Jack: Mocking JavaScript the good way

<p>Jack is a new JavaScript mocking framework coming out of Bekk in Norway. A lot of the RSpec talent is there too, so they know their 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:

PLAIN TEXT

JAVASCRIPT:

// Expect one call to function
jack(function(){
jack.expect("jQuery.post").exactly("1 time");
storeSomething();
});
// Expect argument values
jack(function(){
jack.expect("jQuery.post")
.exactly("1 time")
.withArguments("http://example.com/service");
storeSomething();
});
// Set other argument constraints
jack(function(){
jack.expect("jQuery.post")
.exactly("1 time")
.whereArgument(0).isOneOf("/serviceOne","/serviceTwo");
storeSomething();
});
// Creating a mock object to run expectations against
jack(function(){
var mockObject = jack.create("mockObject", ['functionOne','functionTwo']);
jack.expect("mockObject.functionOne")
.exactly("1 time")
.whereArgument(0).is("something");
mockObject.functionOne("something");
});

1 Comment »

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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.
Comment by longgoldenears — October 18, 2008

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