else单元测试中未采用的路径 [英] else path not taken in unit testing

问题描述

我正在研究角度6

我的下面的代码中没有任何其他语句.但是由于未采用else路径，所以我无法覆盖分支.在这种情况下，我需要做些什么才能获得100％的分支覆盖率?

I don't have any else statement in my below code.But I am unable to cover branches due to else path not taken .What I need to do to get 100% branch coverage in this case?

 getHeaderDocumentList(documents: any) {
            if (documents) {
                documents.result.docAttachment.forEach(element => {
                    this.headerdocumentdetails.push(element.DocumentUniqueID);
                });
            }
        }

推荐答案

为了获得完整的报道，代码最终需要命中(此处不是明确存在的)else-路径.为此，传入一个像0 | false | undefined | null | NaN | '' | "" | ``这样的falsy参数，如

In order to get full coverage reported, the code needs to eventually hit the (here non-explicitly-existent) else-path. For that matter pass in a falsy parameter like 0 | false | undefined | null | NaN | '' | "" | `` as in

component.getHeaderDocumentList(false);
expect(false).toEqual(false); // This line is optional. Most test suites require some kind of assertion in each test.

现在，您的测试套件应报告两个分支均已覆盖.

Now your test-suite should report both branches as covered.

最后的解决方案是在if情况之前添加/* istanbul ignore else */.这将告诉报道报道记者有效地忽略其他路径

Last solution would be to add /* istanbul ignore else */ in before the if case. That will tell the coverage reporter to effectively ignore the else path

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