如何编写具有无效返回类型的函数的单元测试 [英] How do i write unit test for function with void return type

问题描述

我是编写单元测试的新手.我看到了几个jUnit的示例，但是它们都是用于返回值的函数的.

I am new to writing Unit tests. I saw few examples of jUnit , but they all were for functions returning a value.

我必须为以下方法编写单元测试.另外，我们在此方法中使用的对象和方法不属于此类，例如ConfigParser和ParseConfig.我该如何为这种方法编写单元测试?

I have to write unit test for following method. Also we are using objects and methods in this method not belonging to this class like ConfigParser and ParseConfig. How do i go about writing Unit tests for such menthods?

    @RequestMapping(value = "/generate-json" , consumes = MediaType.APPLICATION_JSON_VALUE, method = RequestMethod.POST)
@PageType(pageType = "PlaceHolderPageType")
public void execute(@RequestBody String payload) throws JSONException {
    JSONObject json = new JSONObject(payload);
    JSONObject configJSON = generateJSONSchema(json.toString());
    String capabilityName = (String) configJSON.get(JSONConfigurationConstants.CAPABILITY_NAME);
    String fileLocation = FormInputFieldConstants.JSON_PATH + capabilityName + JSONConfigurationConstants.FILE_EXTENSION;
    //Write JSON file
    try (OutputStreamWriter file  = new OutputStreamWriter(new FileOutputStream(fileLocation), StandardCharsets.UTF_8)) {
        file.write(configJSON.toString());
        file.flush();
        file.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    URI uriSchemaLocation = new File(fileLocation).toURI();
    ConfigParser configParser = new ConfigParser(uriSchemaLocation);
    configParser.parseConfig(TestHelper.getMockedJSONObject(fileLocation));
}

推荐答案

这是您要测试的方法，对吗?我很惊讶地看到它包含测试代码(configParser.parseConfig(TestHelper.getMockedJSONObject(fileLocation));)...

This is the method that you intend to test, correct? I am surprised to see that it contains test code (configParser.parseConfig(TestHelper.getMockedJSONObject(fileLocation));)...

您到底想测试什么?

• 例如，您可以通过加载文件来验证要写入的文件的内容.但是，这仅占方法逻辑的一部分.

• You could for example verify the content of the file that gets written by loading that file. However, that accounts only for a part of the method logic.

我没有看到任何@Override批注，因此假定您没有覆盖方法.您可以更改方法签名以返回已解析的配置，并使用断言对其进行检查.

I don't see any @Override annotation and therefore assume that you are not overriding a method. You could change the method signature to return the parsed config and check it with assertions.

可能还有其他方法可以检索配置；例如，这取决于configParser.parseConfig(...)的逻辑.

There might be other ways to retrieve the configuration; this depends on the logic of configParser.parseConfig(...).

您还可以考虑将最后的树行提取到另一种方法并测试该方法.

You could also consider extracting the last tree lines to another method and test that method.

总而言之，您可以更改方法以返回结果，也可以提取块以拥有自己的方法并进行测试，或者从其他来源检索结果(如果存在类似configParser.getParsedConfig()的情况).

To sum up, you can either change the method to return a result, or extract chunks to own methods and test these, or retrieve the result from another source (in case something like configParser.getParsedConfig() exists).

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