Thursday, October 16th, 2008
Jack: Mocking JavaScript the good way
Category: Testing
Jack features:
- Set expectations for number of calls and argument constraints
- Specify mock implementations for specific expectation scenarios
- Create mock objects with a list of stub functions
- Reports expectation failures to test frameworks. Currently integrated with JSSpec and Scriptaculous TestRunner
Examples show it off:
JAVASCRIPT:
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// Expect one call to function
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jack(function(){
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jack.expect("jQuery.post").exactly("1 time");
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storeSomething();
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});
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// Expect argument values
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jack(function(){
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jack.expect("jQuery.post")
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.exactly("1 time")
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storeSomething();
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});
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// Set other argument constraints
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jack(function(){
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jack.expect("jQuery.post")
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.exactly("1 time")
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.whereArgument(0).isOneOf("/serviceOne","/serviceTwo");
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storeSomething();
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});
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// Creating a mock object to run expectations against
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jack(function(){
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var mockObject = jack.create("mockObject", ['functionOne','functionTwo']);
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jack.expect("mockObject.functionOne")
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.exactly("1 time")
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.whereArgument(0).is("something");
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mockObject.functionOne("something");
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});
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Related Content:
4.2 rating from 34 votes
jqMock was my attempt at writing a javascript mock library. It has comprehensive expectation support, with complex argument matching criteria, ordered/unordered expectations, multiplicity control, intercepting return values and throwing exceptions.