diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 1a4f188..85e486e 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -11,6 +11,9 @@
             -->
             <directory>tests/Integration/Client</directory>
         </testsuite>
+        <testsuite name="unit">
+            <directory>tests/Unit/Client</directory>
+        </testsuite>
     </testsuites>
     <source>
         <include>
diff --git a/tests/Unit/Client/Fixtures/get_notification_response.json b/tests/Unit/Client/Fixtures/get_notification_response.json
new file mode 100644
index 0000000..c3b36b3
--- /dev/null
+++ b/tests/Unit/Client/Fixtures/get_notification_response.json
@@ -0,0 +1,19 @@
+{
+  "id": "UUVVWWXX",
+  "user_id": "Dc7EYhxG",
+  "type": "project_update",
+  "title": "**My Project** has been updated!",
+  "text": "The project, My Project, has released a new version: 1.0.0",
+  "link": "mod/AABBCCDD/version/IIJJKKLL",
+  "read": false,
+  "created": "string",
+  "actions": [
+    {
+      "title": "Accept",
+      "action_route": [
+        "POST",
+        "team/{id}/join"
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/tests/Unit/Client/Fixtures/get_project_response.json b/tests/Unit/Client/Fixtures/get_project_response.json
new file mode 100644
index 0000000..1037d87
--- /dev/null
+++ b/tests/Unit/Client/Fixtures/get_project_response.json
@@ -0,0 +1,244 @@
+{
+  "id": "mOgUt4GM",
+  "slug": "modmenu",
+  "project_type": "mod",
+  "team": "VMz4FpgB",
+  "title": "Mod Menu",
+  "description": "Adds a mod menu to view the list of mods you have installed.",
+  "body": "![Mod Menu Banner](https://i.imgur.com/dMYWAjn.png)\nHard to be more descriptive than that. It enriches the standard Minecraft menu with an interface displaying a one-dimensional array of modifications\n\n\n\nMod Menu requires [Fabric Loader](https://fabricmc.net/use/) and [Fabric API](https://www.modrinth.com/mod/fabric-api)\n\nCheck out the [Terraformers Discord Server](https://discord.gg/jEGF5fb) to chat about Mod Menu and other Fabric mods!\n\nA picture's worth 2 words\n\n![Mod Menu Screenshot](https://i.imgur.com/wp83YOP.png)\n\n\n### Mod Menu is a mod for Fabric, and there are no plans to port this mod to Forge.",
+  "body_url": null,
+  "published": "2020-11-06T05:11:04.725058Z",
+  "updated": "2023-07-18T20:52:37.015257Z",
+  "approved": "2020-11-06T05:11:04.725058Z",
+  "queued": null,
+  "status": "approved",
+  "requested_status": null,
+  "moderator_message": null,
+  "license": {
+    "id": "MIT",
+    "name": "MIT License",
+    "url": null
+  },
+  "client_side": "required",
+  "server_side": "unsupported",
+  "downloads": 1697771,
+  "followers": 5359,
+  "categories": [
+    "utility"
+  ],
+  "additional_categories": [],
+  "game_versions": [
+    "1.14.4",
+    "1.15.2",
+    "1.16.1",
+    "1.16.4",
+    "1.16.5",
+    "1.17",
+    "1.17.1",
+    "1.17-pre1",
+    "1.18",
+    "1.18.1",
+    "1.18.1-pre1",
+    "1.18.1-rc1",
+    "1.18.1-rc2",
+    "1.18.1-rc3",
+    "1.18.2",
+    "1.18.2-pre1",
+    "1.18.2-pre2",
+    "1.18.2-pre3",
+    "1.18.2-rc1",
+    "1.19",
+    "1.19.1",
+    "1.19.1-pre2",
+    "1.19.1-rc1",
+    "1.19.2",
+    "1.19.3",
+    "1.19.4",
+    "1.19.4-pre1",
+    "1.19.4-pre2",
+    "1.19.4-pre3",
+    "1.19.4-pre4",
+    "1.19.4-rc1",
+    "1.19.4-rc2",
+    "1.19.4-rc3",
+    "1.19-pre1",
+    "1.19-pre2",
+    "1.19-pre3",
+    "1.19-pre4",
+    "1.20",
+    "1.20.1",
+    "1.20.1-rc1",
+    "1.20-pre1",
+    "1.20-pre2",
+    "1.20-pre3",
+    "1.20-pre4",
+    "1.20-pre5",
+    "1.20-pre6",
+    "1.20-pre7",
+    "1.20-rc1",
+    "21w06a",
+    "21w14a",
+    "21w37a",
+    "21w38a",
+    "22w03a",
+    "22w05a",
+    "22w06a",
+    "22w07a",
+    "22w15a",
+    "22w16b",
+    "22w17a",
+    "22w18a",
+    "22w19a",
+    "22w24a",
+    "22w43a",
+    "23w03a",
+    "23w05a",
+    "23w07a",
+    "23w12a",
+    "23w13a",
+    "23w13a_or_b",
+    "23w14a",
+    "23w16a",
+    "23w17a",
+    "23w18a"
+  ],
+  "loaders": [
+    "fabric",
+    "quilt"
+  ],
+  "versions": [
+    "M3KFXLhq",
+    "DgzrfgAZ",
+    "O90fUm3q",
+    "zC13OZD9",
+    "7QWIhei3",
+    "79rtoAM6",
+    "kBofQyu4",
+    "TleLdS1A",
+    "PqgXyy3N",
+    "Mnl0OeFI",
+    "pxj9L3Vy",
+    "6YvLIUDN",
+    "wb5nbuL5",
+    "bPE0GIoY",
+    "pqlMITZQ",
+    "RIf7gcLA",
+    "Gz5wa6j2",
+    "EDbIonje",
+    "wRE7Emzz",
+    "mzVbb1XI",
+    "bHODZExo",
+    "a8bewBQT",
+    "NyFB1gry",
+    "oQr5VO7q",
+    "u955lyFM",
+    "E4QBMVtO",
+    "c6uDXZX8",
+    "bojzkt4w",
+    "4Ar2wg0k",
+    "G8sCBZ1X",
+    "JyL5b75a",
+    "GOPQZTVp",
+    "Wr4GfZdy",
+    "tlM0eBmY",
+    "DOitjZ89",
+    "XtL1i60M",
+    "VaZTuVan",
+    "FMqdptUn",
+    "aH8qgnVM",
+    "9xECQHnM",
+    "LVxVja5i",
+    "JOqf8AZn",
+    "WKj0jgYj",
+    "jZQ0G78K",
+    "PN4NcBa1",
+    "WkUCkcQA",
+    "3CD6YUw1",
+    "JPP6w2U1",
+    "eueI9czw",
+    "4JrWqhWw",
+    "Ui2loaCY",
+    "fw5MM4c4",
+    "6f25OJ7w",
+    "E4VKK6kQ",
+    "y8cYdaYa",
+    "GYRoFp1I",
+    "Tk7mCRX1",
+    "aShj7736",
+    "dP3zrFbp",
+    "cx9D94fU",
+    "pnFEFiHq",
+    "ybXxCvz4",
+    "NsD1IoUs",
+    "oU5qfeR6",
+    "2Ys0a7JE",
+    "8TOgNwQL",
+    "kQDE01D3",
+    "3umfHb6R",
+    "Gbkn1raO",
+    "d86kV6wd",
+    "NAs8eiQa",
+    "RxrqnH1z",
+    "GI1HTA1O",
+    "sI3kiPZE",
+    "4dReZoTJ",
+    "7mdkE3Od",
+    "qDXCbEz4",
+    "IPLgxPn7",
+    "V4hnfgRO",
+    "nVxObSbX",
+    "7kh2ofyR",
+    "eIrlBn1Z",
+    "yA8g3pEj",
+    "oqeCO757",
+    "4LXaG2xg",
+    "5qqTBb38",
+    "7E8dbVv0",
+    "5aw4r6fS",
+    "pyDmgV07",
+    "jRqFAHRH",
+    "4EOA40rU",
+    "gSoPJyVn",
+    "RtaGQNyd",
+    "sXVmzBDB",
+    "U31K6311",
+    "JYTmttex",
+    "pged5sGx",
+    "5e62j63G",
+    "nM5QaZNo",
+    "aMxXwo9x",
+    "3gwnUSKz",
+    "yjjsLqbS",
+    "RdCGzY7B",
+    "EuNUYds8",
+    "iZRiOnnj",
+    "M7LIgtWJ",
+    "RTFDnTKf",
+    "CtMNOUcV",
+    "zv46i3PW",
+    "VHzvWfY2",
+    "sLzitH81",
+    "id0aLmxO",
+    "eTCL1uh8",
+    "lMqXEzUw"
+  ],
+  "icon_url": "https://cdn.modrinth.com/data/mOgUt4GM/icon.png",
+  "issues_url": "https://github.com/TerraformersMC/ModMenu/issues",
+  "source_url": "https://github.com/TerraformersMC/ModMenu",
+  "wiki_url": "https://github.com/TerraformersMC/ModMenu/wiki",
+  "discord_url": "https://discord.gg/jEGF5fb",
+  "donation_urls": [],
+  "gallery": [
+    {
+      "url": "https://cdn.modrinth.com/data/mOgUt4GM/images/5726bbaf7d0ea53e55b6e666af5d3e1861758334.png",
+      "featured": false,
+      "title": "Mod Menu",
+      "description": null,
+      "created": "2022-02-28T02:33:37.984225Z",
+      "ordering": 0
+    }
+  ],
+  "color": 1330428,
+  "thread_id": "mOgUt4GM",
+  "monetization_status": "monetized"
+}
\ No newline at end of file
diff --git a/tests/Unit/Client/Fixtures/get_user_response.json b/tests/Unit/Client/Fixtures/get_user_response.json
new file mode 100644
index 0000000..d1cb7e8
--- /dev/null
+++ b/tests/Unit/Client/Fixtures/get_user_response.json
@@ -0,0 +1,17 @@
+{
+  "id": "Dc7EYhxG",
+  "username": "Prospector",
+  "name": null,
+  "avatar_url": "https://cdn.modrinth.com/user/Dc7EYhxG/64d0b4c4cdcb33f3b7d4b31b140e83b199b00f3c.png",
+  "bio": "Lead Frontend Developer/Designer and Archivist at Modrinth. Founder of ModFest, co-founder of TerraformersMC. Creator of Traverse and Mod Menu.",
+  "created": "2020-11-06T04:56:05.014379Z",
+  "role": "admin",
+  "badges": 0,
+  "payout_data": null,
+  "auth_providers": null,
+  "email": null,
+  "email_verified": null,
+  "has_password": null,
+  "has_totp": null,
+  "github_id": null
+}
\ No newline at end of file
diff --git a/tests/Unit/Client/Models/NotificationTest.php b/tests/Unit/Client/Models/NotificationTest.php
new file mode 100644
index 0000000..8763933
--- /dev/null
+++ b/tests/Unit/Client/Models/NotificationTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Aternos\ModrinthApi\Tests\Unit\Client\Models;
+
+use Aternos\ModrinthApi\Client\ModrinthAPIClient;
+use Aternos\ModrinthApi\Client\Notification;
+use GuzzleHttp\Client;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Psr7\Response;
+use PHPUnit\Framework\TestCase;
+
+class NotificationTest extends TestCase
+{
+
+    public function testGetDataReturnsCorrectNotificationModel(): void
+    {
+        $notificationModel = $this->getExampleNotificationModel();
+        $notification = new Notification(new ModrinthAPIClient(), $notificationModel);
+        $this->assertEquals($notificationModel, $notification->getData());
+    }
+
+    public function testGetUserReturnsCorrectUser(): void
+    {
+        // Here we must mock the client, because it requests the user from the API to get all details
+        $handler = new MockHandler([
+            new Response(200, [], file_get_contents(__DIR__ . "/../Fixtures/get_user_response.json")),
+            new Response(200, [], file_get_contents(__DIR__ . "/../Fixtures/get_user_response.json"))
+        ]);
+        $client = new ModrinthAPIClient(null, null, new Client(['handler' => HandlerStack::create($handler)]));
+
+        $notification = new Notification($client, $this->getExampleNotificationModel());
+        // Dc7EYhxG -> https://modrinth.com/user/Prospector
+        $user = $client->getUser("Dc7EYhxG");
+        $this->assertEquals($user, $notification->getUser());
+    }
+
+    protected function getExampleNotificationModel(): \Aternos\ModrinthApi\Model\Notification
+    {
+        $json = json_decode(file_get_contents(__DIR__ . "/../Fixtures/get_notification_response.json"), true);
+        return new \Aternos\ModrinthApi\Model\Notification($json);
+    }
+}
\ No newline at end of file
diff --git a/tests/Unit/Client/Models/ProjectTest.php b/tests/Unit/Client/Models/ProjectTest.php
new file mode 100644
index 0000000..22990fe
--- /dev/null
+++ b/tests/Unit/Client/Models/ProjectTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Aternos\ModrinthApi\Tests\Unit\Client\Models;
+
+use Aternos\ModrinthApi\Client\ModrinthAPIClient;
+use Aternos\ModrinthApi\Client\Project;
+use PHPUnit\Framework\TestCase;
+
+class ProjectTest extends TestCase
+{
+
+    public function testGetDataReturnsCorrectProjectModel(): void
+    {
+        $projectModel = $this->getExampleProjectModel();
+        $project = new Project(new ModrinthAPIClient(), $projectModel);
+        $this->assertEquals($projectModel, $project->getData());
+    }
+
+    protected function getExampleProjectModel(): \Aternos\ModrinthApi\Model\Project
+    {
+        $json = json_decode(file_get_contents(__DIR__ . "/../Fixtures/get_project_response.json"), true);
+        return new \Aternos\ModrinthApi\Model\Project($json);
+    }
+}
\ No newline at end of file