public void TestGetRegions()
{
var instance = new TestDocument();
Assert.IsNull(configuration.GetRegions(instance));
configuration.HasRegions(x => x.Regions);
Assert.IsNull(configuration.GetRegions(instance));
instance.Regions = new string[] { "value" };
Assert.IsTrue(Object.ReferenceEquals(instance.Regions, configuration.GetRegions(instance)));
}