Check in codegen test expectations.

test/codegen/expect/lib/math/random_big_test.js

Index: test/codegen/expect/lib/math/random_big_test.js
diff --git a/test/codegen/expect/lib/math/random_big_test.js b/test/codegen/expect/lib/math/random_big_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e5f6d7e1a442e25caae1a54cab9c8eeea552c7d3
--- /dev/null
+++ b/test/codegen/expect/lib/math/random_big_test.js
@@ -0,0 +1,26 @@
+dart_library.library('lib/math/random_big_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__random_big_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const math = dart_sdk.math;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const random_big_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  random_big_test.main = function() {
+    let results = [];
+    for (let i = 60; i < 80; i++) {
+      let rng = math.Random.new((1)[dartx['<<']](i));
+      let val = rng.nextInt(100000);
+      core.print(dart.str`${i}: ${val}`);
+      expect$.Expect.isFalse(results[dartx.contains](val));
+      results[dartx.add](val);
+    }
+  };
+  dart.fn(random_big_test.main, VoidTodynamic());
+  // Exports:
+  exports.random_big_test = random_big_test;
+});