public void SortBy_WhenExpressionAllreadyBeenAssigned_ThrowsSisoDbException()
{
var sortingParserFake = new Mock <ISortingParser>();
sortingParserFake
.Setup(f => f.Parse(It.IsAny <Expression <Func <MyClass, object> >[]>()))
.Returns(new Mock <IParsedLambda>().Object);
var builder = CreateBuilderWithFakes();
builder.SortingParser = sortingParserFake.Object;
var expression = Reflect <MyClass> .ExpressionFrom <object>(m => m.Int1);
builder.SortBy(expression);
Assert.Throws <SisoDbException>(() => builder.SortBy(expression));
}