node.js mocha 中的全局泄漏错误
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global leak errors in mocha
提问by MonkeyBonkey
I was trying to unit test the apple push notification librarywhen I got a global leak error trying to open up an APN connection.
当我在尝试打开 APN 连接时遇到全局泄漏错误时，我试图对苹果推送通知库进行单元测试。
Is that a configuration error on my part or an error in node-apn or mocha?
这是我的配置错误还是 node-apn 或 mocha 中的错误？
I'm not sure I understand what checkGlobals is doing... is it just checking to see if any global variable are being set?
我不确定我是否理解 checkGlobals 正在做什么......它只是检查是否正在设置任何全局变量？
0) Feed "before all" hook:
Error: global leak detected: hasCert
at Runner.checkGlobals (/usr/lib/node_modules/mocha/lib/runner.js:96:21)
at Runner.<anonymous> (/usr/lib/node_modules/mocha/lib/runner.js:41:44)
at Runner.emit (events.js:64:17)
at /usr/lib/node_modules/mocha/lib/runner.js:159:12
at Hook.run (/usr/lib/node_modules/mocha/lib/runnable.js:114:5)
at next (/usr/lib/node_modules/mocha/lib/runner.js:157:10)
at Array.<anonymous> (/usr/lib/node_modules/mocha/lib/runner.js:165:5)
at EventEmitter._tickCallback (node.js:126:26)
回答by ento
Yes, Mocha features a global leak detection mechanism which alerts and fails if your code under test introduces global variables.
是的，Mocha 具有全局泄漏检测机制，如果您的被测代码引入全局变量，该机制会发出警报并失败。
If hasCertis declared in a library and you have no control over its creation, you can tell Mocha to ignore it.
如果hasCert在库中声明并且您无法控制其创建，则可以告诉 Mocha 忽略它。
On the command line,
在命令行上，
$ mocha --globals hasCert
To quote the documentation:
引用文档：
[This option] accepts a comma-delimited list of accepted global variable names. For example suppose your app deliberately exposes a global named app and YUI, you may want to add --globals app,YUI.
[此选项] 接受以逗号分隔的已接受全局变量名称列表。例如，假设您的应用程序故意公开一个全局命名的应用程序和 YUI，您可能需要添加 --globals app,YUI。
In a browser:
在浏览器中：
mocha.setup({globals: ['hasCert']});
回答by Jimchao
You can also disable global leak detection by passing:
您还可以通过以下方式禁用全局泄漏检测：
mocha --ignore-leaks
In a browser:
在浏览器中：
mocha.setup({ignoreLeaks: true});
回答by Dominic Barnes
I ran into this problem as well, you probably forgot a varstatement somewhere like I did, which in JS means that a global variable will be created.
我也遇到了这个问题，你可能var像我一样忘记了某处的声明，这在 JS 中意味着将创建一个全局变量。
You may have to hunt it down yourself depending on how you structured your app, and hopefully it's not a 3rd-party bit of code that's causing this. :P
根据您构建应用程序的方式，您可能必须自己寻找它，希望这不是导致这种情况的第 3 方代码。:P
You should use JSLintor JSHintthrough your project, they should help uncover the source if it's anywhere in your code.
回答by Gudlaugur Egilsson
This can also happen if you forget newin a call to a constructor. In that case, thisis the global object so any properties introduced in the constructor will be added to the global object.
如果您忘记new调用构造函数，也会发生这种情况。在这种情况下，this是全局对象，因此构造函数中引入的任何属性都将添加到全局对象中。
That problem should not go undetected for long, but it's an interesting test failure.
这个问题应该不会长时间未被发现，但它是一个有趣的测试失败。
回答by muffs
I came across this answer when I trying to figure out how to squelch JSONP leaks such as:
当我试图弄清楚如何抑制 JSONP 泄漏时，我遇到了这个答案，例如：
Error: global leak detected: jQuery20305777117821853608_1388095882488
Squelch jQuery JSONP "leaks" via:
静噪 jQuery JSONP 通过以下方式“泄漏”：
mocha.setup({
globals: ['jQuery*']
});
回答by Saba Hassan
I was encountering this error for many functions as follows:
我在许多函数中遇到此错误，如下所示：
1) test "before all" hook:
Error: global leaks detected: __timers, _document, history, addEventListener, removeEventListener, dispatchEvent, raise, __stopAllTimers, Image, _virtualConsole, run, getGlobal, dispose, top, parent, self, frames, window, _frame, $, jQuery, Handlebars, Ember, Em, MetamorphENV, Cloud, jQuery1102048038746835663915, _listeners, _length, length, document, location, close, getComputedStyle, navigator, name, innerWidth, innerHeight, outerWidth, outerHeight, pageXOffset, pageYOffset, screenX, screenY, screenLeft, screenTop, scrollX, scrollY, scrollTop, scrollLeft, alert, blur, confirm, createPopup, focus, moveBy, moveTo, open, print, prompt, resizeBy, resizeTo, scroll, scrollBy, scrollTo, screen, mapper, mapDOMNodes, visitTree, markTreeReadonly, INDEX_SIZE_ERR, DOMSTRING_SIZE_ERR, HIERARCHY_REQUEST_ERR, WRONG_DOCUMENT_ERR, INVALID_CHARACTER_ERR, NO_DATA_ALLOWED_ERR, NO_MODIFICATION_ALLOWED_ERR, NOT_FOUND_ERR, NOT_SUPPORTED_ERR, INUSE_ATTRIBUTE_ERR, INVALID_STATE_ERR, SYNTAX_ERR, INVALID_MODIFICATION_ERR, NAMESPACE_ERR, INVALID_ACCESS_ERR, exceptionMessages, DOMException, NodeList, DOMImplementation, Node, NamedNodeMap, AttributeList, Element, DocumentFragment, Document, Attr, EventException, Event, UIEvent, MouseEvent, MutationEvent, EventTarget, languageProcessors, resourceLoader, HTMLCollection, HTMLOptionsCollection, HTMLDocument, HTMLElement, HTMLFormElement, HTMLLinkElement, HTMLMetaElement, HTMLHtmlElement, HTMLHeadElement, HTMLTitleElement, HTMLBaseElement, HTMLIsIndexElement, HTMLStyleElement, HTMLBodyElement, HTMLSelectElement, HTMLOptGroupElement, HTMLOptionElement, HTMLInputElement, HTMLTextAreaElement, HTMLButtonElement, HTMLLabelElement, HTMLFieldSetElement, HTMLLegendElement, HTMLUListElement, HTMLOListElement, HTMLDListElement, HTMLDirectoryElement, HTMLMenuElement, HTMLLIElement, HTMLCanvasElement, HTMLDivElement, HTMLParagraphElement, HTMLHeadingElement, HTMLQuoteElement, HTMLPreElement, HTMLBRElement, HTMLBaseFontElement, HTMLFontElement, HTMLHRElement, HTMLModElement, HTMLAnchorElement, HTMLImageElement, HTMLObjectElement, HTMLParamElement, HTMLAppletElement, HTMLMapElement, HTMLAreaElement, HTMLScriptElement, HTMLTableElement, HTMLTableCaptionElement, HTMLTableColElement, HTMLTableSectionElement, HTMLTableRowElement, HTMLTableCellElement, HTMLFrameSetElement, HTMLFrameElement, HTMLIFrameElement, StyleSheet, MediaList, CSSStyleSheet, CSSRule, CSSStyleRule, CSSMediaRule, CSSImportRule, CSSStyleDeclaration, StyleSheetList, VALIDATION_ERR, TYPE_MISMATCH_ERR, UserDataHandler, DOMError, DOMConfiguration, DOMStringList, XPathException, XPathExpression, XPathResult, XPathEvaluator, DocumentType, CharacterData, ProcessingInstruction, Comment, Text, NodeFilter, _parser, _parsingMode, _augmented
So I passed a wildcard in the setup function and it solved my issue.
所以我在 setup 函数中传递了一个通配符，它解决了我的问题。
mocha.setup({
globals: ['*']
});
回答by Ari Singh
I added "mocha.globals(['browserSync']);" below to fix my problem. The rest of the code is from https://mochajs.org/- section : RUNNING MOCHA IN THE BROWSER
我添加了“mocha.globals([' browserSync']);” 下面来解决我的问题。其余代码来自https://mochajs.org/- 部分：在浏览器中运行摩卡
<script>mocha.setup('bdd')</script>
<script src="basic-spec.js"></script>
<script>
mocha.checkLeaks();
mocha.globals(['jQuery']);
mocha.globals(['___browserSync___']); //<<== This line was added
mocha.run();
</script>
回答by jsduniya
Define Your stub variables before you use it.
在使用之前定义您的存根变量。
var hasCert;
var hasCert = sinon.stub(instance, method);
var hasCert;
var hasCert = sinon.stub(instance, method);
