Check in codegen test expectations.

test/codegen/expect/corelib/uri_base_test.js

Index: test/codegen/expect/corelib/uri_base_test.js
diff --git a/test/codegen/expect/corelib/uri_base_test.js b/test/codegen/expect/corelib/uri_base_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f4bd3debd16ba4ac59d46fa55a1d01f302742582
--- /dev/null
+++ b/test/codegen/expect/corelib/uri_base_test.js
@@ -0,0 +1,27 @@
+dart_library.library('corelib/uri_base_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__uri_base_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const uri_base_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  uri_base_test.main = function() {
+    try {
+      let base = core.Uri.base;
+      expect$.Expect.isTrue(core.Uri.base.scheme == "file" || core.Uri.base.scheme == "http");
+    } catch (e) {
+      if (core.UnsupportedError.is(e)) {
+        expect$.Expect.isTrue(dart.toString(e)[dartx.contains]("'Uri.base' is not supported"));
+      } else
+        throw e;
+    }
+
+  };
+  dart.fn(uri_base_test.main, VoidTodynamic());
+  // Exports:
+  exports.uri_base_test = uri_base_test;
+});