how to load properties file in junit test cases

Junit is a widely used testing framework for testing Java applications. One of the common tasks when writing Junit test cases is to load properties files. In this article, we'll discuss how to load properties file in Junit test cases.

What is a properties file?

A properties file is a file that contains key-value pairs of configuration data. The key-value pairs are usually in the form of strings, with each pair on a separate line. Properties files are commonly used for storing configuration data required for setting up an application.

Loading properties files in Junit test cases

When writing Junit test cases, it is often necessary to load properties files to set up the test environment. Here are the steps to load a properties file in a Junit test case:

Step 1: Create a properties file

The first step is to create a properties file that contains the configuration data required for the test. The filename should have a .properties extension. The properties file should be placed in the classpath of the test case.

Step 2: Read the properties file

In the Junit test case, you need to read the properties file. One way to do this is by using the Properties class in Java. Here's an example code snippet that reads a properties file:```Properties props = new Properties();InputStream inputStream = getClass().getClassLoader().getResourceAsStream(\"test.properties\");props.load(inputStream);```

Step 3: Use the properties in the test case

Once the properties file is loaded, you can use the properties in your test case. Here's an example code snippet that uses the properties from the properties file:```@Testpublic void testExample() { Properties props = new Properties(); InputStream inputStream = getClass().getClassLoader().getResourceAsStream(\"test.properties\"); props.load(inputStream); String value = props.getProperty(\"example.property\"); // Assert the value of the property assertEquals(\"test\", value);}```

Conclusion

In this article, we discussed how to load properties files in Junit test cases. Loading properties files is an important task in setting up the test environment. By following the steps outlined in this article, you can easily load properties files in your Junit test cases and use the properties in your tests.