assertEquals uses the equals() method:
public void testEquals() {
Complex z1 = new Complex(1.0, 1.0);
Complex z2 = new Complex(1.0, 1.0);
assertEquals("1+i != 1+i", z1, z2);
}Implement the equals method:
public void testEquals() {
Complex z1 = new Complex(1.0, 1.0);
Complex z2 = new Complex(1.0, 1.0);
assertEquals("1+i != 1+i", z1, z2);
}