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refactors Discourse.debounce

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This commit is contained in:
Wojciech Zawistowski
2013-10-19 09:13:00 +02:00
parent aef4227073
commit d0f3765967
2 changed files with 21 additions and 40 deletions
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28
test/javascripts/components/debounce_test.js
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@ -4,6 +4,10 @@ var firedOnce = function(message) {
ok(original.calledOnce, message);
};
var firedTwice = function(message) {
ok(original.calledTwice, message);
};
var notFired = function(message) {
ok(!original.called, message);
};
@ -39,27 +43,20 @@ test("executes delayed function only once, no matter how many times debounced fu
firedOnce("second call was supressed");
});
test("does not prolong the timeout when the debounced function is called for the second time during the timeout", function() {
test("prolongs the timeout when the debounced function is called for the second time during the timeout", function() {
debounced();
clock.tick(50);
debounced();
clock.tick(50);
firedOnce("function is executed exactly at the end of the original timeout");
});
test("returns a JS timer handle that allows delayed execution to be cancelled before the timeout ends", function() {
var timerId = debounced();
notFired("at the end of the original timeout nothing happens");
clock.tick(50);
clearTimeout(timerId);
clock.tick(50);
notFired("timeout has ended but function was not executed");
firedOnce("function is executed exactly at the end of the prolonged timeout");
});
test("preserves first call's context and params when executing delayed function", function() {
test("preserves last call's context and params when executing delayed function", function() {
var firstObj = {};
var secondObj = {};
@ -67,11 +64,11 @@ test("preserves first call's context and params when executing delayed function"
debounced.call(secondObj, "second");
clock.tick(100);
ok(original.calledOn(firstObj), "the context of the first of two subsequent calls is preserved");
ok(original.calledWithExactly("first"), "param passed during the first of two subsequent calls is preserved");
ok(original.calledOn(secondObj), "the context of the last of two subsequent calls is preserved");
ok(original.calledWithExactly("second"), "param passed during the last of two subsequent calls is preserved");
});
test("can be called again (with a different context and params) after timeout passes", function() {
test("can be called again after timeout passes", function() {
var firstObj = {};
var secondObj = {};
@ -81,6 +78,5 @@ test("can be called again (with a different context and params) after timeout pa
debounced.call(secondObj, "second");
clock.tick(100);
ok(original.calledOn(secondObj), "function is executed with the context of the call made after the timeout has passed");
ok(original.calledWithExactly("second"), "function is executed with the param passed to the call made after the timeout has passed");
firedTwice();
});