public void Ctor_XmlOnly_DefaultsSetCorrectly()
{
MapnikProvider m = new MapnikProviderBuilder()
.SetXmlConfig(@"..\..\data\empty.xml");
Assert.AreEqual("png", m.PngOptions);
Assert.AreEqual("jpeg", m.JpegOptions);
Assert.AreEqual(0, m.GridLayerIndex);
Assert.AreEqual(4, m.GridResolution);
CollectionAssert.AreEquivalent(new List<string>(), m.GridFields);
}