diff --git a/src/Models/Conversation.php b/src/Models/Conversation.php
index e2774db..f198e0f 100644
--- a/src/Models/Conversation.php
+++ b/src/Models/Conversation.php
@@ -47,4 +47,17 @@ public static function createManyFromArray(array $data): array
         }
         return $conversations;
     }
+
+    public function unreadBy(): ?array
+    {
+        if ($this->lastMessage === null) {
+            return null;
+        }
+
+        $readBy = $this->lastMessage->readBy;
+        $readBy[] = $this->lastMessage->senderId;
+        $participants = array_keys($this->participants);
+
+        return array_diff($participants, $readBy);
+    }
 }
diff --git a/src/Models/Message.php b/src/Models/Message.php
index df327b2..2d5c372 100644
--- a/src/Models/Message.php
+++ b/src/Models/Message.php
@@ -53,4 +53,20 @@ public function isSystemMessage(): bool
     {
         return $this->type == MessageType::SYSTEM;
     }
+
+    public function isReadBy(string $userId): bool
+    {
+        if ($userId === $this->senderId) {
+            return true;
+        }
+
+        return in_array($userId, $this->readBy, true);
+    }
+
+    public function isRead(): bool
+    {
+        $unread = array_diff($this->readBy, [$this->senderId]);
+
+        return !empty($unread);
+    }
 }
diff --git a/tests/Feature/ConversationTest.php b/tests/Feature/ConversationTest.php
index c845756..bb3df7f 100644
--- a/tests/Feature/ConversationTest.php
+++ b/tests/Feature/ConversationTest.php
@@ -14,12 +14,12 @@
 use CarAndClassic\TalkJS\Events\ParticipationUpdated;
 use CarAndClassic\TalkJS\Models\Conversation;
 use CarAndClassic\TalkJS\Models\Message;
+use CarAndClassic\TalkJS\Tests\TestCase;
 use Symfony\Component\HttpClient\Response\MockResponse;
 
 final class ConversationTest extends TestCase
 {
     private array $userIds;
-
     private array $conversations;
 
     public function setUp(): void
@@ -54,7 +54,7 @@ public function setUp(): void
                     'createdAt' => $createdAt,
                 ]),
                 'participants' => [
-                     $this->userIds[0] => [
+                    $this->userIds[0] => [
                         'access' => 'ReadWrite',
                         'notify' => true
                     ],
@@ -84,6 +84,38 @@ public function setUp(): void
                     ]
                 ],
                 'createdAt' => $createdAt
+            ],
+            [
+                'id' => 'testConversationId3',
+                'subject' => 'Test Conversation 3',
+                'topicId' => 'Test Topic 3',
+                'photoUrl' => null,
+                'welcomeMessages' => ['Test Welcome Message'],
+                'custom' => ['test' => 'test'],
+                'lastMessage' => new Message([
+                    'id' => "test",
+                    'type' => "UserMessage",
+                    'conversationId' => "dev_test",
+                    'senderId' => $this->userIds[1],
+                    'text' => "This is the message copy",
+                    'readBy' => [],
+                    'origin' => "rest",
+                    'location' => null,
+                    'custom' => [],
+                    'attachment' => null,
+                    'createdAt' => $createdAt,
+                ]),
+                'participants' => [
+                    $this->userIds[0] => [
+                        'access' => 'ReadWrite',
+                        'notify' => true
+                    ],
+                    $this->userIds[1] => [
+                        'access' => 'Read',
+                        'notify' => false
+                    ]
+                ],
+                'createdAt' => $createdAt
             ]
         ];
     }
diff --git a/tests/Feature/MessageTest.php b/tests/Feature/MessageTest.php
index 60eacea..06d604b 100644
--- a/tests/Feature/MessageTest.php
+++ b/tests/Feature/MessageTest.php
@@ -10,14 +10,13 @@
 use CarAndClassic\TalkJS\Events\MessageDeleted;
 use CarAndClassic\TalkJS\Events\MessageEdited;
 use CarAndClassic\TalkJS\Models\Message;
+use CarAndClassic\TalkJS\Tests\TestCase;
 use Symfony\Component\HttpClient\Response\MockResponse;
 
 final class MessageTest extends TestCase
 {
     private string $conversationId;
-
     private string $senderId;
-
     private array $messages;
 
     protected function setUp(): void
diff --git a/tests/Feature/UserTest.php b/tests/Feature/UserTest.php
index db14918..8525083 100644
--- a/tests/Feature/UserTest.php
+++ b/tests/Feature/UserTest.php
@@ -8,14 +8,13 @@
 use CarAndClassic\TalkJS\Events\UserCreatedOrUpdated;
 use CarAndClassic\TalkJS\Models\Conversation;
 use CarAndClassic\TalkJS\Models\User;
+use CarAndClassic\TalkJS\Tests\TestCase;
 use Symfony\Component\HttpClient\Response\MockResponse;
 
 final class UserTest extends TestCase
 {
     private string $userId;
-
     private array $userDetails;
-
     private array $userConversations;
 
     protected function setUp(): void
diff --git a/tests/Feature/TestCase.php b/tests/TestCase.php
similarity index 96%
rename from tests/Feature/TestCase.php
rename to tests/TestCase.php
index 998bcb7..01de248 100644
--- a/tests/Feature/TestCase.php
+++ b/tests/TestCase.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace CarAndClassic\TalkJS\Tests\Feature;
+namespace CarAndClassic\TalkJS\Tests;
 
 use CarAndClassic\TalkJS\Api\TalkJSApi;
 use PHPUnit\Framework\TestCase as BaseTestCase;
@@ -12,7 +12,6 @@
 abstract class TestCase extends BaseTestCase
 {
     protected array $defaultMockResponseHeaders;
-
     protected array $defaultFilters;
 
     protected function setUp(): void
diff --git a/tests/Unit/ConversationTest.php b/tests/Unit/ConversationTest.php
new file mode 100644
index 0000000..7835d6a
--- /dev/null
+++ b/tests/Unit/ConversationTest.php
@@ -0,0 +1,133 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CarAndClassic\TalkJS\Tests\Unit;
+
+use CarAndClassic\TalkJS\Models\Conversation;
+use CarAndClassic\TalkJS\Tests\TestCase;
+
+final class ConversationTest extends TestCase
+{
+    private array $conversations;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+        $createdAt = time() * 1000;
+        $userIds = [
+            'TestConversationUserId1',
+            'TestConversationUserId2'
+        ];
+        $this->conversations = [
+            [
+                'id' => 'testConversationId1',
+                'subject' => 'Test Conversation 1',
+                'topicId' => 'Test Topic 1',
+                'photoUrl' => null,
+                'welcomeMessages' => ['Test Welcome Message'],
+                'custom' => ['test' => 'test'],
+                'lastMessage' => [
+                    'id' => "test",
+                    'type' => "UserMessage",
+                    'conversationId' => "dev_test",
+                    'senderId' => $userIds[1],
+                    'text' => "This is the message copy",
+                    'readBy' => [
+                        $userIds[0],
+                    ],
+                    'origin' => "rest",
+                    'location' => null,
+                    'custom' => [],
+                    'attachment' => null,
+                    'createdAt' => $createdAt,
+                ],
+                'participants' => [
+                    $userIds[0] => [
+                        'access' => 'ReadWrite',
+                        'notify' => true
+                    ],
+                    $userIds[1] => [
+                        'access' => 'Read',
+                        'notify' => false
+                    ]
+                ],
+                'createdAt' => $createdAt
+            ],
+            [
+                'id' => 'testConversationId2',
+                'subject' => 'Test Conversation 2',
+                'topicId' => 'Test Topic 2',
+                'photoUrl' => null,
+                'welcomeMessages' => ['Test Welcome Message'],
+                'custom' => ['test' => 'test'],
+                'lastMessage' => null,
+                'participants' => [
+                    $userIds[0] => [
+                        'access' => 'ReadWrite',
+                        'notify' => true
+                    ],
+                    $userIds[1] => [
+                        'access' => 'Read',
+                        'notify' => false
+                    ]
+                ],
+                'createdAt' => $createdAt
+            ],
+            [
+                'id' => 'testConversationId3',
+                'subject' => 'Test Conversation 3',
+                'topicId' => 'Test Topic 3',
+                'photoUrl' => null,
+                'welcomeMessages' => ['Test Welcome Message'],
+                'custom' => ['test' => 'test'],
+                'lastMessage' => [
+                    'id' => "test",
+                    'type' => "UserMessage",
+                    'conversationId' => "dev_test",
+                    'senderId' => $userIds[1],
+                    'text' => "This is the message copy",
+                    'readBy' => [],
+                    'origin' => "rest",
+                    'location' => null,
+                    'custom' => [],
+                    'attachment' => null,
+                    'createdAt' => $createdAt,
+                ],
+                'participants' => [
+                    $userIds[0] => [
+                        'access' => 'ReadWrite',
+                        'notify' => true
+                    ],
+                    $userIds[1] => [
+                        'access' => 'Read',
+                        'notify' => false
+                    ]
+                ],
+                'createdAt' => $createdAt
+            ]
+        ];
+    }
+
+    public function testCreateManyFromArray(): void
+    {
+        $conversations = Conversation::createManyFromArray($this->conversations);
+
+        $this->assertIsArray($conversations);
+
+        foreach ($conversations as $conversation) {
+            $this->assertInstanceOf(Conversation::class, $conversation);
+        }
+    }
+
+    public function testUnreadBy(): void
+    {
+        $conversation1 = new Conversation($this->conversations[0]);
+        $conversation2 = new Conversation($this->conversations[1]);
+        $conversation3 = new Conversation($this->conversations[2]);
+
+        $this->assertEmpty($conversation1->unreadBy());
+        $this->assertNull($conversation2->unreadBy());
+        $this->assertEquals($conversation3->unreadBy(), ['TestConversationUserId1']);
+    }
+}
diff --git a/tests/Unit/MessageTest.php b/tests/Unit/MessageTest.php
new file mode 100644
index 0000000..a40253c
--- /dev/null
+++ b/tests/Unit/MessageTest.php
@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CarAndClassic\TalkJS\Tests\Unit;
+
+use CarAndClassic\TalkJS\Enumerations\MessageType;
+use CarAndClassic\TalkJS\Models\Message;
+use CarAndClassic\TalkJS\Tests\TestCase;
+
+final class MessageTest extends TestCase
+{
+    private string $senderId;
+    private array $messages;
+    private Message $message1;
+    private Message $message2;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $conversationId = 'testConversationId';
+        $this->senderId = 'testSenderId';
+        $this->userIds = [
+            'TestConversationUserId1',
+            'TestConversationUserId2'
+        ];
+        $this->messages = [
+            [
+                'id' => '1', // At time of writing results are returned descending
+                'type' => MessageType::USER,
+                'conversationId' => $conversationId,
+                'senderId' => $this->senderId,
+                'text' => 'Test User Message',
+                'readBy' => [
+                    $this->userIds[0]
+                ],
+                'origin' => 'rest',
+                'location' => null,
+                'custom' => ['test' => 'test'],
+                'createdAt' => (time() + 1) * 1000, // At time of writing TalkJS returns timestamp in milliseconds
+                'attachment' => null
+            ],
+            [
+                'id' => '2',
+                'type' => MessageType::SYSTEM,
+                'conversationId' => $conversationId,
+                'senderId' => null,
+                'text' => 'Test System Message',
+                'readBy' => [],
+                'origin' => 'rest',
+                'location' => null,
+                'custom' => ['test' => 'test'],
+                'createdAt' => time() * 1000,
+                'attachment' => null
+            ]
+        ];
+        $this->message1 = new Message($this->messages[0]);
+        $this->message2 = new Message($this->messages[1]);
+    }
+
+    public function testCreateManyFromArray(): void
+    {
+        $messages = Message::createManyFromArray($this->messages);
+
+        $this->assertIsArray($messages);
+
+        foreach ($messages as $message) {
+            $this->assertInstanceOf(Message::class, $message);
+        }
+    }
+
+    public function testIsUserMessage(): void
+    {
+        $this->assertSame($this->message1->isUserMessage(), true);
+        $this->assertSame($this->message2->isUserMessage(), false);
+    }
+
+    public function testIsSystemMessage(): void
+    {
+        $this->assertSame($this->message1->isSystemMessage(), false);
+        $this->assertSame($this->message2->isSystemMessage(), true);
+    }
+
+    public function testIsReadBy(): void
+    {
+        $this->assertSame($this->message1->isReadBy($this->userIds[0]), true);
+        $this->assertSame($this->message1->isReadBy($this->userIds[1]), false);
+        $this->assertSame($this->message1->isReadBy($this->senderId), true);
+        $this->assertSame($this->message2->isReadBy($this->userIds[0]), false);
+    }
+
+    public function testIsRead(): void
+    {
+        $this->assertSame($this->message1->isRead(), true);
+        $this->assertSame($this->message2->isRead(), false);
+    }
+}