package dannsa;

import static org.junit.Assert.*;

import org.junit.Test;

public class StudentGroupTestingClass {

    @Test
    public void testStudentGroup() {
        StudentGroup group = new StudentGroup(30);
        assertNotNull(group);
        assertEquals(30, group.getFreeSlots());
    }

    @Test
    public void testAddStudent() {
        StudentGroup group1 = new StudentGroup(2);
        assertNotNull(group1);
        assertEquals(2, group1.getFreeSlots());

        Student stud1 = new Student();
        assertNotNull(stud1);
        assertTrue(group1.addStudent(stud1));
        assertEquals(1, group1.getFreeSlots());

        //cannot add the same student
        assertFalse(group1.addStudent(stud1));

        Student stud2 = new Student();
        assertNotNull(stud2);
        assertTrue(group1.addStudent(stud2));
        assertEquals(0, group1.getFreeSlots());

        Student stud3 = new Student();
        assertNotNull(stud3);
        assertFalse(group1.addStudent(stud3));
    }

    @Test
    public void testRemove() {
        StudentGroup group2 = new StudentGroup(3);
        assertNotNull(group2);
        assertEquals(3, group2.getFreeSlots());


        Student stud4 = new Student();
        Student stud5 = new Student();
        Student stud6 = new Student();
        assertTrue(group2.addStudent(stud4));
        assertTrue(group2.addStudent(stud5));
        assertTrue(group2.addStudent(stud6));

        assertEquals(0, group2.getFreeSlots());

        //ok case remove student from index 0
        assertTrue(group2.remove(0));
        assertEquals(1,  group2.getFreeSlots());

        //false try to remove empty slot
        assertFalse(group2.remove(0));

        //remove student from 3rd slot
        assertTrue(group2.remove(2));
        assertEquals(2,group2.getFreeSlots());
        assertFalse(group2.isStudentAtSpecifiedIndex(0));
        assertFalse(group2.isStudentAtSpecifiedIndex(2));

        //adding students in the earliest empty slot
        Student stud7 = new Student();
        assertNotNull(stud7);
        assertTrue(group2.addStudent(stud7));
        assertEquals(1, group2.getFreeSlots());
        assertTrue(group2.isStudentAtSpecifiedIndex(0));
    }

}