Testing / Junit Interview questions III
Junit: What is @Rule annotation?
@Rule annotation in Junit is used to create objects that later can be used with the test methods.
Junit @Rule annotation works on the principle of AOP (aspect oriented programming). It intercepts the test method thus providing an opportunity perform some action before or after the execution of a particular test method.
public class JunitRuleExampleTest { @Rule public TemporaryFolder tFolder = new TemporaryFolder(); @Test public void testRule() throws IOException { File txtFile = tFolder.newFile("sample.txt"); assertTrue(txtFile.exists()); } }
Every time the above test method is executed, a temporary folder is created and used in the test while executing and be deleted/garbage collected after the test run.
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