Add corelib tests

test/codegen/corelib/uri_base_test.dart

Index: test/codegen/corelib/uri_base_test.dart
diff --git a/test/codegen/language/closure4_test.dart b/test/codegen/corelib/uri_base_test.dart
similarity index 54%
copy from test/codegen/language/closure4_test.dart
copy to test/codegen/corelib/uri_base_test.dart
index a1b099673ab76d7f0c1c52303efc29932cc63061..0954aabeeed9b373a164d69b7673d8e529a7600d 100644
--- a/test/codegen/language/closure4_test.dart
+++ b/test/codegen/corelib/uri_base_test.dart
@@ -4,17 +4,12 @@
 
 import "package:expect/expect.dart";
 
-// Dart2js failed when a declared function was captured inside itself.
-
-foo(f) => f(499);
-
 main() {
-  fun(x) {
-    if (x < 3) {
-      return foo((x) => fun(x));
-    } else {
-      return x;
-    }
+  try {
+    Uri base = Uri.base;
+    Expect.isTrue(Uri.base.scheme == "file" || Uri.base.scheme == "http");
+  } on UnsupportedError catch (e) {
+    Expect.isTrue(
+        e.toString().contains("'Uri.base' is not supported"));
   }
-  Expect.equals(499, fun(499));
 }