I like the direction here, but please create an issue so we can track it. Also, the CLA failure will need to be fixed by amending this commit—and all future ones—to use your full name (which we require and are now verifying).

hi @gibson042 :)
The issue is done.
In my .gitconfig I have exactly:

[user]
    email = thomastortorini@gmail.com
    name = Mr21
[push]
    default = simple

I signed the CLA again yesterday with my nickname and my email. I don't understand what I have to do exactly. Do I have to write my real full name?

Do I have to write my real full name?

Yes.

Thanks @mzgol :)

I didn't respect exactly the principle of the atomic commit, so I redid my commit.
Now, only 3 lines change.

Actually, If we don't precise the easing the anim.originalOptions.easing will be undefined BUT
the anim.opts.easing will be the default value: "swing".

The duration don't respect the same idea. If I don't specify a duration the
anim.opts.duration and anim.originalOptions.duration will be equals to jQuery.fx.speeds._default (400). And I don't understand why there is also anim.duration directly.

Hi,

I read in your meeting nobody share my code design 😢 so I moved the this.easing = easing || jQuery.easing._default; in the Tween.js file.

But should I move the code of the duration || _default in the Tween file also?

I add two new tests for that but I have to change the variable's name of another test because it was using (and delete) the new jQuery.easing._default.

After you say it's better to see that in the Tween file I changed, but I didn't see the test animate with per-property easing (of the test/unit/effects.js file) failed.
It's concerne that:

jQuery(data).animate(
    {
        a: [ 100, "_test1" ],
        b: [ 100, "_test2" ],
        c: 100
    },
    400,
    "default_easing"
);

The property c should take the "default_easing" but this not work anymore with my 2nd commit.
But my first commit (when I change the effects.js file) works fine with this.

I'm having a hard time following this, so let me back up a bit and present a call stack as it appears in master:

Having gone through all of that, I think I understand what you're after: a guarantee of animation-level opts.easing. There's a potential problem from specialEasing (since properties are allowed to ease independently), but that is admittedly a rare case, and would still tolerate the animation-level default anyway. Note, however, that http://jsfiddle.net/Mr21/wh5sdgzu/ will not tolerate such variance because it looks for easing in anim.opts instead of a per-prop anim.opts.specialEasing[<prop>] or anim.tweens[<N>].

So the bottom line here is that I would be fine with use of jQuery.easing._default in both Animation and Tween.prototype.init. Tests for the former would assert that $collection.animate( props ) creates an animation with anim.opts.easing matching a custom jQuery.easing._default, and tests for the latter would do the same against anim.tweens[<N>].easing (and not matching for specialEasing tweens). Does that make sense?

@gibson042 nice summary!

So the bottom line here is that I would be fine with use of jQuery.easing._default in both Animation and Tween.prototype.init.

I didn't understand exactly where do you think I have to put the || jQuery.easing._default.
Because if I put it in the opts : $.extend( ... ) (like my first commit) I don't have to repeat it in the Tween.init part. I'm confused 😕

jQuery.easing._default will be referenced twice. You need it in Tween.prototype.init (as in f4a3c787) because tweens can be created outside of Animation, and you want it in Animation (as in df07ff70) so animation objects always have an "easing" property.

because tweens can be created outside of Animation

Ahhh okay, I didn't know this (I push another commit).

In Qunit I read (on my test):

3. No timers are still running
Expected: 0
Result: 1

Where is this test? And what I have to do to passe it?

That looks like one of our beforeEach/afterEach assertions, and indicative of an async issue (e.g., jQuery.fx.stop won't be called until the next tick).

Okay, I add this.clock.tick( 25 ); and it's work fine.