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Building a Testable Data Access Layer

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Todd Anglin
Todd Anglin

All developers understand the theoretical value of unit testing, but with data driven applications, figuring out how to create tests can be hard. In this session, you will learn how to design and build a data layer that can be tested. We will introduce data layer architecture practices and methodologies that make testing possible, and cover the basics of unit test mocking. You will also be guided through various types of testing, including unit, integration, and functional testing. Leave this session with the basics needed to start creating tests for application data layers, including those powered by LinqToSQL and Entity Framework.

Technologie
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Building a Testable Data Access Layer Todd Anglin Chief Evangelist, Telerik Level: Intermediate
Introductions ,[object Object],[object Object],[object Object],[object Object],[object Object],@toddanglin TelerikWatch.com
today’s plan
what is a “data layer”?
Data Layer ,[object Object],Presentation Web Desktop Domain Logic (“the code that makes you money”) Data / Model Service Persistence Database Cloud XML Etc.
why build a data layer? what’s the benefit?
importance of data layer ,[object Object],[object Object],[object Object],[object Object]
Presentation Web Desktop Domain Logic (“the code that makes you money”) Data Persistence Database Cloud XML Etc. Service
a good data layer…
[object Object],[object Object],[object Object],[object Object]
a bad data layer is…
[object Object],[object Object],[object Object]
how do we build “data layers”?
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
popular .NET ORMs
DEMO ,[object Object]
data layer patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DEMO ,[object Object]
testing the data layer
two testing camps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Test Database B Mock Database
picking a camp ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
testing considerations ,[object Object],[object Object]
UNIT TEST ,[object Object],INTEGRATION TEST “ Test interaction between units.” FUNCTIONAL TEST “ Test behavior from user perspective.”
mock testing ,[object Object],B Database Communication (ORM, ADO.NET, etc.) Repository Business Code UI Behaviors Services Database
mocking ,[object Object],[object Object],Mocking Tools: JustMock (by Telerik) Isolator (by TypeMock) MOQ (OSS) RhinoMocks (OSS)
AAA mocking pattern ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DEMO: MOCKING DATABASE ,[object Object]
test database ,[object Object],A ,[object Object],[object Object],[object Object],[object Object],[object Object]
hard parts ,[object Object],[object Object],[object Object],[object Object],[object Object]
rules for test database tests ,[object Object],[object Object],[object Object],[object Object],[object Object]
DEMO: TESTING WITH REAL DB ,[object Object]
should you test your DAL?
[email_address] @toddanglin telerikwatch.com Q & A
Links ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Building a Testable Data Access Layer

Notes de l'éditeur

  1. Visual Studio Live Orlando 2010MGB 2003 © 2003 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.
  2. Easy = Easy to build if you’re not careful
  3. Everything is familiar up to this point. Now the dreaded step may of us avoid: Creating tests for the data layer
  4. Hides issues example = concurrency, auto-gen DB values, etc.