public void ResourceModel_IDataErrorInfo_ThisAccessor_HelpLink()
{
//------------Setup for test--------------------------
var instanceID = Guid.NewGuid();
var err1 = new Mock<IErrorInfo>();
err1.Setup(e => e.InstanceID).Returns(instanceID);
var err2 = new Mock<IErrorInfo>();
err2.Setup(e => e.InstanceID).Returns(Guid.NewGuid());
var model = new ResourceModel(new Mock<IEnvironmentModel>().Object, new Mock<IEventAggregator>().Object) { HelpLink = "somePath" };
//------------Execute Test---------------------------
var errMsg = model["HelpLink"];
//-------------Assert Results------------------------
Assert.IsNotNull(errMsg);
Assert.AreEqual("The help link is not in a valid format", errMsg);
}