I have a bit of a strange situation.
I have an Repository implementation which is based on a fluent
interface for defining a Find query, it looks something like this:
var returnedItems = repository.Find(some_ICriteria)
.Order(some_Order)
.Group(some_Projection_for_group)
.All()
Now, when testing this I need to write for example for SetupResult the
following tedious code:
var findMock = mocks.DynamicMock<FindQueryPart>();
var orderMock = mocks.DynamicMock<OrderQueryPart>();
var groupMock = mocks.DynamicMock<GroupQueryPart>();
var returnedItems = new List();
SetupResult.For(repository.Find(some_ICriteria)).Return(findMock);
SetupResult.For(findMock.Order(some_Order)).Return(orderMock);
SetupResult.For(orderMock.Group(some_Projection_for_group)).Return(groupMock);
SetupResult.For(groupMock.All()).Return(returnedItems);
As you can imagine, for a single query call this is alot of code, and
somehow I feel it smells (I need this amount of code because each step
in the fluent interface above returns a different object via interface
(e.g. IFindQueryPart).
One important thing is that the SetupResult must chain the methods in
exactly the way they've been chained in the call (for example Order
must be chained to Group and not vice versa).
Now to aid this, I've written a Lambda expression inspector (simple
stuff) which call looks like this:
MockFromLambda(repository => repository.Find(some_ICriteria)
.Order(some_Order)
.Group(some_Projection_for_group)
.All());
And it is able to return to me a MethodInfo object for each call in
the chain (Find call, Order call, Group call and All call).
My question is now... how can I generate a DynamicMock from the
information in that MethodInfo? and after that feed that to the
SetupResult?
The idea would be to dynamically generate the chain of mocks from the
Lambda expression and chain them all together?
Any ideas anyone? Has anyone tried this before?
Thanks,
Vladan
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