CBDW2014 - MockBox, get ready to mock your socks off!
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Mock what? What Mock?Learn What is Mocking, and how to use Mocking with ColdFusion testing, development, and continuous integration. Look at Mocking and Stubbing with a touch of Theory and a lot of Examples, including what you could test, and what you should test… and what you shouldn't test (but might be fun).
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CBDW2014 - MockBox, get ready to mock your socks off!
- 1. Just Mock It Mocks and Stubs Presented by Gavin Pickin Slides: http://gpickin.com/itb2014/ Website: http://gpickin.com Twitter: @gpickin
- 2. Introduc)on • Follow along with resources from h6p://gpickin.com/itb2014/ • If you want to find out more about me, my website has more than enough informa)on
- 3. 20 Second Agenda • Unit Tes)ng -‐ Recap • What is Mocking • What is a Mock / Stub • Why Mock • Let’s look at some Mocking
- 4. Unit Tes)ng “unit tes)ng is a soOware verifica)on and valida)on method in which a programmer tests if individual units of source code are fit for use. A unit is the smallest testable part of an applica)on” -‐ wikipedia
- 5. Unit Tes)ng • Can improve code quality -‐> quick error discovery • Code confidence via immediate verifica)on • Can expose high coupling • Will encourage refactoring to produce > testable code • Remember: Tes)ng is all about behavior and expecta)ons
- 6. Bugs Hurt
- 7. Bugs Hurt • Bugs hurt – the later in the process, the harder to fix. • Test Early and OOen – Find them before they rot your founda)on • Testable Code is Maintainable Code
- 10. Important Tests • Unit Tes)ng – Test behavior of individual objects • Integra)on Tes)ng – Test En)re Applica)on from Top Down • UI verifica)on tes)ng – Verifica)on via HTML/Visual elements
- 11. Important Tes)ng Tools • TestBox (Run BDD and MXUnit style) • IDE -‐ CF Builder / Eclipse • Mocking Framework • ANT • Jenkins, Bamboo, Teamcity, other Cis • Selenium • Jmeter or Webstress Tool, Apache AB
- 12. What is Mocking? According to Merriam Webster • to laugh at or make fun of (someone or something) especially by copying an ac)on or a way of behaving or speaking • to imitate (as a mannerism) closely
- 13. What is Mocking? "A mock object is an object that takes the place of a ‘real’ object in such a way that makes tes)ng easier and more meaningful, or in some cases, possible at all" by Sco6 Bain -‐ Emergent Design
- 14. Mocks
- 15. Mocks
- 16. Mocks
- 17. Mocks
- 18. Stub Object • A stub is an empty container, that represents an Object. • This can be useful for represen)ng CFCs and Objects that haven’t been wri6en yet.
- 19. Why use Mocking • Isolate your SUT -‐> SoOware Under Test • To build against interfaces & contracts • Building against missing integra)on pieces • To control data and expecta)ons • Mock components whose behavior is undesirable or hard to control
- 20. Why Mock? • How do you test when helper components that are not built yet? • How do you do controlled excep)ons? • How do you test & control external API calls? • How do you control results from ColdFusion tags or func)ons? • How do you control network connec)ons? Do you pull the network plug?
- 21. Why Mock? How do you test code like this? <cfdirectory ac)on=”list” directory=”#arguments.path#” name=”qResults”> <ck6p url=”#arguments.urlPath#” results=”qResults”> <cfmail to=”#to#” from=”#from#” subject=”#subject#”>#content#</cfmail> <cfquery /> func)on init(){ var helper = new Helper(); } private func)on getData(){ return data; }
- 22. The COLD hard truth – It can Hurt • Tes)ng some code is hard, or almost impossible. • Refactor it • Mock it • Test It • With CI, you can forget about it Un)l it breaks
- 23. Refactor to make it Mockable • Original: <cfdirectory ac)on=”list” directory=”/myapp/path” name=”qResults”> • Refactored <cffunc)on name=”getFiles” output=”false” returnType=”query”> <cfargument name=”path”> <cfset var qResults = “”> <cfdirectory ac)on=”list” directory=”#arguments.path#” name=”qResults”> ... Process Here ... <cfreturn qResults> </cffunc)on>
- 24. Normal View of your Service
- 25. Mock/Test View of your Service
- 26. What do we Mock? • Excep)ons • Data • CFC and Objects • Methods in our CFCs • Proper)es in our CFCs
- 27. Mocking Framework • Introducing
- 28. What can MockBox do? • Mock Objects with or without implementa)ons • Mock methods & proper)es in any scope • Create Stub Objects -‐> Non-‐existent objects • Mock excep)ons • Mock arguments to results • Logging & Debugging • Verifica)on methods • State Machine Results
- 29. Sepng up MockBox • Standalone Version (FW/1, Fusebox, Model Glue, Home Brewed) mockBox = createObject(“component”,”mockBox.system.tes)ng.MockBox”).init(); • Running from inside ColdBox (outside of TestBox) mockBox = createObject(“component”,”coldbox.system.tes)ng.MockBox”).init();
- 30. Using MockBox • MockBox does its magic dynamically, adding / decora)ng CFCs with necessary methods. • CreateMock() user = mockBox.createMock(“model.User”); • CreateEmptyMock() dao = mockBox.createEmptyMock(“model.UserDAO”); • PrepareMock() mockBox.prepareMock( service );
- 31. Using MockBox -‐ Stubs • CreateStub() – Create a simple empty Stub – Pass an Implements to get a Mock Interface – Pass an Extends to get a Mock with Inheritance nonExistentService = mockBox.createStub(); mockInterface = mockBox.createStub(implements=”model.ICache”); mockInheritance = mockbox.createStub(extends=”model.SecurityService”);
- 32. Injected Methods
- 33. $() • Argument – method – returns – preserveReturnType – throwExcep)on – throwType – throwDetail – throwMessage – callLogging // Cascaded mocks mockUser.$(“isFound”,true).$(“isDirty”,true); // Mock Exception mockUser. $(method=”save”, throwsException=true, throwType=”IllegalStateException”, throwMessage=”Invalid User Data”); // Mock Return Objects mockRole = mockBox.createMock(“Role”); service.$ (method=”getRole”,returns=mockRole);
- 34. Using $() mockUser = mockBox.createEmptyMock(“model.User”).init(); userService = mockBox.createMock(“model.UserService”).init(); user = userService.$(“get”, mockUser); //Technique 1 – Constant Result user.$(“getName”, “Rose Tyler”); //Technique 2 – Rota)ng Results user.$(“getName”).$results(“Rose Tyler”, “Amelia Pond”, “River Song”);
- 35. Using $args() • Results based on the Arguments Passed • Must be chained via Results. // Call to Mock if( dao.getSepng(“userAudit”) ){ startAudit( dao.getSepng(“auditTables”) ); }; // Mocking Calls dao.$(“getSepng”).$args(“userAudit”).$results(true); dao.$(“getSepng”).$args(“auditTables”).$results(“user,order,
- 36. Using $args() • Arguments are smart like normal func)ons – Posi)onal Arguments saveUser(”Rose”,”Tyler”); – Named Arguments saveUser(fname=”Rose”,lname=”Tyler”); – Argument Collec)ons data = { fname = “Rose”, lname = “Tyler” }; saveUser(argumentCollec)on=data);
- 37. $results() • Your results can be – Constant – Or Sequenced • Your results will loop over and over. • Argument Based Results can also be repe))ve in a sequence.
- 38. $property() • Mock any property on any scope • Great for sepngs and dependency injec)on mocking // Mock a sepng on the variables scope service.$property(“cacheAc)ve”,”variables”,true); // Mock a file u)lity object mockU)l = mockbox.createEmptyMock(“u)l.FileU)ls”); service.$property(“fileU)l”,”variables”, mockU)l); // Mock in the variables.instance scope path service.$property(“isDirty”,”instance”,true);
- 39. Verifica)on Methods * Verification methods return boolean so they can be asserted
- 40. Verifica)on Methods func)on testVerifyCallCount(){ test.$("displayData",queryNew('')); assertTrue( test.$never() ); assertTrue( test.$never(“displayData”) ); test.displayData(); assertFalse( test.$)mes(1,”displayData”) ); assertFalse( test.$once(”displayData”) ); test.displayData(); assertEquals(true, test.$verifyCallCount(2)); }
- 41. Verifica)on Methods func)on testMockMethodCallCount(){ test.$("displayData",queryNew('')); test.$("getLuis",1); assertEquals(0, test.$count("displayData") ); assertEquals(-‐1, test.$count("displayData2") ); }
- 42. Lets look at a Demo h6p://justmockit.local.com Code available at: h6ps://github.com/gpickin/justmockitdemo
- 43. The End – Thank you • Thanks everyone for making it this far • All of the materials will be on my ITB presenta)on Site: h6p://www.gpickin.com/itb2014/ • Hit me up on twi6er @gpickin • Read more on my blog: h6p://gpickin.com • Check out my CFO Session Thursday, 15th 11:30am – 12:30am on Lakes Ballroom C