Check in codegen test expectations.

test/codegen/expect/language/null_is_test.js

Index: test/codegen/expect/language/null_is_test.js
diff --git a/test/codegen/expect/language/null_is_test.js b/test/codegen/expect/language/null_is_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..2aa52843f10ff0b5570294ff20b4b5c9a7368bd4
--- /dev/null
+++ b/test/codegen/expect/language/null_is_test.js
@@ -0,0 +1,52 @@
+dart_library.library('language/null_is_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__null_is_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 null_is_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  null_is_test.main = function() {
+    expect$.Expect.isTrue(core.Object.is(null));
+    expect$.Expect.isTrue(core.Null.is(null));
+    expect$.Expect.isFalse(typeof null == 'number');
+    expect$.Expect.isFalse(typeof null == 'boolean');
+    expect$.Expect.isFalse(typeof null == 'number');
+    expect$.Expect.isFalse(typeof null == 'string');
+    expect$.Expect.isFalse(core.List.is(null));
+    expect$.Expect.isFalse(expect$.Expect.is(null));
+    null_is_test.test(null);
+    expect$.Expect.isFalse(core.Null.is(1));
+    expect$.Expect.isFalse(core.Null.is("1"));
+    expect$.Expect.isFalse(core.Null.is(true));
+    expect$.Expect.isFalse(core.Null.is(false));
+    expect$.Expect.isFalse(core.Null.is(new core.Object()));
+    null_is_test.testNegative(1);
+    null_is_test.testNegative("1");
+    null_is_test.testNegative(true);
+    null_is_test.testNegative(false);
+    null_is_test.testNegative(new core.Object());
+  };
+  dart.fn(null_is_test.main, VoidTodynamic());
+  null_is_test.test = function(n) {
+    expect$.Expect.isTrue(core.Object.is(n));
+    expect$.Expect.isTrue(core.Null.is(n));
+    expect$.Expect.isFalse(typeof n == 'number');
+    expect$.Expect.isFalse(typeof n == 'boolean');
+    expect$.Expect.isFalse(typeof n == 'number');
+    expect$.Expect.isFalse(typeof n == 'string');
+    expect$.Expect.isFalse(core.List.is(n));
+    expect$.Expect.isFalse(expect$.Expect.is(n));
+  };
+  dart.fn(null_is_test.test, dynamicTodynamic());
+  null_is_test.testNegative = function(n) {
+    expect$.Expect.isFalse(core.Null.is(n));
+  };
+  dart.fn(null_is_test.testNegative, dynamicTodynamic());
+  // Exports:
+  exports.null_is_test = null_is_test;
+});