Revert "revert string comparison changes"

This reverts commit e51fb9b10a79ecf319a736ca95d1643dea175dc1.
diff --git a/TestFoundation/TestNSString.swift b/TestFoundation/TestNSString.swift
index 0266819..71efa58 100755
--- a/TestFoundation/TestNSString.swift
+++ b/TestFoundation/TestNSString.swift
@@ -1238,14 +1238,7 @@
     // ASCII cases
     ComparisonTest("t", "tt"),
     ComparisonTest("t", "Tt"),
-    ComparisonTest("\u{0}", "",
-        reason: {
-#if _runtime(_ObjC)
-    return ""
-#else
-    return "https://bugs.swift.org/browse/SR-332"
-#endif
-    }()),
+    ComparisonTest("\u{0}", ""),
     ComparisonTest("\u{0}", "\u{0}",
         reason: "https://bugs.swift.org/browse/SR-332"),
     ComparisonTest("\r\n", "t"),