First few tests

SetTest.java

import org.junit.Test;
import static junit.framework.TestCase.*;

/* requirements: Implement the following behavior: 
    set() - creation with or without specified size
    add()
    clear()
    contains()
    isEmpty()
    iterator()
    remove()
    size()
*/

public class SetTest {

    @Test
    public void canCreateAnEmptySet(){
        Set set = createSet();
        assertTrue(set.isEmpty());
    }

    @Test
    public void anEmptySetHasNoSize(){
        Set set = createSet();
        assertEquals(0, set.size());
    }

    @Test
    public void canCreateSetForSpecificSize() {
        Set set = createSet(4);
        assertEquals(4, set.size());
    }

    @Test
    public void setsWithSizeGreaterThanZeroShouldNotBeEmpty() {
        Set set = createSet(4);
        assertFalse(set.isEmpty());
    }

    @Test
    public void canClearASet() {
        Set set = createSet(4);
        set.clear();

        assertSame(0, set.size());
    }

    @Test
    public void clearingASetEmptiesTheSet() {
        Set set = createSet(4);
        set.clear();

        assertTrue(set.isEmpty());
    }

    private Set createSet() {
        return new Set();
    }

    private Set createSet(int size) {
        return new Set(size);
    }

}