public void GetValueCallsDataContext()
{
var dataContextMock = new Mock<IYateDataContext>();
var valueMock = new Mock<IValue>();
valueMock.Setup(dc => dc.GetValue(It.IsAny<IYateDataContext>())).Returns("*");
var modelFunction = new ModelFunctionValue(valueMock.Object);
modelFunction.GetValue(dataContextMock.Object);
dataContextMock.Verify(dc => dc.GetValue(It.IsAny<string>()), Times.Once());
}