java如何模拟加载属性文件的服务？

Question

我没有很多模拟测试的经验

我编写了一个从属性文件加载代码的服务。这个很好用。现在我想为这个服务编写单元测试，但不知怎么的，它不起作用了，出了什么问题以及如何修复它？下面是我的服务类+单元测试类和属性文件

public class PhoneCodeService {

private static final Logger LOG = LoggerFactory.getLogger(PhoneCodeService.class);
private static final String PROPERTY_FILE_NAME = "phone-code.properties";
private final Map<String, String> phoneCodes;
private final Properties properties = new Properties();

/**
 * Default constructor
 */
public PhoneCodeService() {
    try {
        readPhoneCodesFromPropertyFile();
    } catch (IOException e) {
        LOG.debug("Could not read property file " + PROPERTY_FILE_NAME);
    }
      Map<String, String> map = new HashMap<String, String>();
        for (String key : properties.stringPropertyNames()) {
            map.put(key, properties.getProperty(key));
        }
        phoneCodes = map;
    }


public String getPhonecode(final String input) {
        String code = phoneCodes.get(input);
        return code;
}

private void readPhoneCodesFromPropertyFile() throws IOException {
    InputStream inputStream = null;
    try {
        inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(PROPERTY_FILE_NAME);
        if (inputStream == null) {
            throw new FileNotFoundException("property file is missing");
        }
        properties.load(inputStream);
    } finally {
        IOUtils.closeQuietly(inputStream);
    }
}

}

单元测试类

public class PhoneCodeServiceTest {

@Mock
private PhoneCodeService phoneCodeService;

@Before
public void setUp() {
    initMocks(this);
    when(phoneCodeService.getPhonecode("86101")).thenReturn("984");
}

@Test
public void testNull() {
    assertEquals(null, phoneCodeService.getPhonecode(null));
}

@Test
public void testCodes() {
    final String[] CODES = {"86101"};
    for (String code : CODES) {
        assertEquals("984", phoneCodeService.getPhonecode(code));
    }
}

}

我的属性文件示例

000=1
001=2
002=3
003=4
004=5

Answer 1

我有点惊讶。从你的代码来看，你更像是在测试模拟框架，而不是你的代码。代码中没有任何内容被执行

在这种情况下，更传统的测试方法将更有益

创建一个名为phone code的测试资源文件。包含测试值的属性 在测试期间，该文件必须在类路径中可用

测试PhoneCodeService而不去模仿它

然后按照以下步骤进行测试：

public class PhoneCodeServiceTest {

@Test
public void testNull() {
    PhoneCodeService phoneCodeService = new PhoneCodeService();
    assertEquals(null, phoneCodeService.getPhonecode(null));
}

@Test
public void testCodes() {
    PhoneCodeService phoneCodeService = new PhoneCodeService();
    final String[] CODES = {"86101"};
    for (String code : CODES) {
        assertEquals("984", phoneCodeService.getPhonecode(code));
    }
}

为了实现100%的代码覆盖率，您的类需要一种方法来向PhoneCodeService提供一个不存在的文件