How to run JUnit in Eclipse

What is JUnit

Prerequisites

ProjectA  ----  src
                 |
                 ------ xx.yy.zzz(package)
                            |
                            ------- Door.java (Tested class)

Configuration

Create a class "DoorTest.java" for testing Door.java (test target class) under package xx.yy.zzz.

image.png

image.png

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DoorTest.java


package xx.yy.zzz;  //Make it the same package as the class under test

import static org.junit.Assert.*;

import org.junit.Test;

public class DoorTest {

	@Test
	public void test() {
		fail("Not yet implemented");
	}

}

image.png

image.png

Write a test program

Tested class

Door.java


package xx.yy.zzz;  //Make it the same package as the test class

public class Door {
	private boolean isOpen = false;

	public void open(String str) {
		if (str.equals("open Sesame!")) {
			isOpen = true;
		} else {
                        isOpen = false;
			System.out.println("wrong.");
		}
	}

	public void close() {
		isOpen = false;
	}

	// getter
	public boolean isOpen() {
		return isOpen;
	}

}

Test content

Test class

Door.java


package xx.yy.zzz;  //Make it the same package as the class under test

import static org.junit.Assert.*;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class DoorTest {

	Door door;
    private ByteArrayOutputStream baos;

	//Preprocessing
	@Before
	public void setUp() {
		door = new Door();

        baos = new ByteArrayOutputStream();
        System.setOut(
            new PrintStream(
                new BufferedOutputStream(baos)
            )
        );
	}


	// 「@"Test" is an annotation for JUnit to recognize as a test method.
	//Create with public void
	@Test
	public void test1() {
		door.open("Please open the door");

		//Standard output
		System.out.flush();
		String expected = "wrong.\r\n";
        String actual = baos.toString();

        //Confirmation with expected value
		assertEquals(false, door.isOpen());
        assertEquals(expected, actual);
	}

	@Test
	public void test2() {
		door.open("open Sesame!");
		assertEquals(true, door.isOpen());
	}

	@Test
	public void test3() {
		door.close();
		assertEquals(false, door.isOpen());
	}

	//Post-processing
	@After
	public void fin() {
		// DO Nothing
	}

}

[Supplement]

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