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Approval Tests - A Library for All Developers

by Lynn Langit

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deck from my talk at SoCalCodeCamp June 2011 - library at www.ApprovalTests.com

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www.ApprovalTests.com-->http://approvaltests.sourceforge.net/
ice-breaker - Comic credit - http://almaer.com/blog/uploads/feelingagile.png
Idea here is common misconceptions, i.e. ‘why I do not do TDD’Why TDD == spec, feedback, granularity, regressionIke to tell story of ‘why’ TDD change lock.
change perception.Photo credit – “Seeing the Invisible” - http://fc03.deviantart.net/fs71/i/2010/299/4/7/seeing_the_invisible_by_beloved_art-d31kfsc.jpg
Simple C# demo, show Console (breakpoint), Assert, Approve, Reporter with Add, then with Explain, then into Reporters (DiffHTMLDiff)Here are the steps from www.ApprovalTests.comStep 1: Create your scenario Step 2: Write that scenario in EnglishStep 3: Translate English to Code (TDD – name objects / methods FIRST)Step 4: Create Code so it works (Implement named objects / methods)Step 5: Run your test for feedback while you codeStep 6: Approve result so it continues to workStep 7: Change the requirement Step 8: See the new solution Step 9: Re-approve so it continues to work
Make the point that you can use ApprovalTests at all levels of testing granularity – both TDD (small) and BDD (big) AND in between – Approvals == better Asserts
Lynn talks about set up in C#Direct to www.ApprovalTests.comLibrary (mandatory)DiffTool (can select type, but will want to use) VS2010 – TortoiseDiff, WinDiff, doesn’t not work with BeyondCompare yetPlug-in (optional)  right click (highlight test method)  Approve (only appears when test is failing)
Re-iterate the testing cycle steps for TDD for new code, maybe mention BDD hereShow that the first illustration is incomplete – doesn’t include the ‘think it out / visualize it’ step
Point out that the reporters vary for the different (language) implementations, i.e. C#, Java, etc.. Point to the documentation!Reporter are VIEWERS for results on test FAILURE onlyIncluded reporters which are not listed are also WinDiff and BeyondCompareTypes – text, image, HTML, more?
Demo the VS2010 plug in, right-click ‘Approve’ – only works when test has not passed already.Contents provided are serialized to the file, depending on the Writer (which is encapsulated and associated to the method, examples:Approve(“”)*.txtApproveHtml(“”)*.htmlApprove(WinForm)*.pngApprove(IExecutableQuery)*.txt (SQL statement source generally)The act of approving allows you to take the contents of the received file and write them Namer – creates file name based on method nameWriter (depending on type, i.e. string) – inserts contents of object (i.e. string) into the new fileApprover – checks to see whether *.received file equals *.approvedReporter – called only on failure and then report (show) both files (*.approved & *.received)Received file is the contents that you gave the Writer written to the that file, the type is determined by the Writer, i.e. tiff, png
Can approve ‘parts’ of a form (controls), or reports (RDLC), different types of files, such as .tiff, etc…*to test part of a Form, must make that part (control) publicC# demo using WinDiff (or TortoiseImageDiff) – new code TDD, ReSharper or VS refactoring tools?Do a version of this demo - http://www.youtube.com/watch?v=k5Y_jo4Nn54Also for ArraysThere is a header and lambda function for arrays that allows for thetesting circle.var word = "Llewellyn";Approvals.Approve(word, word.ToCharArray(), (c) => c+ " => " + (int)c);would produce:LlewellynL => 76l => 108e => 101w => 119e => 101l => 108l => 108y => 121n => 110
About writing the ‘functional method(s)’ which will be tested by CombinationApprovalsTalk about the limits of ‘functional’ coding, not only for F#, i.e. coding in a functional way, testing in a functional way.  stored proc on visual.Photo credit – “Seeing the Invisible” - http://fc03.deviantart.net/fs71/i/2010/299/4/7/seeing_the_invisible_by_beloved_art-d31kfsc.jpg
There is a header and lambda function for arrays that allows for thetesting circle.var word = "Llewellyn";Approvals.Approve(word, word.ToCharArray(), (c) => c+ " => " + (int)c);would produce:LlewellynL => 76l => 108e => 101w => 119e => 101l => 108l => 108y => 121n => 110
Testing non-deterministic results – blog – testing the weatherOn test “pass”, there is NOT call to the data source (web service, database, etc…)ILoader implements Load(), uses IExQuerycombines, creates abstract base LoaderForSystem, example:SQL  conn string, T-SQLEF  conn string, LINQWCF  server, URL (query)
Biz opportunity (i.e. how much) Legacy code is out thereIntro the idea of using approvals for legacy code in addition to TDD (i.e. test-first on new code)Image credit - http://www.agilitrix.com/wp-content/uploads/2010/03/Legacy-Systems-ThoughtWorks-QTB.jpg
Explain the syntax of Approvals.ApproveAllCombinations(arg,arg,arg) in C# (9 overloads)Can pass  Enumerable, Array, RangeContrast to Debug.Assert (individual results) – Approvals.ApproveAllCombinations much richer output, here you are testing EVERY element in combination
Intro the idea of using approvals for legacy code in addition to TDD (i.e. test-first on new code)Code coverage in VS2010 Ultimate or can use DotCover (around $ 100), or othersCode Coverage is defined as running your tests and seeing how much of your code is ‘covered’
Intro the idea of using approvals for legacy code in addition to TDD (i.e. test-first on new code)
Legacy Code demo in Java, locking test, and code coverageDo a version of this demo - http://www.youtube.com/watch?v=EJ1tRFEOkcwDo this in C#CombinationApprovals.Approve (, enum(r1Start,r1Length), enum(r2Start,r2Length)
Besure to read the FAQ - http://approvaltests.sourceforge.net/?q=node/3
Future – Approval Katas or Koans“Try our bowling with approvals. - Java / C# with MS Test / C# with Nunit”
www.ApprovalTests.com-->http://approvaltests.sourceforge.net/

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Dennis Ashendorf, Online Math & Science Teacher at Back Bay High School 1 year ago

Approval Tests - A Library for All Developers Presentation Transcript

Approval Tests
Lynn Langit
A library for you
So, are YOU Agile?
Do you code in C#, VB.NET, Java, PHP or Ruby?
Why TDD?
Better spec / scope
Define, then create (objects)
Do  Verify
Feedback/regression/granularity
But…
Littered with Asserts?
Extra work  less productivity?
Why Test-Driven?
For Code Quality
Tests are ‘kind of’ important
Africa is ‘kind of’ big…
Demo
How do I get started?
How Test-Driven
TDD
BDD
Think Bigger
Less Code
Scenarios
How do Approvals fit with both?
Assert
Do
Verify
Setup
Download Approvals
Download IDE plugin
VS2010, VS2008
Select DiffTool(s)
Approve is the new Assert
Applying Approvals
About Reporters
How to Approve
- Rename *.received to *.approved
- Right click ‘Approve’ (plug-in)
- Right click ‘Use whole file’ (DiffReporter)
- Copy ‘Move’ statement from Test Results to command window
Contents provided are serialized to the file
Demo
I want to test a GUI…
Functional ‘ality’
Testing the untestable
How do I make THAT functional?
Testing Arrays…
Testing multiple values
Testing the Weather using SQL Server – Approvals.Approve(Loader…)
DEMO
Testing non-deterministic objects
Legacy Code
How much of your code base is dead code?
Combinations
Combination Approvals
Code Coverage
How much of your code base is covered?
Coverage Config
Code Coverage in VS 2010 Ultimate
Demo
I want to test combinations...
Who wrote this?
Dan Gilkerson (@dangilkerson)and Llewellyn Falco (@isidore_us)
Now I want THAT
www.ApprovalTests.com
Pick your language & download
Pick your diff tool
Reference, Approve & Enjoy
Approval Tests
Lynn Langit@llangit
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Approval Tests - A Library for All Developers

by Lynn Langit

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Approval Tests - A Library for All Developers Presentation Transcript