 +47,9 @@ public function testAddMessage(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $session->shouldReceive('get')->with($this->key)->once()->andReturn(false);
         $session->shouldReceive('set')->with($this->key, [$message])->once()->andReturn(null);
@@ -86,8 +70,9 @@ public function testAddMessageWithExistingKeyNotEmpty(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $session->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
         $session->shouldReceive('set')->with($this->key, [$message, $message])->once()->andReturn(null);
@@ -114,18 +99,6 @@ public function testResetMessageStream(): void
         $stream->resetMessageStream();
     }
 
-    /**
-     * @depends testConstructor
-     */
-    public function testAddMessageTranslatedWithNoTranslator(): void
-    {
-        $session = m::mock(Session::class);
-        $stream = new SessionAlertStream($this->key, null, $session);
-
-        $this->expectException(\RuntimeException::class);
-        $stream->addMessageTranslated('success', 'foo', []);
-    }
-
     /**
      * @depends testConstructor
      */
@@ -135,7 +108,7 @@ public function testAddMessageTranslated(): void
         $translator = m::mock(Translator::class);
         $session = m::mock(Session::class);
 
-        //
+        // Data
         $key = 'FOO';
         $placeholder = ['key' => 'value'];
         $result = 'Bar';
@@ -143,15 +116,20 @@ public function testAddMessageTranslated(): void
         // Set expectations
         $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
         $message = [
-            'type'    => 'success',
-            'message' => $result,
+            'type'         => 'success',
+            'message'      => 'FOO',
+            'placeholders' => ['key' => 'value'],
         ];
         $session->shouldReceive('get')->with($this->key)->once()->andReturn(false);
         $session->shouldReceive('set')->with($this->key, [$message])->once()->andReturn(null);
+        $session->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
 
         // Process
         $stream = new SessionAlertStream($this->key, $translator, $session);
-        $stream->addMessageTranslated('success', $key, $placeholder);
+        $stream->addMessageTranslated('success', $key, $placeholder); // @phpstan-ignore-line
+
+        $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
+        $this->assertSame($result, $stream->messages()[0]['message']);
     }
 
     /**
@@ -165,11 +143,13 @@ public function testGetAndClearMessages(): void
 
         // Set expectations
         $message = [
-            'type'    => 'success',
-            'message' => 'foo',
+            'type'         => 'success',
+            'message'      => 'foo',
+            'placeholders' => [],
         ];
         $session->shouldReceive('get')->with($this->key)->once()->andReturn([$message]);
         $session->shouldReceive('set')->with($this->key, [])->once()->andReturn(true);
+        $translator->shouldReceive('translate')->with('foo', [])->andReturn('foo');
 
         // Process
         $stream = new SessionAlertStream($this->key, $translator, $session);
@@ -194,20 +174,58 @@ public function testAddValidationErrors(): void
         $validator->shouldReceive('errors')->once()->andReturn($data);
 
         $message1 = [
-            'type'    => 'danger',
-            'message' => 'Name is required',
+            'type'         => 'danger',
+            'message'      => 'Name is required',
+            'placeholders' => [],
         ];
         $message2 = [
-            'type'    => 'danger',
-            'message' => 'Email should be a valid email address',
+            'type'         => 'danger',
+            'message'      => 'Email should be a valid email address',
+            'placeholders' => [],
         ];
         $session->shouldReceive('get')->with($this->key)->andReturn(false, [$message1], [$message1, $message2]); // Save 1, Save 2, Display both
         $session->shouldReceive('set')->with($this->key, [$message1])->andReturn(null); // Save 1
         $session->shouldReceive('set')->with($this->key, [$message1, $message2])->andReturn(null); // Save 2
+        $translator->shouldReceive('translate')->with($message1['message'], [])->andReturn($message1['message']);
+        $translator->shouldReceive('translate')->with($message2['message'], [])->andReturn($message2['message']);
 
         // Process
         $stream = new SessionAlertStream($this->key, $translator, $session);
         $stream->addValidationErrors($validator);
         $this->assertSame([$message1, $message2], $stream->messages());
     }
+
+    public function testRealSessionService(): void
+    {
+        // Data
+        $key = 'FOO';
+        $placeholder = ['key' => 'value'];
+        $result = 'Bar';
+        $expectedResult = [
+            'type'         => 'success',
+            'message'      => $result,
+            'placeholders' => $placeholder,
+        ];
+
+        // Setup dependencies
+        $handler = new ArraySessionHandler(60);
+        $session = new Session($handler);
+        $session->destroy();
+        $session->start();
+
+        // Setup Translator
+        $translator = m::mock(Translator::class);
+        $translator->shouldReceive('translate')->with($key, $placeholder)->andReturn($result);
+
+        $stream = new SessionAlertStream($this->key, $translator, $session);
+        $this->assertEmpty($stream->messages());
+        $stream->addMessage('success', $key, $placeholder);
+        $this->assertCount(1, $stream->messages());
+        $this->assertSame([$expectedResult], $stream->messages());
+        $this->assertCount(1, $stream->messages());
+        $stream->addMessage('success', $key, $placeholder);
+        $this->assertCount(2, $stream->messages());
+        $this->assertSame([$expectedResult, $expectedResult], $stream->getAndClearMessages());
+        $this->assertCount(0, $stream->messages());
+    }
 }