Junit:如何测试从属性文件读取属性的方法 [英] Junit: How to test a method that read properties from a property file
问题描述
我有一个类ReadProperty
,该类具有返回类型Myclass
的方法ReadPropertyFile
,该方法从属性文件中读取参数值并返回Myclass
对象.我需要帮助来使用JUnit
测试ReadPropertyFile
方法,如果可能的话,可以使用模拟文件和模拟对象.
Hi I have a class ReadProperty
which has a method ReadPropertyFile
of return type Myclass
which read the parameter values from a property file and return Myclass
object. I need help to test the ReadPropertyFile
method with JUnit
, if possible with mock files and mock object.
这是我的代码.
import java.io.FileInputStream;
import java.util.Properties;
public class ReadProperty {
public Myclass ReadPropertyFile(String fileName) {
Myclass myclass = null;
String testparam = null;
FileInputStream fis = null;
Properties prop = new Properties();
try {
fis = new FileInputStream(fileName);
try {
prop.load(fis);
System.out.println("Load Property file : Success !");
} catch (Exception ex) {
System.out.println("Load Property file : Exception : " + ex.toString());
}
/*
* loading the properties
*/
try {
testparam = prop.getProperty("testparam");
System.out.println("testparam Type : " + testparam);
} catch (Exception ex) {
System.out.println("testparam Type : " + ex.toString());
}
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("Property file read fail : " + ex.toString());
System.exit(1);
}
Myclass = new Myclass(testparam);
return Myclass;
} }
推荐答案
我认为您真的不需要在这里嘲笑任何东西.您想测试属性读取器是否能够按预期访问和读取文件,因此请进行准确测试.对于常规属性,它可以像这样:
I don't think that you really need to mock anything here. You want to test if your property reader is able to access and read a file as you expect, so test exactly that. For regular properties it can go like this:
@Test
public void shouldReadPropFileFromSingleString() {
final Properties p = PropertiesLoader
.loadProperties("propfile");
assertNotNull(p);
assertFalse(p.isEmpty());
for (final Entry<Object, Object> e : p.entrySet()) {
assertEquals(expectedProperties.get(e.getKey()), e.getValue());
}
}
对于您的情况,可以对其进行调整:
For your case, you can adapt it:
@Test
public void shouldReadCorrectProp() {
final MyClass p = ReadProperty
.readPropertyFile("propfile");
assertNotNull(p);
assertEquals(expectedProperty, p);
}
您可能还想测试悲伤的路径-如果找不到属性文件,是否有任何后备属性等会发生什么情况.
You may also want to test the sad path - what happens if the property file is not found, are any fallback properties available etc.
顺便说一句,我建议更改方法名称,因为读取属性文件不是方法的主要问题-检索属性是.更好的是,将该方法分解为getProperty
和readPropertyFile
方法,其中第一个方法调用第二个方法.因此,根据关注的问题
BTW, I would advise changing the method name, since reading a property file is not the primary concern of your method - retrieving a property is. Better yet, decompose the method into a getProperty
and a readPropertyFile
method, where the first method calls the second. So you will have a cleaner design according to Separaton of Concerns
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