@Override
    public String toString() {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("left=");
        stringBuilder.append(this.left);
        stringBuilder.append(", top=");
        stringBuilder.append(this.top);
        stringBuilder.append(", right=");
        stringBuilder.append(this.right);
        stringBuilder.append(", bottom=");
        stringBuilder.append(this.bottom);
        return stringBuilder.toString();
    }
@Test
    public void toStringTest() {
        Rectangle rectangle = create(1, 2, 3, 4);
        Assert.assertEquals(RECTANGLE_TO_STRING, rectangle.toString());
    }