How to use testing framework

It's a lot like what you'd expect from other Java testing frameworks. At least the test writing part is.

Writing a test class

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I like to start with a very minimal stub for the class to be tested.

package org.example.exercises.arithmetic;

public class Percentage {
    
    private final int number;
    
    public Percentage(int n) {
        this.number = n;
    }

}

The skeleton for the test class

package org.example.exercises.arithmetic;

import testframe.api.Test;

public class PercentageTest {

}

This is sufficient to get started writing tests. For example,

package org.example.exercises.arithmetic;

import testframe.api.Test;

public class PercentageTest {

    @Test
    public void testToString() {
        int n = (int) Math.round(Math.random() * 100);
        Percentage percentage = new Percentage(n);
        String expected = n + ".0%";
        String actual = percentage.toString();
        assert expected.equals(actual);
    }
    
}

If you run this, as explained in the next section, the output won't be very informative.

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Running a test class

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