Check in codegen test expectations.

test/codegen/expect/language/type_argument_substitution_test.js

Index: test/codegen/expect/language/type_argument_substitution_test.js
diff --git a/test/codegen/expect/language/type_argument_substitution_test.js b/test/codegen/expect/language/type_argument_substitution_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..fd8d8f0348ad94477ae92b335a1d9f1bd0bb2967
--- /dev/null
+++ b/test/codegen/expect/language/type_argument_substitution_test.js
@@ -0,0 +1,39 @@
+dart_library.library('language/type_argument_substitution_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__type_argument_substitution_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 type_argument_substitution_test = Object.create(null);
+  let A = () => (A = dart.constFn(type_argument_substitution_test.A$()))();
+  let X = () => (X = dart.constFn(type_argument_substitution_test.X$()))();
+  let XOfB = () => (XOfB = dart.constFn(type_argument_substitution_test.X$(type_argument_substitution_test.B)))();
+  let AOfString = () => (AOfString = dart.constFn(type_argument_substitution_test.A$(core.String)))();
+  let XOfAOfString = () => (XOfAOfString = dart.constFn(type_argument_substitution_test.X$(AOfString())))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  type_argument_substitution_test.K = class K extends core.Object {};
+  type_argument_substitution_test.A$ = dart.generic(T => {
+    class A extends core.Object {}
+    dart.addTypeTests(A);
+    return A;
+  });
+  type_argument_substitution_test.A = A();
+  type_argument_substitution_test.B = class B extends type_argument_substitution_test.A$(type_argument_substitution_test.K) {};
+  dart.addSimpleTypeTests(type_argument_substitution_test.B);
+  type_argument_substitution_test.X$ = dart.generic(T => {
+    class X extends core.Object {}
+    dart.addTypeTests(X);
+    return X;
+  });
+  type_argument_substitution_test.X = X();
+  type_argument_substitution_test.main = function() {
+    let v = new core.DateTime.now().millisecondsSinceEpoch != 42 ? new (XOfB())() : new (XOfAOfString())();
+    expect$.Expect.isFalse(XOfAOfString().is(v));
+  };
+  dart.fn(type_argument_substitution_test.main, VoidTodynamic());
+  // Exports:
+  exports.type_argument_substitution_test = type_argument_substitution_test;
+});