public void CanCombineNonEmptySpecificationWithOther()
{
Expression <Func <User, bool> > condition1 = x => x.Person != null;
Expression <Func <User, bool> > condition2 = x => x.Orders.Count > 1;
var a = new Query <User>().Where(condition2);
var b = new Query <User>().Where(condition1);
var result = SpecificationExtensions.Combine <User>(
new CustomSpecification <User>(a),
new CustomSpecification <User>(b));
var query = (Query)result.Query;
Assert.Equal(QueryType.Where, query.Parameters.QueryType);
Assert.Equal(typeof(User), query.Parameters.InType);
Assert.Equal(typeof(User), query.Parameters.OutType);
Assert.Equal(condition1, query.Parameters.Expression);
query = query.Parent;
Assert.Equal(QueryType.Where, query.Parameters.QueryType);
Assert.Equal(typeof(User), query.Parameters.InType);
Assert.Equal(typeof(User), query.Parameters.OutType);
Assert.Equal(condition2, query.Parameters.Expression);
query = query.Parent;
Assert.Equal(QueryType.Empty, query.Parameters.QueryType);
Assert.Equal(typeof(User), query.Parameters.InType);
Assert.Equal(typeof(User), query.Parameters.OutType);
Assert.Null(query.Parameters.Expression);
Assert.Null(query.Parent);
}
