diff --git a/app/DataMapper/CompanySettings.php b/app/DataMapper/CompanySettings.php
index 6bc0b80316cf..b5afc076f092 100644
--- a/app/DataMapper/CompanySettings.php
+++ b/app/DataMapper/CompanySettings.php
@@ -663,6 +663,7 @@ class CompanySettings extends BaseSettings
                 '$task.line_total',
             ],
             'total_columns' => [
+                '$net_subtotal',
                 '$subtotal',
                 '$discount',
                 '$custom_surcharge1',
diff --git a/app/Http/Controllers/Auth/LoginController.php b/app/Http/Controllers/Auth/LoginController.php
index a1960438fcb6..efd75e38415c 100644
--- a/app/Http/Controllers/Auth/LoginController.php
+++ b/app/Http/Controllers/Auth/LoginController.php
@@ -16,6 +16,7 @@ use App\DataMapper\Analytics\LoginSuccess;
 use App\Events\User\UserLoggedIn;
 use App\Http\Controllers\BaseController;
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Login\LoginRequest;
 use App\Jobs\Account\CreateAccount;
 use App\Jobs\Company\CreateCompanyToken;
 use App\Jobs\Util\SystemLogger;
@@ -156,7 +157,7 @@ class LoginController extends BaseController
      *       ),
      *     )
      */
-    public function apiLogin(Request $request)
+    public function apiLogin(LoginRequest $request)
     {
         $this->forced_includes = ['company_users'];
 
diff --git a/app/Http/Controllers/CompanyController.php b/app/Http/Controllers/CompanyController.php
index 913ce2d9564b..e77fa41e7e74 100644
--- a/app/Http/Controllers/CompanyController.php
+++ b/app/Http/Controllers/CompanyController.php
@@ -25,7 +25,10 @@ use App\Jobs\Company\CreateCompany;
 use App\Jobs\Company\CreateCompanyPaymentTerms;
 use App\Jobs\Company\CreateCompanyTaskStatuses;
 use App\Jobs\Company\CreateCompanyToken;
+use App\Jobs\Mail\NinjaMailerJob;
+use App\Jobs\Mail\NinjaMailerObject;
 use App\Jobs\Ninja\RefundCancelledAccount;
+use App\Mail\Company\CompanyDeleted;
 use App\Models\Account;
 use App\Models\Company;
 use App\Models\CompanyUser;
@@ -504,6 +507,15 @@ class CompanyController extends BaseController
             $company->company_users->each(function ($company_user){
                 $company_user->forceDelete();
             });
+                
+                $other_company = $company->account->companies->where('id', '!=', $company->id)->first();
+
+                $nmo = new NinjaMailerObject;
+                $nmo->mailable = new CompanyDeleted($company->present()->name, auth()->user(), $company->account, $company->settings);
+                $nmo->company = $other_company;
+                $nmo->settings = $other_company->settings;
+                $nmo->to_user = auth()->user();
+                NinjaMailerJob::dispatch($nmo);
 
             $company->delete();
 
diff --git a/app/Http/Middleware/PasswordProtection.php b/app/Http/Middleware/PasswordProtection.php
index e3a80cf45730..54163fac473c 100644
--- a/app/Http/Middleware/PasswordProtection.php
+++ b/app/Http/Middleware/PasswordProtection.php
@@ -44,6 +44,14 @@ class PasswordProtection
         else
             $timeout = $timeout/1000;
 
+        //test if password if base64 encoded
+        $x_api_password = $request->header('X-API-PASSWORD');
+
+        if($request->header('X-API-PASSWORD-BASE64'))
+        {
+            $x_api_password = base64_decode($request->header('X-API-PASSWORD-BASE64'));
+        }
+
         if (Cache::get(auth()->user()->hashed_id.'_'.auth()->user()->account_id.'_logged_in')) {
 
             Cache::put(auth()->user()->hashed_id.'_'.auth()->user()->account_id.'_logged_in', Str::random(64), $timeout);
@@ -66,7 +74,7 @@ class PasswordProtection
                 ];
 
                 //If OAuth and user also has a password set  - check both
-                if ($existing_user = MultiDB::hasUser($query) && auth()->user()->company()->oauth_password_required && auth()->user()->has_password && Hash::check(auth()->user()->password, $request->header('X-API-PASSWORD'))) {
+                if ($existing_user = MultiDB::hasUser($query) && auth()->user()->company()->oauth_password_required && auth()->user()->has_password && Hash::check(auth()->user()->password, $x_api_password)) {
 
                     nlog("existing user with password");
 
@@ -86,7 +94,7 @@ class PasswordProtection
             return response()->json($error, 412);
 
 
-        }elseif ($request->header('X-API-PASSWORD') && Hash::check($request->header('X-API-PASSWORD'), auth()->user()->password))  {
+        }elseif ($x_api_password && Hash::check($x_api_password, auth()->user()->password))  {
 
             Cache::put(auth()->user()->hashed_id.'_'.auth()->user()->account_id.'_logged_in', Str::random(64), $timeout);
 
diff --git a/app/Http/Requests/Login/LoginRequest.php b/app/Http/Requests/Login/LoginRequest.php
new file mode 100644
index 000000000000..bb8db25bd0a5
--- /dev/null
+++ b/app/Http/Requests/Login/LoginRequest.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+
+namespace App\Http\Requests\Login;
+
+use App\Http\Requests\Request;
+
+class LoginRequest extends Request
+{
+
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'email' => 'required',
+            'password' => 'required',
+        ];
+    }
+
+    protected function prepareForValidation()
+    {
+        $input = $this->all();
+
+        // if(base64_decode(base64_encode($input['password'])) === $input['password'])
+        //     $input['password'] = base64_decode($input['password']);
+
+        // nlog($input['password']);
+        
+        $this->replace($input);
+    }
+}
diff --git a/app/Listeners/Misc/InvitationViewedListener.php b/app/Listeners/Misc/InvitationViewedListener.php
index 4df1f36209ce..e77b0d08296e 100644
--- a/app/Listeners/Misc/InvitationViewedListener.php
+++ b/app/Listeners/Misc/InvitationViewedListener.php
@@ -47,8 +47,6 @@ class InvitationViewedListener implements ShouldQueue
         $entity_name = lcfirst(class_basename($event->entity));
         $invitation = $event->invitation;
 
-        // $notification = new EntityViewedNotification($invitation, $entity_name);
-
         $nmo = new NinjaMailerObject;
         $nmo->mailable = new NinjaMailer( (new EntityViewedObject($invitation, $entity_name))->build() );
         $nmo->company = $invitation->company;
@@ -57,8 +55,9 @@ class InvitationViewedListener implements ShouldQueue
 
         foreach ($invitation->company->company_users as $company_user) {
             $entity_viewed = "{$entity_name}_viewed";
+            $entity_viewed_all = "{$entity_name}_viewed_all";
 
-            $methods = $this->findUserNotificationTypes($invitation, $company_user, $entity_name, ['all_notifications', $entity_viewed]);
+            $methods = $this->findUserNotificationTypes($invitation, $company_user, $entity_name, ['all_notifications', $entity_viewed, $entity_viewed_all]);
 
             if (($key = array_search('mail', $methods)) !== false) {
                 unset($methods[$key]);
@@ -68,16 +67,7 @@ class InvitationViewedListener implements ShouldQueue
 
             }
 
-            // $notification->method = $methods;
-
-            // $company_user->user->notify($notification);
         }
 
-        // if (isset($invitation->company->slack_webhook_url)) {
-        //     $notification->method = ['slack'];
-
-            // Notification::route('slack', $invitation->company->slack_webhook_url)
-            //             ->notify($notification);
-        // }
     }
 }
diff --git a/app/Listeners/SendVerificationNotification.php b/app/Listeners/SendVerificationNotification.php
index b64c2e0d03ca..99e095b10d60 100644
--- a/app/Listeners/SendVerificationNotification.php
+++ b/app/Listeners/SendVerificationNotification.php
@@ -16,6 +16,7 @@ use App\Jobs\Mail\NinjaMailerJob;
 use App\Jobs\Mail\NinjaMailerObject;
 use App\Libraries\MultiDB;
 use App\Mail\Admin\VerifyUserObject;
+use App\Mail\User\UserAdded;
 use App\Notifications\Ninja\VerifyUser;
 use App\Utils\Ninja;
 use Exception;
@@ -52,5 +53,13 @@ class SendVerificationNotification implements ShouldQueue
 
         $event->user->service()->invite($event->company);
 
+        $nmo = new NinjaMailerObject;
+        $nmo->mailable = new UserAdded($event->company, $event->creating_user, $event->user);
+        $nmo->company = $event->company;
+        $nmo->settings = $event->company->settings;
+        $nmo->to_user = $event->creating_user;
+        NinjaMailerJob::dispatch($nmo);
+
+
     }
 }
diff --git a/app/Mail/Company/CompanyDeleted.php b/app/Mail/Company/CompanyDeleted.php
new file mode 100644
index 000000000000..da021afeaf29
--- /dev/null
+++ b/app/Mail/Company/CompanyDeleted.php
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Mail\Company;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class CompanyDeleted extends Mailable
+{
+    // use Queueable, SerializesModels;
+
+    public $account;
+
+    public $company;
+
+    public $user;
+
+    public $settings;
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct($company, $user, $account, $settings)
+    {
+        $this->company = $company;
+        $this->user = $user;
+        $this->account = $account;
+        $this->settings = $settings;
+    }
+
+    /**
+     * Build the message.
+     *
+     * @return $this
+     */
+    public function build()
+    {
+        return $this->from(config('mail.from.address'), config('mail.from.name'))
+            ->subject(ctrans('texts.company_deleted'))
+            ->view('email.admin.company_deleted')
+            ->with([
+                'settings' => $this->settings,
+                'logo' => '',
+                'title' => ctrans('texts.company_deleted'),
+                'body' => ctrans('texts.company_deleted_body', ['company' => $this->company, 'user' => $this->user->present()->name(), 'time' => now()]),
+                'whitelabel' => $this->account->isPaid(),
+            ]);
+    }
+}
diff --git a/app/Mail/User/UserAdded.php b/app/Mail/User/UserAdded.php
new file mode 100644
index 000000000000..2c07fbbcb8a7
--- /dev/null
+++ b/app/Mail/User/UserAdded.php
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Mail\User;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class UserAdded extends Mailable
+{
+    // use Queueable, SerializesModels;
+
+    public $company;
+
+    public $user;
+
+    public $created_user;
+
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct($company, $user, $created_user)
+    {
+        $this->company = $company;
+        $this->user = $user;
+        $this->created_user = $created_user;
+    }
+
+    /**
+     * Build the message.
+     *
+     * @return $this
+     */
+    public function build()
+    {
+        return $this->from(config('mail.from.address'), config('mail.from.name'))
+            ->subject(ctrans('texts.created_user'))
+            ->view('email.admin.user_added')
+            ->with([
+                'settings' => $this->company->settings,
+                'logo' => $this->company->present()->logo(),
+                'title' => ctrans('texts.created_user'),
+                'body' => ctrans('texts.user_created_user', ['user' => $this->user->present()->name(), 'created_user' => $this->created_user->present()->name(), 'time' => now()]),
+                'whitelabel' => $this->company->account->isPaid(),
+            ]);
+    }
+}
diff --git a/app/Services/Invoice/UpdateReminder.php b/app/Services/Invoice/UpdateReminder.php
index dd7142179931..de45f5c98adc 100644
--- a/app/Services/Invoice/UpdateReminder.php
+++ b/app/Services/Invoice/UpdateReminder.php
@@ -48,7 +48,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder1_sent) &&
             $this->settings->schedule_reminder1 == 'after_invoice_date' &&
-            $this->settings->num_days_reminder1 > 0) {
+            $this->settings->enable_reminder1) {
             $reminder_date = Carbon::parse($this->invoice->date)->startOfDay()->addDays($this->settings->num_days_reminder1)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -57,7 +57,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder1_sent) &&
             $this->settings->schedule_reminder1 == 'before_due_date' &&
-            $this->settings->num_days_reminder1 > 0) {
+            $this->settings->enable_reminder1) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->subDays($this->settings->num_days_reminder1)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -66,7 +66,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder1_sent) &&
             $this->settings->schedule_reminder1 == 'after_due_date' &&
-            $this->settings->num_days_reminder1 > 0) {
+            $this->settings->enable_reminder1) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->addDays($this->settings->num_days_reminder1)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -75,7 +75,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder2_sent) &&
             $this->settings->schedule_reminder2 == 'after_invoice_date' &&
-            $this->settings->num_days_reminder2 > 0) {
+            $this->settings->enable_reminder2) {
             $reminder_date = Carbon::parse($this->invoice->date)->startOfDay()->addDays($this->settings->num_days_reminder2)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -84,7 +84,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder2_sent) &&
             $this->settings->schedule_reminder2 == 'before_due_date' &&
-            $this->settings->num_days_reminder2 > 0) {
+            $this->settings->enable_reminder2) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->subDays($this->settings->num_days_reminder2)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -93,7 +93,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder2_sent) &&
             $this->settings->schedule_reminder2 == 'after_due_date' &&
-            $this->settings->num_days_reminder2 > 0) {
+            $this->settings->enable_reminder2) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->addDays($this->settings->num_days_reminder2)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -102,7 +102,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder3_sent) &&
             $this->settings->schedule_reminder3 == 'after_invoice_date' &&
-            $this->settings->num_days_reminder3 > 0) {
+            $this->settings->enable_reminder3) {
             $reminder_date = Carbon::parse($this->invoice->date)->startOfDay()->addDays($this->settings->num_days_reminder3)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -111,7 +111,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder3_sent) &&
             $this->settings->schedule_reminder3 == 'before_due_date' &&
-            $this->settings->num_days_reminder3 > 0) {
+            $this->settings->enable_reminder3) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->subDays($this->settings->num_days_reminder3)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -120,7 +120,7 @@ class UpdateReminder extends AbstractService
 
         if (is_null($this->invoice->reminder3_sent) &&
             $this->settings->schedule_reminder3 == 'after_due_date' &&
-            $this->settings->num_days_reminder3 > 0) {
+            $this->settings->enable_reminder3) {
             $reminder_date = Carbon::parse($this->invoice->due_date)->startOfDay()->addDays($this->settings->num_days_reminder3)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
@@ -128,7 +128,7 @@ class UpdateReminder extends AbstractService
         }
 
         if ($this->invoice->last_sent_date &&
-            (int)$this->settings->endless_reminder_frequency_id > 0) {
+            $this->settings->enable_reminder_endless) {
             $reminder_date = $this->addTimeInterval($this->invoice->last_sent_date, (int)$this->settings->endless_reminder_frequency_id)->addSeconds($offset);
 
             if ($reminder_date->gt(Carbon::parse($this->invoice->next_send_date)));
diff --git a/app/Transformers/DesignTransformer.php b/app/Transformers/DesignTransformer.php
index c73d9cc8fc52..1271ed55ef7f 100644
--- a/app/Transformers/DesignTransformer.php
+++ b/app/Transformers/DesignTransformer.php
@@ -51,6 +51,7 @@ class DesignTransformer extends EntityTransformer
             'archived_at' => (int) $design->deleted_at,
             'created_at' => (int) $design->created_at,
             'is_deleted' => (bool) $design->is_deleted,
+            'is_free' => ($design->id <= 4) ? true : false,
         ];
     }
 }
diff --git a/app/Utils/HtmlEngine.php b/app/Utils/HtmlEngine.php
index 277b5adff860..f50fd27d5c4c 100644
--- a/app/Utils/HtmlEngine.php
+++ b/app/Utils/HtmlEngine.php
@@ -167,6 +167,7 @@ class HtmlEngine
         $data['$invoice.discount'] = ['value' => Number::formatMoney($this->entity_calc->getTotalDiscount(), $this->client) ?: '&nbsp;', 'label' => ctrans('texts.discount')];
         $data['$discount'] = &$data['$invoice.discount'];
         $data['$subtotal'] = ['value' => Number::formatMoney($this->entity_calc->getSubTotal(), $this->client) ?: '&nbsp;', 'label' => ctrans('texts.subtotal')];
+        $data['$net_subtotal'] = ['value' => Number::formatMoney(($this->entity_calc->getSubTotal() - $this->entity->total_taxes), $this->client) ?: '&nbsp;', 'label' => ctrans('texts.subtotal')];
         $data['$invoice.subtotal'] = &$data['$subtotal'];
 
         if ($this->entity->partial > 0) {
diff --git a/app/Utils/Ninja.php b/app/Utils/Ninja.php
index 1a31a11daf57..17c859b6f6c6 100644
--- a/app/Utils/Ninja.php
+++ b/app/Utils/Ninja.php
@@ -170,4 +170,29 @@ class Ninja
 
     //     return implode('-', $parts);
     // }
+    // 
+    
+    /*
+     * Available - but not recommended for use
+     *
+     * This will guarantee a given string IS the correct format for a 
+     * base64 encoded string ,
+     * but can't guarantee that it is a base64 encoded string
+     *  
+     */
+    public static function isBase64Encoded(string $s) : bool
+    {
+
+    // Check if there are valid base64 characters
+    if (!preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $s)) return false;
+    // Decode the string in strict mode and check the results
+    $decoded = base64_decode($s, true);
+    if(false === $decoded) return false;
+    // if string returned contains not printable chars
+    if (0 < preg_match('/((?![[:graph:]])(?!\s)(?!\p{L}))./', $decoded, $matched)) return false;
+    // Encode the string again
+    if(base64_encode($decoded) != $s) return false;
+    return true;
+
+    }
 }
diff --git a/app/Utils/SystemHealth.php b/app/Utils/SystemHealth.php
index cb87d238a52b..b98d5dd3f539 100644
--- a/app/Utils/SystemHealth.php
+++ b/app/Utils/SystemHealth.php
@@ -83,6 +83,7 @@ class SystemHealth
             'flutter_renderer' => (string)config('ninja.flutter_canvas_kit'),
             'jobs_pending' => (int) Queue::size(),
             'pdf_engine' => (string) self::getPdfEngine(),
+            'queue' => (string) config('queue.default'),
         ];
     }
 
diff --git a/resources/lang/en/texts.php b/resources/lang/en/texts.php
index 2bff23717e28..fc01b693ddaf 100644
--- a/resources/lang/en/texts.php
+++ b/resources/lang/en/texts.php
@@ -4281,6 +4281,9 @@ $LANG = array(
     'quotes_with_status_sent_can_be_approved' => 'Only quotes with "Sent" status can be approved.',
     'no_quotes_available_for_download' => 'No quotes available for download.',
     'copyright' => 'Copyright',
+    'user_created_user' => ':user created :created_user at :time',
+    'company_deleted' => 'Company deleted',
+    'company_deleted_body' => 'Company [ :company ] was deleted by :user',
 );
 
 return $LANG;
diff --git a/resources/views/email/admin/company_deleted.blade.php b/resources/views/email/admin/company_deleted.blade.php
new file mode 100644
index 000000000000..2281b8f1bdbe
--- /dev/null
+++ b/resources/views/email/admin/company_deleted.blade.php
@@ -0,0 +1,6 @@
+@component('email.template.admin', ['logo' => $logo, 'settings' => $settings])
+    <div class="center">
+        <h1>{!! $title !!}</h1>
+        <p>{!! $body !!}</p>
+    </div>
+@endcomponent
diff --git a/resources/views/email/admin/user_added.blade.php b/resources/views/email/admin/user_added.blade.php
new file mode 100644
index 000000000000..2281b8f1bdbe
--- /dev/null
+++ b/resources/views/email/admin/user_added.blade.php
@@ -0,0 +1,6 @@
+@component('email.template.admin', ['logo' => $logo, 'settings' => $settings])
+    <div class="center">
+        <h1>{!! $title !!}</h1>
+        <p>{!! $body !!}</p>
+    </div>
+@endcomponent
diff --git a/tests/Unit/Base64Test.php b/tests/Unit/Base64Test.php
new file mode 100644
index 000000000000..7aed2415f033
--- /dev/null
+++ b/tests/Unit/Base64Test.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://opensource.org/licenses/AAL
+ */
+namespace Tests\Unit;
+
+use App\Utils\Ninja;
+use Tests\TestCase;
+
+/**
+ * @test
+ */
+class Base64Test extends TestCase
+{
+    /**
+     * Important consideration with Base64
+     * encoding checks.
+     *
+     * No method can guarantee against false positives.
+     */
+    public function setUp() :void
+    {
+        parent::setUp();
+    }
+
+    public function testBadBase64String()
+    {
+        $this->assertFalse(Ninja::isBase64Encoded('x'));
+    }
+
+    public function testCorrectBase64Encoding()
+    {
+        $this->assertTrue(Ninja::isBase64Encoded('MTIzNDU2'));
+    }
+
+    public function testBadBase64StringScenaro1()
+    {
+        $this->assertFalse(Ninja::isBase64Encoded('Matthies'));
+    }
+
+    public function testBadBase64StringScenaro2()
+    {
+        $this->assertFalse(Ninja::isBase64Encoded('Barthels'));
+    }
+
+    public function testBadBase64StringScenaro3()
+    {
+        $this->assertFalse(Ninja::isBase64Encoded('aaa'));
+    }
+
+}
\ No newline at end of file