Automated Unit and Integration Testing with NDbUnit
Sample code available here: https://github.com/ruthlesshelp/Presentations When coding and running automated integration tests, have you bumped into "database in an unexpected state" failures? The database is often in the wrong initial state when test code runs. NDbUnit is a .NET library for managing database state for unit and integration testing. As a database testing framework, it provides the capability to arrange the data in the database before and after a test method runs. This helps ensure that the database’s state is consistent for the execution of each test. In this presentation, you will learn: How to unit test a stored procedure with NDbUnit How to automate the integration testing of the data access layer How to enable refactoring through automated integration testing How to improve automated UI testing with NDbUnit NDbUnit clears away some very significant automated testing obstacles, which can help you avoid common pitfalls of automated testing. About Stephen Ritchie - Stephen Ritchie is the author of Pro .NET Best Practices (http://www.apress.com/9781430240235). He has been writing software professionally for over 20 years. He is the .NET best practices steward at Excella, working together with .NET project teams to facilitate and to implement new and better development practices. He is often called upon to setup the continuous integration server, perform code analysis, and automate the testing, packaging and deployment of software.
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Automated Unit and Integration Testing with NDbUnit
- 1. Automated Unit and Integration Testing with NDbUnit Stephen D. Ritchie 1-May-2012
- 2. Chrysler New Yorker Excella Consulting
- 3. Overview • Unit Testing Databases Is Difficult – CRUD Operations on Tables – Complex Querying of Multiple Tables – Views – Functions – Stored Procedures – Triggers !?! Excella Consulting
- 4. Overview • Automated Integration Testing With Databases Is Really Difficult – “Data Not In Known-State Before Test” Excella Consulting
- 5. Overview • Object Relational Mapping (ORM) – Entity Framework – NHibernate – Linq2Sql • Linq Queries Excella Consulting
- 6. Overview • NDbUnit – Database Testing Framework • Borrows from the Java community’s DbUnit • “.NET library for managing database state during unit testing” – Apache License, Version 2.0 • Free and Open Source – NDbUnit Project • http://code.google.com/p/ndbunit/ – NuGet Package • http://nuget.org/packages?q=NDbUnit – Supports Many Databases • Microsoft SQL Server 2005 and 2008 (Express thru Enterprise) • Oracle (XE thru Enterprise, 9i and later) • SQLLite Excella Consulting
- 7. Tell Me More … • How does NDbUnit work? • Perhaps an example would be helpful … Excella Consulting
- 8. Unit Testing Databases Is Difficult • Unit Testing Databases Is Difficult – CRUD Operations on Tables – Complex Querying of Multiple Tables – Views – Functions – Stored Procedures – Triggers !?! • Perhaps an example would be helpful … Excella Consulting
- 9. Automated Integration Testing With Databases Is Really Difficult • Automated Integration Testing With Databases Is Really Difficult – “Data Not In Known-State Before Test” • Perhaps an example would be helpful … Excella Consulting
- 10. Automated Testing The “Surface API” • “Surface Testing” – DAL • Perhaps an example would be helpful? Excella Consulting
- 11. Integration Testing The ORM Interface • “Surface Testing” Revisited – ORM Interface Surface • NDbUnit – Independently Controls the Data Store Excella Consulting
- 12. NDbUnit Downside • Independence Has A Cost – Separately Defined The Schema – Separately Defined Each Known-Data-State • Changing Schema – Updating DataSet – Updating XML Files Excella Consulting
- 13. NDbUnit Upside • Liberates Refactoring – Switch from CRUD Stored Procedures to ORM – Database Consolidation – Automated Integration Testing Legacy Code • Leap Forward • Reporting – Test Report Queries Independent of Reporting Tool • Browser Testing – Put Database In Known State • Smoke, Stability, Performance, Regression and Other Testing – Automated Integration Testing Excella Consulting
- 14. Of Course It’s Safe … After You Excella Consulting
- 15. Shameless Self Promotion Time! Get 40% off Pro .NET Best Practices! • Buy the eBook at Apress.com • Enter the promo code: CMAP12 • Formats: PDF, ePub, or MOBI • Valid until May 31, 2012 Excella Consulting
- 16. More Shameless Self Promotion • Email: stephen.ritchie@excella.com • Twitter: @ruthlesshelp • Blog: http://ruthlesslyhelpful.net • LinkedIn: http://www.linkedin.com/in/sritchie • Facebook: http://www.facebook.com/ProDotNetBestPractices Excella Consulting
Editor's Notes
- Introductory remarks.
- The database is a subsystem that is often treated like a “black box”.Development team often own the stored procedures, function, and triggers. They often have logic that satisfies an explicit or implicit requirement.In many organizations, the DBA team owns the table schema.Unit testing databases is difficult because a “unit”, such as a table, is hard to test in isolation. For example, your test code might need to use ADO.NET to query the table. Any number of configuration issues might prevent the test from passing. Besides, this is an integration test.Unit testing stored procedures is difficult because it is difficult to “Arrange” that the data in the tables is mocked so that it is in a known state before the test code executes the SP.