improve error exceptiosn for missing credentials

src/Exceptions/MailcoachException.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Spatie\MailcoachSdk\Exceptions;
+
+class MailcoachException extends \RuntimeException
+{
+    public static function missingApiToken(): self
+    {
+        return new static('No Mailcoach API token was provided. Please provide an API token in the `mailcoach-sdk.api_token` config key.');
+    }
+
+    public static function missingEndpoint(): self
+    {
+        return new static('No Mailcoach endpoint was provided. Please provide an endpoint in the `mailcoach-sdk.endpoint` config key.');
+    }
+}

src/MailcoachSdkServiceProvider.php

@@ -4,6 +4,7 @@
 
 use Spatie\LaravelPackageTools\Package;
 use Spatie\LaravelPackageTools\PackageServiceProvider;
+use Spatie\MailcoachSdk\Exceptions\MailcoachException;
 
 class MailcoachSdkServiceProvider extends PackageServiceProvider
 {
@@ -14,15 +15,15 @@ public function configurePackage(Package $package): void
             ->hasConfigFile();
     }
 
-    public function registeringPackage()
+    public function registeringPackage(): void
     {
         $this->app->bind(Mailcoach::class, function () {
             if (config('mailcoach-sdk.api_token') === null) {
-                return null;
+                throw MailcoachException::missingApiToken();
             }
 
             if (config('mailcoach-sdk.endpoint') === null) {
-                return null;
+                throw MailcoachException::missingEndpoint();
             }
 
             return new Mailcoach(

tests/MailcoachTest.php

@@ -15,3 +15,25 @@
 
     expect($token)->toBe('fake-token');
 });
+
+it('throws an exception when no api token is set', function () {
+    (new MailcoachSdkServiceProvider($this->app))->bootingPackage();
+
+    config()->set('mailcoach-sdk', [
+        'api_token' => null,
+        'endpoint' => 'fake-endpoint',
+    ]);
+
+    Mailcoach::apiToken();
+})->throws('No Mailcoach API token was provided. Please provide an API token in the `mailcoach-sdk.api_token` config key.');
+
+it('throws an exception when no endpoint is set', function () {
+    (new MailcoachSdkServiceProvider($this->app))->bootingPackage();
+
+    config()->set('mailcoach-sdk', [
+        'api_token' => 'fake-token',
+        'endpoint' => null,
+    ]);
+
+    Mailcoach::apiToken();
+})->throws('No Mailcoach endpoint was provided. Please provide an endpoint in the `mailcoach-sdk.endpoint` config key.');