Change token_endpoint_auth_methods_supported to be an array.

Author: Potherca

src/Config/Server.php

@@ -61,7 +61,7 @@ final public function __construct(array $data, bool $strict = false)
 			OidcMeta::TOKEN_TYPES_SUPPORTED => array("legacyPop","dpop"),
 			OidcMeta::RESPONSE_MODES_SUPPORTED => array("query","fragment"),
 			OidcMeta::GRANT_TYPES_SUPPORTED => array("authorization_code","implicit","refresh_token","client_credentials"),
-			OidcMeta::TOKEN_ENDPOINT_AUTH_METHODS_SUPPORTED => "client_secret_basic",
+			OidcMeta::TOKEN_ENDPOINT_AUTH_METHODS_SUPPORTED => ["client_secret_basic"],
 			OidcMeta::TOKEN_ENDPOINT_AUTH_SIGNING_ALG_VALUES_SUPPORTED => ["RS256"],
 			OidcMeta::CODE_CHALLENGE_METHODS_SUPPORTED => ["S256"],
 			OidcMeta::DPOP_SIGNING_ALG_VALUES_SUPPORTED => ["RS256"],

tests/unit/Config/ServerTest.php

@@ -108,7 +108,7 @@ final public function testServerConfigShouldReturnExpectedValuesWhenSerializedWi
             'token_types_supported' => ['legacyPop','dpop'],
             'response_modes_supported' => ['query', 'fragment'],
             'grant_types_supported' => ['authorization_code', 'implicit', 'refresh_token', 'client_credentials'],
-            'token_endpoint_auth_methods_supported' => 'client_secret_basic',
+            'token_endpoint_auth_methods_supported' => ['client_secret_basic'],
             'token_endpoint_auth_signing_alg_values_supported' => ['RS256'],
             'display_values_supported' => [],
             'claim_types_supported' => ['normal'],