diff --git a/db/migrations/2018_10_01_000000_create_users_tables.php b/db/migrations/2018_10_01_000000_create_users_tables.php
new file mode 100644
index 00000000..896ec7a4
--- /dev/null
+++ b/db/migrations/2018_10_01_000000_create_users_tables.php
@@ -0,0 +1,289 @@
+<?php
+
+namespace Engelsystem\Migrations;
+
+use Carbon\Carbon;
+use Engelsystem\Database\Migration\Migration;
+use Engelsystem\Models\User\Contact;
+use Engelsystem\Models\User\PasswordReset;
+use Engelsystem\Models\User\PersonalData;
+use Engelsystem\Models\User\Settings;
+use Engelsystem\Models\User\State;
+use Engelsystem\Models\User\User;
+use Illuminate\Database\Schema\Blueprint;
+use stdClass;
+
+class CreateUsersTables extends Migration
+{
+    use ChangesReferences;
+
+    /**
+     * Run the migration
+     */
+    public function up()
+    {
+        $this->schema->create('users', function (Blueprint $table) {
+            $table->increments('id');
+
+            $table->string('name', 24)->unique();
+            $table->string('email', 254)->unique();
+            $table->string('password', 128);
+            $table->string('api_key', 32);
+
+            $table->dateTime('last_login_at')->nullable();
+            $table->timestamps();
+        });
+
+        $this->schema->create('users_personal_data', function (Blueprint $table) {
+            $this->referencesUser($table);
+
+            $table->string('first_name', 64)->nullable();
+            $table->string('last_name', 64)->nullable();
+            $table->string('shirt_size', 4)->nullable();
+
+            $table->date('planned_arrival_date')->nullable();
+            $table->dateTime('arrival_date')->nullable();
+            $table->date('planned_departure_date')->nullable();
+        });
+
+        $this->schema->create('users_contact', function (Blueprint $table) {
+            $this->referencesUser($table);
+
+            $table->string('dect', 5)->nullable();
+            $table->string('mobile', 40)->nullable();
+            $table->string('email', 254)->nullable();
+        });
+
+        $this->schema->create('users_settings', function (Blueprint $table) {
+            $this->referencesUser($table);
+
+            $table->string('language', 64);
+            $table->tinyInteger('theme');
+            $table->boolean('email_human')->default(false);
+            $table->boolean('email_shiftinfo')->default(false);
+        });
+
+        $this->schema->create('users_state', function (Blueprint $table) {
+            $this->referencesUser($table);
+
+            $table->boolean('arrived')->default(false);
+            $table->boolean('active')->default(false);
+            $table->boolean('force_active')->default(false);
+            $table->boolean('got_shirt')->default(false);
+            $table->integer('got_voucher')->default(0);
+        });
+
+        $this->schema->create('password_resets', function (Blueprint $table) {
+            $this->referencesUser($table);
+
+            $table->text('token');
+
+            $table->timestamp('created_at')->nullable();
+        });
+
+        if ($this->schema->hasTable('User')) {
+            /** @var stdClass[] $users */
+            $users = $this->schema->getConnection()->table('User')->get();
+            foreach ($users as $data) {
+                $user = new User([
+                    'name'          => $data->Nick,
+                    'password'      => $data->Passwort,
+                    'email'         => $data->email,
+                    'api_key'       => $data->api_key,
+                    'last_login_at' => Carbon::createFromTimestamp($data->lastLogIn),
+                ]);
+                $user->setAttribute('id', $data->UID);
+                if (!in_array(
+                    $data->CreateDate,
+                    ['0000-00-00 00:00:00', '0001-01-01 00:00:00', '1000-01-01 00:00:00']
+                )) {
+                    $user->setAttribute('created_at', new Carbon($data->CreateDate));
+                }
+                $user->save();
+
+                $contact = new Contact([
+                    'dect'   => ($data->DECT && $data->DECT != '-') ? $data->DECT : null,
+                    'mobile' => $data->Handy ?: ($data->Telefon ?: null),
+                ]);
+                $contact->user()
+                    ->associate($user)
+                    ->save();
+
+                $personalData = new PersonalData([
+                    'first_name'             => $data->Vorname ?: null,
+                    'last_name'              => $data->Name ?: null,
+                    'shirt_size'             => $data->Size ?: null,
+                    'planned_arrival_date'   => $data->planned_arrival_date ? Carbon::createFromTimestamp($data->planned_arrival_date) : null,
+                    'arrival_date'           => $data->arrival_date ? Carbon::createFromTimestamp($data->arrival_date) : null,
+                    'planned_departure_date' => $data->planned_departure_date ? Carbon::createFromTimestamp($data->planned_departure_date) : null,
+                ]);
+                $personalData->user()
+                    ->associate($user)
+                    ->save();
+
+                $settings = new Settings([
+                    'language'        => $data->Sprache,
+                    'theme'           => $data->color,
+                    'email_human'     => $data->email_by_human_allowed,
+                    'email_shiftinfo' => $data->email_shiftinfo,
+                ]);
+                $settings->user()
+                    ->associate($user)
+                    ->save();
+
+                $state = new State([
+                    'arrived'      => $data->Gekommen,
+                    'active'       => $data->Aktiv,
+                    'force_active' => $data->force_active,
+                    'got_shirt'    => $data->Tshirt,
+                    'got_voucher'  => $data->got_voucher,
+                ]);
+                $state->user()
+                    ->associate($user)
+                    ->save();
+
+                if ($data->password_recovery_token) {
+                    $passwordReset = new PasswordReset([
+                        'token' => $data->password_recovery_token,
+                    ]);
+                    $passwordReset->user()
+                        ->associate($user)
+                        ->save();
+                }
+            }
+
+            $this->changeReferences(
+                'User',
+                'UID',
+                'users',
+                'id',
+                'unsignedInteger'
+            );
+        }
+
+        $this->schema->dropIfExists('User');
+    }
+
+    /**
+     * Reverse the migration
+     */
+    public function down()
+    {
+        $this->schema->create('User', function (Blueprint $table) {
+            $table->increments('UID');
+
+            $table->string('Nick', 23)->unique()->default('');
+            $table->string('Name', 23)->nullable();
+            $table->string('Vorname', 23)->nullable();
+            $table->tinyInteger('Alter')->nullable();
+            $table->string('Telefon', 40)->nullable();
+            $table->string('DECT', 5)->nullable();
+            $table->string('Handy', 40)->nullable();
+            $table->string('email', 123)->nullable();
+            $table->boolean('email_shiftinfo')->default(false)->comment('User wants to be informed by mail about changes in his shifts');
+            $table->string('jabber', 200)->nullable();
+            $table->string('Size', 4)->nullable();
+            $table->string('Passwort', 128)->nullable();
+            $table->string('password_recovery_token', 32)->nullable();
+            $table->tinyInteger('Gekommen')->default(false);
+            $table->tinyInteger('Aktiv')->default(false);
+            $table->boolean('force_active');
+            $table->tinyInteger('Tshirt')->default(false)->nullable();
+            $table->tinyInteger('color')->default(10)->nullable();
+            $table->char('Sprache', 64)->nullable();
+            $table->char('Menu', 1)->default('L');
+            $table->integer('lastLogIn');
+            $table->dateTime('CreateDate')->default('0001-01-01 00:00:00');
+            $table->char('Art', 30)->nullable();
+            $table->text('kommentar')->nullable();
+            $table->string('Hometown')->default('');
+            $table->string('api_key', 32);
+            $table->integer('got_voucher');
+            $table->integer('arrival_date')->nullable();
+            $table->integer('planned_arrival_date');
+            $table->integer('planned_departure_date')->nullable();
+            $table->boolean('email_by_human_allowed');
+
+            $table->index('api_key', 'api_key');
+            $table->index('password_recovery_token', 'password_recovery_token');
+            $table->index('force_active', 'force_active');
+            $table->index(['arrival_date', 'planned_arrival_date'], 'arrival_date');
+            $table->index('planned_departure_date', 'planned_departure_date');
+        });
+
+        foreach (User::all() as $user) {
+            /** @var User $user */
+            $contact = $user->contact;
+            $personal = $user->personalData;
+            $settings = $user->settings;
+            $state = $user->state;
+
+            $this->schema
+                ->getConnection()
+                ->table('User')
+                ->insert([
+                    'UID'                    => $user->id,
+                    'Nick'                   => $user->name,
+                    'Name'                   => $personal->last_name,
+                    'Vorname'                => $personal->first_name,
+                    'DECT'                   => $contact->dect,
+                    'Handy'                  => $contact->mobile,
+                    'email'                  => $user->email,
+                    'email_shiftinfo'        => $settings->email_shiftinfo,
+                    'Size'                   => $personal->shirt_size,
+                    'Passwort'               => $user->password,
+                    'Gekommen'               => $state->arrived,
+                    'Aktiv'                  => $state->active,
+                    'force_active'           => $state->force_active,
+                    'Tshirt'                 => $state->got_shirt,
+                    'color'                  => $settings->theme,
+                    'Sprache'                => $settings->language,
+                    'lastLogIn'              => $user->last_login_at ? $user->last_login_at->getTimestamp() : null,
+                    'CreateDate'             => $user->created_at ? $user->created_at->toDateTimeString() : null,
+                    'api_key'                => $user->api_key,
+                    'got_voucher'            => $state->got_voucher,
+                    'arrival_date'           => $personal->arrival_date ? $personal->arrival_date->getTimestamp() : null,
+                    'planned_arrival_date'   => $personal->planned_arrival_date ? $personal->planned_arrival_date->getTimestamp() : null,
+                    'planned_departure_date' => $personal->planned_departure_date ? $personal->planned_departure_date->getTimestamp() : null,
+                    'email_by_human_allowed' => $settings->email_human,
+                ]);
+        }
+
+        foreach (PasswordReset::all() as $passwordReset) {
+            /** @var PasswordReset $passwordReset */
+            $this->schema->getConnection()
+                ->table('User')
+                ->where('UID', '=', $passwordReset->user_id)
+                ->update(['password_recovery_token' => $passwordReset->token]);
+        }
+
+        $this->schema->drop('users_personal_data');
+        $this->schema->drop('users_contact');
+        $this->schema->drop('users_settings');
+        $this->schema->drop('users_state');
+        $this->schema->drop('password_resets');
+
+        $this->changeReferences(
+            'users',
+            'id',
+            'User',
+            'UID',
+            'integer'
+        );
+
+        $this->schema->drop('users');
+    }
+
+    /**
+     * @param Blueprint $table
+     */
+    protected function referencesUser(Blueprint $table)
+    {
+        $table->unsignedInteger('user_id');
+
+        $table->primary('user_id');
+        $table->foreign('user_id')
+            ->references('id')->on('users')
+            ->onDelete('cascade');
+    }
+}
diff --git a/db/migrations/ChangesReferences.php b/db/migrations/ChangesReferences.php
new file mode 100644
index 00000000..d50f552e
--- /dev/null
+++ b/db/migrations/ChangesReferences.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Engelsystem\Migrations;
+
+use Illuminate\Database\Schema\Blueprint;
+
+trait ChangesReferences
+{
+    /**
+     * @param string $fromTable
+     * @param string $fromColumn
+     * @param string $targetTable
+     * @param string $targetColumn
+     * @param string $type
+     */
+    protected function changeReferences($fromTable, $fromColumn, $targetTable, $targetColumn, $type)
+    {
+        $references = $this->getReferencingTables($fromTable, $fromColumn);
+
+        foreach ($references as $reference) {
+            /** @var stdClass $reference */
+            $this->schema->table($reference->table, function (Blueprint $table) use ($reference) {
+                $table->dropForeign($reference->constraint);
+            });
+
+            $this->schema->table($reference->table,
+                function (Blueprint $table) use ($reference, $targetTable, $targetColumn, $type) {
+                    $table->{$type}($reference->column)->change();
+
+                    $table->foreign($reference->column)
+                        ->references($targetColumn)->on($targetTable)
+                        ->onDelete('cascade');
+                });
+        }
+    }
+
+    /**
+     * @param string $table
+     * @param string $column
+     * @return array
+     */
+    protected function getReferencingTables($table, $column): array
+    {
+        return $this->schema
+            ->getConnection()
+            ->select(
+                '
+                    SELECT
+                            `TABLE_NAME` as "table",
+                            `COLUMN_NAME` as "column",
+                            `CONSTRAINT_NAME` as "constraint"
+                    FROM information_schema.KEY_COLUMN_USAGE
+                    WHERE REFERENCED_TABLE_SCHEMA = ?
+                    AND REFERENCED_TABLE_NAME = ?
+                    AND REFERENCED_COLUMN_NAME = ?
+                ',
+                [
+                    $this->schema->getConnection()->getDatabaseName(),
+                    $table,
+                    $column,
+                ]
+            );
+    }
+}
diff --git a/src/Models/User/Contact.php b/src/Models/User/Contact.php
new file mode 100644
index 00000000..8adf9df7
--- /dev/null
+++ b/src/Models/User/Contact.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+/**
+ * @property string  $dect
+ * @property string  $email
+ * @property string  $mobile
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Contact whereDect($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Contact whereEmail($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Contact whereMobile($value)
+ */
+class Contact extends HasUserModel
+{
+    /** @var string The table associated with the model */
+    protected $table = 'users_contact';
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'user_id',
+        'dect',
+        'email',
+        'mobile',
+    ];
+}
diff --git a/src/Models/User/HasUserModel.php b/src/Models/User/HasUserModel.php
new file mode 100644
index 00000000..89dbd642
--- /dev/null
+++ b/src/Models/User/HasUserModel.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+use Engelsystem\Models\BaseModel;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * @property integer $user_id
+ *
+ * @method static \Illuminate\Database\Query\Builder|static whereUserId($value)
+ */
+abstract class HasUserModel extends BaseModel
+{
+    /** @var string The primary key for the model */
+    protected $primaryKey = 'user_id';
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'user_id',
+    ];
+
+    /**
+     * @return BelongsTo
+     */
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+}
diff --git a/src/Models/User/PasswordReset.php b/src/Models/User/PasswordReset.php
new file mode 100644
index 00000000..b65258c5
--- /dev/null
+++ b/src/Models/User/PasswordReset.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+/**
+ * @property string         $token
+ * @property \Carbon\Carbon $created_at
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PasswordReset whereToken($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PasswordReset whereCreatedAt($value)
+ */
+class PasswordReset extends HasUserModel
+{
+    /** @var bool enable timestamps for created_at */
+    public $timestamps = true;
+
+    /** @var null Disable updated_at */
+    const UPDATED_AT = null;
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'user_id',
+        'token',
+    ];
+}
diff --git a/src/Models/User/PersonalData.php b/src/Models/User/PersonalData.php
new file mode 100644
index 00000000..bdd0bafb
--- /dev/null
+++ b/src/Models/User/PersonalData.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+/**
+ * @property string         $first_name
+ * @property string         $last_name
+ * @property string         $shirt_size
+ * @property \Carbon\Carbon $arrival_date
+ * @property \Carbon\Carbon $planned_arrival_date
+ * @property \Carbon\Carbon $planned_departure_date
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData whereFirstName($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData whereLastName($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData whereShirtSize($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData whereArrivalDate($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData wherePlannedArrivalDate($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData wherePlannedDepartureDate($value)
+ */
+class PersonalData extends HasUserModel
+{
+    /** @var string The table associated with the model */
+    protected $table = 'users_personal_data';
+
+    /** @var array The attributes that should be mutated to dates */
+    protected $dates = [
+        'arrival_date',
+        'planned_arrival_date',
+        'planned_departure_date',
+    ];
+
+    /** The attributes that are mass assignable. */
+    protected $fillable = [
+        'user_id',
+        'first_name',
+        'last_name',
+        'shirt_size',
+        'arrival_date',
+        'planned_arrival_date',
+        'planned_departure_date',
+    ];
+}
diff --git a/src/Models/User/Settings.php b/src/Models/User/Settings.php
new file mode 100644
index 00000000..8f86e123
--- /dev/null
+++ b/src/Models/User/Settings.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+/**
+ * @property string $language
+ * @property int    $theme
+ * @property bool   $email_human
+ * @property bool   $email_shiftinfo
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Settings whereLanguage($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Settings whereTheme($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Settings whereEmailHuman($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Settings whereEmailShiftinfo($value)
+ */
+class Settings extends HasUserModel
+{
+    /** @var string The table associated with the model */
+    protected $table = 'users_settings';
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'user_id',
+        'language',
+        'theme',
+        'email_human',
+        'email_shiftinfo',
+    ];
+}
diff --git a/src/Models/User/State.php b/src/Models/User/State.php
new file mode 100644
index 00000000..6a1876ed
--- /dev/null
+++ b/src/Models/User/State.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+/**
+ * @property bool $arrived
+ * @property bool $active
+ * @property bool $force_active
+ * @property bool $got_shirt
+ * @property int  $got_voucher
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State whereArrived($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State whereActive($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State whereForceActive($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State whereGotShirt($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State whereGotVoucher($value)
+ */
+class State extends HasUserModel
+{
+    /** @var string The table associated with the model */
+    protected $table = 'users_state';
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'user_id',
+        'arrived',
+        'active',
+        'force_active',
+        'got_shirt',
+        'got_voucher',
+    ];
+}
diff --git a/src/Models/User/User.php b/src/Models/User/User.php
new file mode 100644
index 00000000..d2a5129d
--- /dev/null
+++ b/src/Models/User/User.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace Engelsystem\Models\User;
+
+use Engelsystem\Models\BaseModel;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+
+/**
+ * @property integer                                                                       $id
+ * @property string                                                                        $name
+ * @property string                                                                        $email
+ * @property string                                                                        $password
+ * @property string                                                                        $api_key
+ * @property \Carbon\Carbon                                                                $last_login_at
+ * @property \Carbon\Carbon                                                                $created_at
+ * @property \Carbon\Carbon                                                                $updated_at
+ *
+ * @property-read \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Contact      $contact
+ * @property-read \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\PersonalData $personalData
+ * @property-read \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\Settings     $settings
+ * @property-read \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\State        $state
+ *
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereId($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereName($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereEmail($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User wherePassword($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereApiKey($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereLastLoginAt($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereCreatedAt($value)
+ * @method static \Illuminate\Database\Query\Builder|\Engelsystem\Models\User\User whereUpdatedAt($value)
+ */
+class User extends BaseModel
+{
+    /** @var bool enable timestamps */
+    public $timestamps = true;
+
+    /** The attributes that are mass assignable */
+    protected $fillable = [
+        'name',
+        'password',
+        'email',
+        'api_key',
+        'last_login_at',
+    ];
+
+    /** @var array The attributes that should be hidden for serialization */
+    protected $hidden = [
+        'api_key',
+        'password',
+    ];
+
+    /** @var array The attributes that should be mutated to dates */
+    protected $dates = [
+        'last_login_at',
+    ];
+
+    /**
+     * @return HasOne
+     */
+    public function contact()
+    {
+        return $this
+            ->hasOne(Contact::class)
+            ->withDefault();
+    }
+
+    /**
+     * @return HasOne
+     */
+    public function personalData()
+    {
+        return $this
+            ->hasOne(PersonalData::class)
+            ->withDefault();
+    }
+
+    /**
+     * @return HasOne
+     */
+    public function settings()
+    {
+        return $this
+            ->hasOne(Settings::class)
+            ->withDefault();
+    }
+
+    /**
+     * @return HasOne
+     */
+    public function state()
+    {
+        return $this
+            ->hasOne(State::class)
+            ->withDefault();
+    }
+}
diff --git a/tests/Unit/Models/User/HasUserModelTest.php b/tests/Unit/Models/User/HasUserModelTest.php
new file mode 100644
index 00000000..07f3d726
--- /dev/null
+++ b/tests/Unit/Models/User/HasUserModelTest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Models;
+
+use Engelsystem\Models\User\HasUserModel;
+use Engelsystem\Test\Unit\HasDatabase;
+use Engelsystem\Test\Unit\Models\User\Stub\HasUserModelImplementation;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use PHPUnit\Framework\TestCase;
+
+class HasUserModelTest extends TestCase
+{
+    use HasDatabase;
+
+    /**
+     * @covers \Engelsystem\Models\User\HasUserModel::user
+     */
+    public function testHasOneRelations()
+    {
+        /** @var HasUserModel $contact */
+        $model = new HasUserModelImplementation();
+
+        $this->assertInstanceOf(BelongsTo::class, $model->user());
+    }
+
+    /**
+     * Prepare test
+     */
+    protected function setUp()
+    {
+        $this->initDatabase();
+    }
+}
diff --git a/tests/Unit/Models/User/Stub/HasUserModelImplementation.php b/tests/Unit/Models/User/Stub/HasUserModelImplementation.php
new file mode 100644
index 00000000..0456eb6a
--- /dev/null
+++ b/tests/Unit/Models/User/Stub/HasUserModelImplementation.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Models\User\Stub;
+
+use Engelsystem\Models\User\HasUserModel;
+
+class HasUserModelImplementation extends HasUserModel
+{
+
+}
diff --git a/tests/Unit/Models/User/UserTest.php b/tests/Unit/Models/User/UserTest.php
new file mode 100644
index 00000000..c30f7761
--- /dev/null
+++ b/tests/Unit/Models/User/UserTest.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Models;
+
+use Engelsystem\Models\User\Contact;
+use Engelsystem\Models\User\HasUserModel;
+use Engelsystem\Models\User\PersonalData;
+use Engelsystem\Models\User\Settings;
+use Engelsystem\Models\User\State;
+use Engelsystem\Models\User\User;
+use Engelsystem\Test\Unit\HasDatabase;
+use PHPUnit\Framework\TestCase;
+
+class UserTest extends TestCase
+{
+    use HasDatabase;
+
+    protected $data = [
+        'name'     => 'lorem',
+        'password' => '',
+        'email'    => 'foo@bar.batz',
+        'api_key'  => '',
+    ];
+
+    /**
+     * @return array
+     */
+    public function hasOneRelationsProvider()
+    {
+        return [
+            [
+                Contact::class,
+                'contact',
+                [
+                    'dect'   => '1234',
+                    'email'  => 'foo@bar.batz',
+                    'mobile' => '1234/12341234',
+                ]
+            ],
+            [
+                PersonalData::class,
+                'personalData',
+                [
+                    'first_name' => 'Foo'
+                ]
+            ],
+            [
+                Settings::class,
+                'settings',
+                [
+                    'language' => 'de_DE',
+                    'theme'    => 4,
+                ]
+            ],
+            [
+                State::class,
+                'state',
+                [
+                    'force_active' => true,
+                ]
+            ],
+        ];
+    }
+
+    /**
+     * @covers       \Engelsystem\Models\User\User::contact
+     * @covers       \Engelsystem\Models\User\User::personalData
+     * @covers       \Engelsystem\Models\User\User::settings
+     * @covers       \Engelsystem\Models\User\User::state
+     *
+     * @dataProvider hasOneRelationsProvider
+     *
+     * @param string $class
+     * @param string $name
+     * @param array  $data
+     */
+    public function testHasOneRelations($class, $name, $data)
+    {
+        $user = new User($this->data);
+        $user->save();
+
+        /** @var HasUserModel $contact */
+        $contact = new $class($data);
+        $contact->user()
+            ->associate($user)
+            ->save();
+
+        $this->assertArraySubset($data, (array)$user->{$name}->attributesToArray());
+    }
+
+    /**
+     * Prepare test
+     */
+    protected function setUp()
+    {
+        $this->initDatabase();
+    }
+}