fix #620, infer the input files from sources

test/codegen_expected/async_helper/async_helper.js

Index: test/codegen_expected/async_helper/async_helper.js
diff --git a/test/codegen_expected/async_helper/async_helper.js b/test/codegen_expected/async_helper/async_helper.js
deleted file mode 100644
index cb018a89fa0d76fc03d647207ce8c059b0d80458..0000000000000000000000000000000000000000
--- a/test/codegen_expected/async_helper/async_helper.js
+++ /dev/null
@@ -1,76 +0,0 @@
-dart_library.library('async_helper', null, /* Imports */[
-  'dart_sdk'
-], function load__async_helper(exports, dart_sdk) {
-  'use strict';
-  const core = dart_sdk.core;
-  const dart = dart_sdk.dart;
-  const dartx = dart_sdk.dartx;
-  const async_helper = Object.create(null);
-  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.functionType(dart.dynamic, [])))();
-  let StringToException = () => (StringToException = dart.constFn(dart.definiteFunctionType(core.Exception, [core.String])))();
-  let _Action0Tovoid = () => (_Action0Tovoid = dart.constFn(dart.definiteFunctionType(dart.void, [async_helper._Action0])))();
-  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
-  let dynamicTovoid = () => (dynamicTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [dart.dynamic])))();
-  let FnTovoid = () => (FnTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [VoidTodynamic()])))();
-  async_helper._initialized = false;
-  async_helper._Action0 = dart.typedef('_Action0', () => dart.functionType(dart.void, []));
-  async_helper._onAsyncEnd = null;
-  async_helper._asyncLevel = 0;
-  async_helper._buildException = function(msg) {
-    return core.Exception.new(dart.str`Fatal: ${msg}. This is most likely a bug in your test.`);
-  };
-  dart.fn(async_helper._buildException, StringToException());
-  async_helper.asyncTestInitialize = function(callback) {
-    async_helper._asyncLevel = 0;
-    async_helper._initialized = false;
-    async_helper._onAsyncEnd = callback;
-  };
-  dart.fn(async_helper.asyncTestInitialize, _Action0Tovoid());
-  dart.copyProperties(async_helper, {
-    get asyncTestStarted() {
-      return async_helper._initialized;
-    }
-  });
-  async_helper.asyncStart = function() {
-    if (dart.test(async_helper._initialized) && async_helper._asyncLevel == 0) {
-      dart.throw(async_helper._buildException('asyncStart() was called even though we are done ' + 'with testing.'));
-    }
-    if (!dart.test(async_helper._initialized)) {
-      if (async_helper._onAsyncEnd == null) {
-        dart.throw(async_helper._buildException('asyncStart() was called before asyncTestInitialize()'));
-      }
-      core.print('unittest-suite-wait-for-done');
-      async_helper._initialized = true;
-    }
-    async_helper._asyncLevel = dart.notNull(async_helper._asyncLevel) + 1;
-  };
-  dart.fn(async_helper.asyncStart, VoidTovoid());
-  async_helper.asyncEnd = function() {
-    if (dart.notNull(async_helper._asyncLevel) <= 0) {
-      if (!dart.test(async_helper._initialized)) {
-        dart.throw(async_helper._buildException('asyncEnd() was called before asyncStart().'));
-      } else {
-        dart.throw(async_helper._buildException('asyncEnd() was called more often than ' + 'asyncStart().'));
-      }
-    }
-    async_helper._asyncLevel = dart.notNull(async_helper._asyncLevel) - 1;
-    if (async_helper._asyncLevel == 0) {
-      let callback = async_helper._onAsyncEnd;
-      async_helper._onAsyncEnd = null;
-      callback();
-      core.print('unittest-suite-success');
-    }
-  };
-  dart.fn(async_helper.asyncEnd, VoidTovoid());
-  async_helper.asyncSuccess = function(_) {
-    return async_helper.asyncEnd();
-  };
-  dart.fn(async_helper.asyncSuccess, dynamicTovoid());
-  async_helper.asyncTest = function(f) {
-    async_helper.asyncStart();
-    dart.dsend(f(), 'then', async_helper.asyncSuccess);
-  };
-  dart.fn(async_helper.asyncTest, FnTovoid());
-  // Exports:
-  exports.async_helper = async_helper;
-});