Junit testing

[rick pine]

can i get some guidance with Junit testing. I need to create a junit test for this class, but i cant quite figure things out. Been at it for a few hours and cant get one test right. well, except for the blank ones.

package gpsWithUnitTests;

public class GpsCoordinates {

	private double lattitude;
	private double longitude;
	
	public GpsCoordinates(double lattitude, double longitude) {
		this.lattitude = lattitude;
		this.longitude = longitude;
	}
	
	public double getLattitude() {
		return lattitude;
	}
	
	public void setLattitude(double lat) {
		this.lattitude = lat;
	}
	
	public double getLongitude() {
		return longitude;
	}
	public void setLongitude(double lon) {
		this.longitude = lon;
	}
	@Override
	public String toString() {
		return String.format("%.6f, %.6f", lattitude, longitude);
				
		
	}
}

here is what i have, and that test its coming out incorrect

mport static org.junit.Assert.*;

import org.junit.Test;

public class GpsCoordinatesTest {
	GpsCoordinates tester = new GpsCoordinates(10.0, 10.1);

	
	@Test
	public void testGetLattitude() {
		double expected = 10.0;
		double lattitude = tester.getLattitude();
		assertEquals(expected, lattitude);
	}

	@Test
	public void testSetLattitude() {
		
		
		
	}
	@Test
	public void testGetLongitude() {
		GpsCoordinates tester = new GpsCoordinates(10.1, 11.2);
		double longitude = tester.getLongitude();
		assertEquals("11.2", String.valueOf(longitude));
		
	}

	@Test
	public void testSetLongitude() {
		
	}

	@Test
	public void testToString() {
		
	}

}

[rick pine]

please ignore method on line 23 forgot to delete it. I dont like that approach because im comparing string literals.

[Jeanne Boyarsky]

Rick,
I have two pieces of advice. First is that you don't need to have a test method for every method in the class. They can share. For example, you can test getLatitude and getLongitude in the same test. If you even need the setter. Often when a constructor takes parameters, the object is immutable and you don't need the setter.

The toString() method is a good one to test. You know what the expected value should be for a given longitude and latitude so your test can assert that is the case.