@Test
public void empty() {

    String empty = new SvgDrawVisitor(50, 50, Depiction.UNITS_MM).toString();
    assertThat(empty, is("<?xml version='1.0' encoding='UTF-8'?>\n"
                         + "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n"
                         + "<svg version='1.2' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='50.0mm' height='50.0mm' viewBox='0 0 50.0 50.0'>\n"
                         + "  <desc>Generated by the Chemistry Development Kit (http://github.com/cdk)</desc>\n"
                         + "</svg>\n"));
}