Merge pull request #2230 from brentdax/xfail-xmldoc

XFAIL TestXMLDocument.test_validation_success()

Author: shahmishal

TestFoundation/TestXMLDocument.swift

@@ -24,7 +24,8 @@ class TestXMLDocument : LoopbackServerTest {
             ("test_processingInstruction", test_processingInstruction),
             ("test_parseXMLString", test_parseXMLString),
             ("test_prefixes", test_prefixes),
-            ("test_validation_success", test_validation_success),
+            /* ⚠️ */ ("test_validation_success", testExpectedToFail(test_validation_success,
+            /* ⚠️ */     #"<https://bugs.swift.org/browse/SR-10643> Could not build URI for external subset "http://127.0.0.1:-2/DTDs/PropertyList-1.0.dtd""#)),
             ("test_validation_failure", test_validation_failure),
             ("test_dtd", test_dtd),
             ("test_documentWithDTD", test_documentWithDTD),