add tests for base64Binary node

Author: LamentXU123

ext/soap/tests/scalar_error_messages.phpt

@@ -44,7 +44,9 @@ function run_case(string $label, string $type, string $value): void {
 
 run_case('double', 'xsd:double', 'abc');
 run_case('long', 'xsd:long', 'abc');
+run_case('base64Binary node', 'xsd:base64Binary', '<value>abc</value>');
 ?>
 --EXPECT--
 double: SOAP-ERROR: Encoding: Invalid value for type 'double'
 long: SOAP-ERROR: Encoding: Invalid value for type 'long'
+base64Binary node: SOAP-ERROR: Encoding: Type 'base64Binary' value must contain a single text or CDATA node