fix: Initialise access token provider with provided national cloud

Author: Ndiritu

src/Authentication/GraphPhpLeagueAuthenticationProvider.php

@@ -33,8 +33,7 @@ public function __construct(
         string $nationalCloud = NationalCloud::GLOBAL
     )
     {
-        $accessTokenProvider = new GraphPhpLeagueAccessTokenProvider($tokenRequestContext, $scopes, $nationalCloud);
-        parent::__construct($tokenRequestContext, $scopes, $accessTokenProvider->getAllowedHosts());
+        $this->setAccessTokenProvider(new GraphPhpLeagueAccessTokenProvider($tokenRequestContext, $scopes, $nationalCloud));
     }
 
 }

tests/Authentication/GraphPhpLeagueAuthenticationProviderTest.php

@@ -4,6 +4,7 @@
 
 use Microsoft\Graph\Core\Authentication\GraphPhpLeagueAccessTokenProvider;
 use Microsoft\Graph\Core\Authentication\GraphPhpLeagueAuthenticationProvider;
+use Microsoft\Graph\Core\NationalCloud;
 use Microsoft\Kiota\Authentication\Oauth\ClientCredentialContext;
 use PHPUnit\Framework\TestCase;
 
@@ -15,4 +16,12 @@ public function testSuccessfullyInitializesClass(): void
         $leagueAuthProvider = new GraphPhpLeagueAuthenticationProvider($context, []);
         $this->assertNotEmpty($leagueAuthProvider->getAccessTokenProvider()->getAllowedHostsValidator()->getAllowedHosts());
     }
+
+    public function testNationalCloudUrlIsUsed(): void
+    {
+        $context = new ClientCredentialContext('tenant', 'clientId', 'secret');
+        $leagueAuthProvider = new GraphPhpLeagueAuthenticationProvider($context, [], NationalCloud::US_GOV);
+        $this->assertEquals('https://login.microsoftonline.us/tenant/oauth2/v2.0/authorize', $leagueAuthProvider->getAccessTokenProvider()->getOauthProvider()->getBaseAuthorizationUrl());
+        $this->assertEquals('https://login.microsoftonline.us/tenant/oauth2/v2.0/token', $leagueAuthProvider->getAccessTokenProvider()->getOauthProvider()->getBaseAccessTokenUrl([]));
+    }
 }