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Intro my new QUnit callback assertion plugin
in QUnit and Testing
•
7 years ago
This is a QUnit assert plugin
to test sync callback. You can easily
assert that the callback can (only) be called at the correct moment,
and has the correct times.
Advices
from anyone are really welcome!
You can download from:
https://github.com/jareguo/qunit-assert-callback
Usage
var obj;
// Create and return a new callback wrapper for handling assertion.
obj.callback = assert.callback(callbackFunction_opt);
// By default, the callback is not allowed to call unless you call its enable method first.
// You can enable and disable repeatedly.
obj.callback.enable();
obj.callback.disable(msgWhenDisabled_opt);
// Expect the callback to be called any times you wish
obj.callback.expect(count, message_opt);
// Expect the callback to be called one time, and then reset the time to 0
// so that you can do this repeatedly.
obj.callback.once(message_opt);
Examples
Make Assertion failed if called
obj.onDown = assert.callback(); // disabled by default
var foo = function() { obj.onDown() };
foo(); // Assertion failed! onDown should not be called in foo!
Assert callback called
obj.onDown = assert.callback().enable(); // enabled this time ;)
var foo = function() { obj.onDown() };
foo(); // No error this time ;)
obj.onDown.once('onDown should be called once'); // Assertion succeeded!
Expect the callback to be called any times you wish
obj.onDown = assert.callback().enable();
vaf down = function() { obj.onDown() };
down();
obj.onDown.expect(1); // Okey!
down();
obj.onDown.expect(2); // Okey!
down();
down();
obj.onDown.expect(4); // Okey!
Disable the callback if you think it should not be called anymore.
obj.onDown = assert.callback().enable();
var foo = function() { obj.onDown() };
foo();
obj.onDown.once('onDown should be called')
.disable('onDown should not be called from now on');
foo(); // Assertion failed: onDown should not be called from now on
obj.onDown.enable();
foo();
obj.onDown.once('onDown should be called again')
.disable('onDown should not be called anymore');
foo(); // Assertion failed: onDown should not be called anymore
You can register a callback when the wrapper is called.
// callback 1
obj.onUp = assert.callback().enable();
// callback 2
obj.onDown = assert.callback( function(val) {
equal(this, obj, 'assert this');
equal(val, 520, 'assert argument');
equal(obj.onUp.calledCount, 1, 'onUp should be called before onDown!');
}).enable(); // dont forget enable!
obj.upAndDown = function() { obj.onUp(); obj.onDown(520) };
obj.upAndDown();
obj.onDown.expect(1, 'onDown should be called once!'); // Okey!