Adds an every call that can be chained in expectations for traversable

[lukeraymonddowning]

Often, I find myself wanting to assert that everything in an array or Laravel Collection passes a given test.

For example, I might want to make sure that everything in a Collection is an instance of a certain class, or that no item in an array is greater than a certain value.

This PR adds the every method, which allows the user to perform assertions on individual items in iterable values.

Usage

Imagine we want to make sure that every item in an array is less than 100. This PR allows for this with the every method:

test('it works', function () {
    expect(range(1, 99))
        ->every->toBeLessThan(100);
});

It works with not and and methods:

test('it works', function () {
    expect(range(1, 99))
        ->every->not->toBeString()
        ->and(['hello', 'world'])
        ->every->not->toBeInt();
});

If this is something that you see as valuable, let me know if there are any changes you'd like to see and I shall sort it 👍

Thanks for the insanely beautiful API that is the expectations plugin!

[nunomaduro]

Just docs missing. Can you pull request them? I will re-work some types/phpdocs later.

[nunomaduro]

I feel that this should be:

test('it works', function () {
    expect(range(1, 99))
        ->each->toBeLessThan(100);

    expect(range(1, 99))
        ->each(fn ($number) => $number->toBeLessThan(100));
});

[nunomaduro]

Going to update the pull request locally.

[nunomaduro]

@lukeraymonddowning Ok - I've reworked the pull request here: 75474c1.

Can you take a look why this test is failing? 75474c1#diff-fd27a2cd204cb5863fe4e29ba58b987d235512ed4448e5eadba046a81aa10eceR39.

[lukeraymonddowning]

@nunomaduro Fixed in #8