AngularJS. Unit Testing AngularJS Filters and Services with Karma & Jasmine

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Briana Hines
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1 AngularJS Unit Testing AngularJS Filters and Services with Karma & Jasmine

2 Filters Filters can be added in AngularJS t frmat r transfrm data AngularJS prvides filters t currency - Frmat a number t a currency frmat. date - Frmat a date t a specified frmat. filter - Select a subset f items frm an array. jsn - Frmat an bject t a JSON string. limitt - Limits an array/string t a specified number f elements/characters. lwercase - Frmat a string t lwer case. number - Frmat a number t a string. rderby - Orders an array by an expressin. uppercase - Frmat a string t upper case.

3 Adding & Making Filters Filters can be added t expressins using the pipe character, Filters can be added t directives using the pipe character, Yu can create a custm filter by registering a new filter factry functin with yur mdule The filter returns a functin that returns a value

Testing Custm Filters Testing custm filters is similar t testing cntrllers Filters are the easiest cmpnents t test in AngularJS Create a test suite with describe.

4 Testing Custm Filters Testing custm filters is similar t testing cntrllers Filters are the easiest cmpnents t test in AngularJS Create a test suite with describe. The string parameter shuld include the name f the filter being tested. The functin parameter is the blck f cde that implements the suite Use befreeach t lad the mdule that cntains the filter being tested. Inject the $filter services in a befreeach blck Use $filter t lad the custm filter yu wish t test. Test the functinality f the custm filter

5 Examples Walk thrugh prcess f creating and running filter tests fr sample applicatin.

6 Services Services are substitutable bjects that are wired tgether using dependency injectin (DI) Yu can use services t rganize and share cde acrss yur app Angular services are: Lazily instantiated Angular nly instantiates a service when an applicatin cmpnent depends n it Singletns Each cmpnent dependent n a service gets a reference t the single instance generated by the service factry Like ther cre Angular identifiers, built-in services always start with $ (e.g. $http).

7 Custm Services T create a custm services register the service's name and service factry functin, with an Angular mdule Registering a service This is dne via the mdule API. Can use the mdule s factry methd t register a service Can use the mdule s service methd t register a service Yu can als register services via the $prvide service inside f a mdule's cnfig functin Each apprach makes a singletn bject available t the app

8 Testing Services Testing services is similar t testing cntrllers Create a test suite with describe. The string parameter shuld include the name f the service being tested. The functin parameter is the blck f cde that implements the suite Use befreeach t lad the mdule that cntains the service being tested. Inject the service being tested and its dependencies in a befreeach blck Use $filter t lad the custm filter yu wish t test.

9 Testing Services (2) Create mcks f dependency services We are nt interested in testing the functinality f the dependency services Only need t mck the functinality that is needed by the service that is being tested Created a nested test suite fr the service methd being tested Use a describe blck fr each methd Test the functinality f the service methd

10 Examples Walk thrugh prcess f creating and running custm service tests fr sample applicatin.

11 Resurces arjs-tests-with-an-http-mck.aspx

AngularJS. Unit Testing AngularJS Directives with Karma & Jasmine

AngularJS. Unit Testing AngularJS Directives with Karma & Jasmine AngularJS Unit Testing AngularJS Directives with Karma & Jasmine Directives Directives are different frm ther cmpnents they aren t used as bjects in the JavaScript cde They are used in HTML templates f