What Happens If a JUnit Test Method Is Declared as "private"

Q

What Happens If a JUnit Test Method Is Declared as "private"?

✍: FYICenter.com QA Team

A

If a JUnit test method is declared as "private", the compilation will pass ok. But the execution will fail. This is decause JUnit requires that all test methods must be declared as "public". For example:

type HelloTestPrivate.java

import org.junit.Test;
import static org.junit.Assert.*;
// by FYICenter.com
public class HelloTestPrivate {
    @Test private void testHello() {
        String message = "Hello World!";
        assertEquals(12, message.length());
    }
}

javac -cp junit-4.4.jar HelloTestPrivate.java

java -cp .;junit-4.4.jar org.junit.runner.JUnitCore 
   HelloTestPrivate
JUnit version 4.4
.E
Time: 0
There was 1 failure:
1) initializationError0(HelloTestPrivate)
java.lang.Exception: Method testHello should be public
at org.junit.internal.runners.MethodValidator.validateTestMethod
at org.junit.internal.runners.MethodValidator.validateInstanceMe
at org.junit.internal.runners.MethodValidator.validateMethodsFor
at org.junit.internal.runners.JUnit4ClassRunner.validate(JUnit4C
at org.junit.internal.runners.JUnit4ClassRunner.<init>(JUn
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeC
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Del
at java.lang.reflect.Constructor.newInstance(Constructor.java:51
at org.junit.internal.requests.ClassRequest.buildRunner(ClassReq
at org.junit.internal.requests.ClassRequest.getRunner(ClassReque
at org.junit.internal.requests.ClassesRequest.getRunner(ClassesR
at org.junit.runner.JUnitCore.run(JUnitCore.java:109)
at org.junit.runner.JUnitCore.run(JUnitCore.java:100)
at org.junit.runner.JUnitCore.runMain(JUnitCore.java:81)
at org.junit.runner.JUnitCore.main(JUnitCore.java:44)

FAILURES!!!
Tests run: 1,  Failures: 1

2008-01-24, 4760👍, 0💬