Add custom assert to AbstractTestCase that compares JWT.

Author: Potherca

tests/unit/AbstractTestCase.php

@@ -3,12 +3,29 @@
 namespace Pdsinterop\Solid\Auth;
 
 use ArgumentCountError;
+use Pdsinterop\Solid\Auth\Utils\Base64Url;
 use PHPUnit\Framework\TestCase;
 
 abstract class AbstractTestCase extends TestCase
 {
     ////////////////////////////// CUSTOM ASSERTS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
 
+    public function assertJwtEquals(array $expected, string $actual): void
+    {
+        $encoded = explode('.', $actual);
+
+        $decoded = array_map([Base64Url::class, 'decode'], $encoded);
+
+        // We can not easily compare the signatures in PHP, as the numeric
+        // representation of the binary string is INF (infinity). So unless
+        // something is passed to compare, we discard the signature
+        if (count($decoded) === 3 && count($expected) === 2) {
+            unset ($decoded[2]);
+        }
+
+        $this->assertEquals($expected, $decoded);
+    }
+
     public function expectArgumentCountError(int $argumentCount): void
     {
         $this->expectException(ArgumentCountError::class);

tests/unit/TokenGeneratorTest.php

@@ -179,10 +179,12 @@ final public function testRegistrationAccessTokenGeneration(): void
 
         $actual = $tokenGenerator->generateRegistrationAccessToken('mock client ID', $privateKey);
 
-        $expected = <<<JWT
-eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJtb2NrIGlzc3VlciIsImF1ZCI6Im1vY2sgY2xpZW50IElEIiwic3ViIjoibW9jayBjbGllbnQgSUQifQ.hNpQ3R3krigm6iQ-wWXDzy1bq_txFAlymXJZ4VZd9otTqSNZ8qWB1b2MW6RnFjwlTJrbPzD-yksAn0R7Wwhl5NYnvm-YNlQ6mqKybo-DIfFV6uw6b3b8R4BmfcxVhHuiGDYbBvKiO955KGA4t8FLlBBVLPdREz5w-LYRndDSdho3E62eKX5eKndufPRBOO8bzBJBSbrFLf6kj1hape9uyLvNEmeP9Rq26K98GmDRN-BxAoQlC_EodIgqajqETtKSzsf5bBasu6EpSOOOFGRijS8RCqBt4f1Kkb5ltE_t9TBp0ceBSOB6lGJEShieulEf5prBwLrYMkSFCVTpn5Gwow
-JWT;
-        $this->assertEquals($expected, $actual);
+        $expected = [
+            '{"typ":"JWT","alg":"RS256"}',
+            '{"iss":"mock issuer","aud":"mock client ID","sub":"mock client ID"}',
+        ];
+
+        $this->assertJwtEquals($expected, $actual);
     }
 
     /**