{"id":709,"date":"2012-11-11T19:47:51","date_gmt":"2012-11-11T19:47:51","guid":{"rendered":"http:\/\/ilias-laptop\/examples\/core-java\/junit\/junit-rules-example\/"},"modified":"2019-03-21T12:55:49","modified_gmt":"2019-03-21T10:55:49","slug":"junit-rules-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/junit\/junit-rules-example\/","title":{"rendered":"JUnit Rules Example"},"content":{"rendered":"

The implementation of a Rule might look like this:<\/p>\n

import org.junit.rules.TestRule;\nimport org.junit.runner.Description;\nimport org.junit.runners.model.Statement;\n \npublic class LoggingRule implements TestRule {\n \n public class LoggingStatement extends Statement {\n \n  private final Statement statement;\n \n  public LoggingStatement(Statement aStatement, String aName) {\n   statement = aStatement;\n  }\n \n  @Override\n  public void evaluate() throws Throwable {\n   System.out.println(\"before: \" + name);\n   statement.evaluate();\n   System.out.println(\"after: \" + name);\n  }\n \n }\n \n private final String name;\n \n public LoggingRule(String aName) {\n  name = aName;\n }\n \n @Override\n public Statement apply(Statement statement, Description description) {\n  System.out.println(\"apply: \" + name);\n \n  return new LoggingStatement(statement, name);\n }\n \n}\n<\/pre>\n
A test class using this Rule might look like this:
 
<\/div> <\/div><\/p>\n
import org.junit.ClassRule;\nimport org.junit.Rule;\nimport org.junit.Test;\n \npublic class RuleTest {\n \n @ClassRule\n public static LoggingRule classRule = new LoggingRule(\"classrule\");\n \n @Rule\n public static LoggingRule rule = new LoggingRule(\"rule\");\n \n @Test\n public void testSomething() {\n  System.out.println(\"In TestSomething\");\n  assertTrue(true);\n }\n \n @Test\n public void testSomethingElse() {\n  System.out.println(\"In TestSomethingElse\");\n  assertTrue(true);\n }\n}\n<\/pre>\n
Output:<\/b><\/p>\n
apply: classrule\nbefore: classrule\napply: rule\nbefore: rule\nIn TestSomething\nafter: rule\napply: rule\nbefore: rule\nIn TestSomethingElse\nafter: rule\nafter: classrule<\/code>\n<\/pre>\n
Related Article:<\/b><\/p>\n