Check in codegen test expectations.

test/codegen/expect/lib/html/range_test.js

Index: test/codegen/expect/lib/html/range_test.js
diff --git a/test/codegen/expect/lib/html/range_test.js b/test/codegen/expect/lib/html/range_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f4ded812ff63a1681b3439251d85bbfa73019918
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+++ b/test/codegen/expect/lib/html/range_test.js
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+dart_library.library('lib/html/range_test', null, /* Imports */[
+  'dart_sdk',
+  'unittest'
+], function load__range_test(exports, dart_sdk, unittest) {
+  'use strict';
+  const core = dart_sdk.core;
+  const html = dart_sdk.html;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const html_individual_config = unittest.html_individual_config;
+  const unittest$ = unittest.unittest;
+  const src__matcher__expect = unittest.src__matcher__expect;
+  const src__matcher__core_matchers = unittest.src__matcher__core_matchers;
+  const src__matcher__throws_matcher = unittest.src__matcher__throws_matcher;
+  const range_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  range_test.main = function() {
+    html_individual_config.useHtmlIndividualConfiguration();
+    unittest$.group('supported', dart.fn(() => {
+      unittest$.test('supports_createContextualFragment', dart.fn(() => {
+        src__matcher__expect.expect(html.Range[dartx.supportsCreateContextualFragment], src__matcher__core_matchers.isTrue);
+      }, VoidTodynamic()));
+    }, VoidTovoid()));
+    unittest$.group('functional', dart.fn(() => {
+      unittest$.test('supported works', dart.fn(() => {
+        let range = html.Range.new();
+        range[dartx.selectNode](html.document[dartx.body]);
+        let expectation = dart.test(html.Range[dartx.supportsCreateContextualFragment]) ? src__matcher__core_matchers.returnsNormally : src__matcher__throws_matcher.throws;
+        src__matcher__expect.expect(dart.fn(() => {
+          range[dartx.createContextualFragment]('<div></div>');
+        }, VoidTodynamic()), expectation);
+      }, VoidTodynamic()));
+    }, VoidTovoid()));
+  };
+  dart.fn(range_test.main, VoidTodynamic());
+  // Exports:
+  exports.range_test = range_test;
+});