How to run all tests in junit

Question

I am trying to learn junit testing in eclipse and i have tried to start off with something simple. I wrote a basic program with 2 methods, an add and subtract method which both take 2 arguments. So I tried testing the add function only, with a test that looked like this

import static org.junit.Assert.*;
import org.junit.Test;

public class addtest {

    @Test
    public void testAdd() {
        class1 calc = new class1();
        int expected = 7;
        int actual = class1.add(3, 4);
        assertEquals("adding 3 and 4 ", expected, actual);
        expected = 15;
        actual = class1.add(5, 10);
        assertEquals("adding 5 and 10 ", expected, actual);
    }
}

and it was working as i wanted.

But then when i tried to implement the second test for subtraction, i noticed that it never seemed to test that section. I even tried having a second test method in case my subtraction method was incorrect. This is what i have for my latest test.

import static org.junit.Assert.*;
import org.junit.Test;

public class addtest {

    @Test
    public void testAdd() {
        class1 calc = new class1();
        int expected = 7;
        int actual = class1.add(3, 4);
        assertEquals("adding 3 and 4 ", expected, actual);
        expected = 15;
        actual = class1.add(5, 10);
        assertEquals("adding 5 and 10 ", expected, actual);
    }

    public void testMinus() {
        class1 calc = new class1();
        int expected = 0;
        int actual = class1.add(12, 4);
        assertEquals("subtracting 4 from 12", expected, actual);
    }

}

I noticed that the test testMinus never does anything, whether the assert is true of not. Is there something wrong with my implementation? I have tried running the source folder as a junit test already, nothing was fixed.

Thanks a lot for any help

EDIT: I tried commenting out the first test, so that my test function has only testMinus inside it, and now it is testing the second method. Is there a reason the program stops testing after going through the first method?

Answer 1

add @Test above your minusTest method also. It looks like

@Test
public void testMinus() {
    class1 calc = new class1();
    int expected = 0;
    int actual = class1.add(12, 4);
    assertEquals("subtracting 4 from 12", expected, actual);
}

Answer 2

`

@Test
public void testMinus() {
    class1 calc = new class1();
    int expected = 0;
    int actual = calc.add(12, 4); // Issue with current implementation, method should be called with instance of a class.
    assertEquals("subtracting 4 from 12", expected, actual);
}

`

All Junit tests should be annotated with with @Test.