Check in codegen test expectations.

test/codegen/expect/language/type_propagation_test.js

Index: test/codegen/expect/language/type_propagation_test.js
diff --git a/test/codegen/expect/language/type_propagation_test.js b/test/codegen/expect/language/type_propagation_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..eca47b97d9dad4d4f79aa0a0e8e16c57620d41de
--- /dev/null
+++ b/test/codegen/expect/language/type_propagation_test.js
@@ -0,0 +1,55 @@
+dart_library.library('language/type_propagation_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__type_propagation_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const type_propagation_test = Object.create(null);
+  let JSArrayOfB = () => (JSArrayOfB = dart.constFn(_interceptors.JSArray$(type_propagation_test.B)))();
+  let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  type_propagation_test.A = class A extends core.Object {
+    resolveSend(node) {
+      if (node == null) {
+        return JSArrayOfB().of([new type_propagation_test.B()])[dartx.get](0);
+      } else {
+        return JSArrayOfObject().of([new type_propagation_test.B(), new type_propagation_test.A()])[dartx.get](1);
+      }
+    }
+    visitSend(node) {
+      let target = this.resolveSend(node);
+      if (false) {
+        if (false) {
+          target = dart.dload(target, 'getter');
+          if (false) {
+            target = new core.Object();
+          }
+        }
+      }
+      return true ? target : null;
+    }
+  };
+  dart.setSignature(type_propagation_test.A, {
+    methods: () => ({
+      resolveSend: dart.definiteFunctionType(dart.dynamic, [dart.dynamic]),
+      visitSend: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])
+    })
+  });
+  type_propagation_test.a = 43;
+  type_propagation_test.B = class B extends core.Object {
+    new() {
+      this.getter = type_propagation_test.a == 42 ? new type_propagation_test.A() : null;
+    }
+  };
+  type_propagation_test.main = function() {
+    expect$.Expect.isTrue(type_propagation_test.A.is(new type_propagation_test.A().visitSend(new type_propagation_test.A())));
+    expect$.Expect.isTrue(type_propagation_test.B.is(new type_propagation_test.A().visitSend(null)));
+  };
+  dart.fn(type_propagation_test.main, VoidTodynamic());
+  // Exports:
+  exports.type_propagation_test = type_propagation_test;
+});