Check in codegen test expectations.

test/codegen/expect/corelib/string_operations_with_null_test.js

Index: test/codegen/expect/corelib/string_operations_with_null_test.js
diff --git a/test/codegen/expect/corelib/string_operations_with_null_test.js b/test/codegen/expect/corelib/string_operations_with_null_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f53108b02a89d19d0617c4f8fb03c9f58d2d3b97
--- /dev/null
+++ b/test/codegen/expect/corelib/string_operations_with_null_test.js
@@ -0,0 +1,27 @@
+dart_library.library('corelib/string_operations_with_null_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__string_operations_with_null_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 string_operations_with_null_test = Object.create(null);
+  let ListOfString = () => (ListOfString = dart.constFn(core.List$(core.String)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let VoidToString = () => (VoidToString = dart.constFn(dart.definiteFunctionType(core.String, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidToListOfString = () => (VoidToListOfString = dart.constFn(dart.definiteFunctionType(ListOfString(), [])))();
+  string_operations_with_null_test.returnStringOrNull = function() {
+    return new core.DateTime.now().millisecondsSinceEpoch == 0 ? 'foo' : null;
+  };
+  dart.fn(string_operations_with_null_test.returnStringOrNull, VoidTodynamic());
+  string_operations_with_null_test.main = function() {
+    expect$.Expect.throws(dart.fn(() => 'foo' + dart.notNull(core.String._check(string_operations_with_null_test.returnStringOrNull())), VoidToString()), dart.fn(e => core.ArgumentError.is(e), dynamicTobool()));
+    expect$.Expect.throws(dart.fn(() => 'foo'[dartx.split](core.Pattern._check(string_operations_with_null_test.returnStringOrNull())), VoidToListOfString()), dart.fn(e => core.ArgumentError.is(e) || core.NoSuchMethodError.is(e), dynamicTobool()));
+  };
+  dart.fn(string_operations_with_null_test.main, VoidTodynamic());
+  // Exports:
+  exports.string_operations_with_null_test = string_operations_with_null_test;
+});