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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Creates wrappers for callbacks and calls testDone() when all callbacks
* have been invoked.
* @param {testing.Test} fixture
*/
function CallbackHelper(fixture) {
/** @type {Object} fixture */
this.fixture_ = fixture;
/** @type {number} */
this.pendingCallbacks_ = 0;
}
CallbackHelper.prototype = {
/**
* @param {Function=} opt_callback
* @return {Function}
*/
wrap: function(opt_callback) {
var callback = opt_callback || function() {};
var savedArgs = new SaveMockArguments();
var lastCall = null;
var completionAction = callFunctionWithSavedArgs(savedArgs, function() {
if (lastCall) {
throw new Error('Called more than once, first call here: ' + lastCall);
} else {
lastCall = new Error().stack;
}
callback.apply(this.fixture_, arguments);
if (--this.pendingCallbacks_ <= 0)
testDone();
}.bind(this));
// runAllActionsAsync catches exceptions and puts them in the test
// framework's list of errors and fails the test.
var runAll = runAllActionsAsync(WhenTestDone.ASSERT, completionAction);
++this.pendingCallbacks_;
return function() {
savedArgs.arguments = Array.prototype.slice.call(arguments);
runAll.invoke();
}
}
};
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