Check in codegen test expectations.

test/codegen/expect/language/issue15702_test.js

Index: test/codegen/expect/language/issue15702_test.js
diff --git a/test/codegen/expect/language/issue15702_test.js b/test/codegen/expect/language/issue15702_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..bf5a3d9d24df5e8158c934539d3fd366042b912b
--- /dev/null
+++ b/test/codegen/expect/language/issue15702_test.js
@@ -0,0 +1,27 @@
+dart_library.library('language/issue15702_test', null, /* Imports */[
+  'dart_sdk'
+], function load__issue15702_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const issue15702_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue15702_test.main = function() {
+    let stake = new issue15702_test.Amount(2.5);
+    if ((dart.notNull(stake.value) * 10)[dartx.toInt]() != 25) {
+      dart.throw('Test failed');
+    }
+  };
+  dart.fn(issue15702_test.main, VoidTodynamic());
+  issue15702_test.Amount = class Amount extends core.Object {
+    new(value) {
+      this.value = value;
+    }
+  };
+  dart.setSignature(issue15702_test.Amount, {
+    constructors: () => ({new: dart.definiteFunctionType(issue15702_test.Amount, [core.num])})
+  });
+  // Exports:
+  exports.issue15702_test = issue15702_test;
+});