Check in codegen test expectations.

test/codegen/expect/language/check_method_override_test_none_multi.js

Index: test/codegen/expect/language/check_method_override_test_none_multi.js
diff --git a/test/codegen/expect/language/check_method_override_test_none_multi.js b/test/codegen/expect/language/check_method_override_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..3f9104b0e898c2109932a9000a4be9e92876ae63
--- /dev/null
+++ b/test/codegen/expect/language/check_method_override_test_none_multi.js
@@ -0,0 +1,33 @@
+dart_library.library('language/check_method_override_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__check_method_override_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const check_method_override_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  check_method_override_test_none_multi.A = class A extends core.Object {
+    f(x) {
+      if (x === void 0) x = null;
+    }
+    foo(a, x, y) {
+      if (x === void 0) x = null;
+      if (y === void 0) y = null;
+    }
+  };
+  dart.setSignature(check_method_override_test_none_multi.A, {
+    methods: () => ({
+      f: dart.definiteFunctionType(dart.dynamic, [], [dart.dynamic]),
+      foo: dart.definiteFunctionType(dart.dynamic, [dart.dynamic], [dart.dynamic, dart.dynamic])
+    })
+  });
+  check_method_override_test_none_multi.C = class C extends check_method_override_test_none_multi.A {};
+  check_method_override_test_none_multi.main = function() {
+    new check_method_override_test_none_multi.A().foo(2);
+    new check_method_override_test_none_multi.C().foo(1);
+  };
+  dart.fn(check_method_override_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.check_method_override_test_none_multi = check_method_override_test_none_multi;
+});