Add test for str() for class Point

test/test_point.py

@@ -24,6 +24,7 @@ def test_set_coordinates():
     assert pnt.get_x() == 321
     pnt.set_y(456)
     assert pnt.get_y() == 456
+    assert str(pnt) == "(321/456)"
 
 def test_get_random():
     """Test setting random points"""