Test2::Mock should optionally track HiRes timestamps for calls

[afresh1]

I recently hit a place where I had to mock out two different interfaces, but wanted to confirm that they got called in the correct order.

use Test2::Mock;

my $first = Test2::Mock->new(
    track => 'WithTimestamps', # or some other interface
    class => 'AClass',
    ...,
);

my $second = Test2::Mock->new(
    track => 'WithTimestamps', # or some other interface
    class => 'AnotherClass',
    ...,
);

...; # do stuff that calls mocked methods on both classes.

my @ordered_calls = sort { $a->{ts} <=> $b->{ts} } (
    @{ $first->call_tracking ),
    @{ $second->call_tracking },
);

like \@ordered_calls, [
    { sub_name => ..., args => [ 'AClass' ] },
    { sub_name => ..., args => [ 'AnotherClass' ] },
    { sub_name => ..., args => [ 'AClass' ] },
    ...,
];

[afresh1]

Thinking more on this, I don't actually need the timestamp, perhaps a more flexible solution would be a callback:

my @call_tracking;
my $mock1 = Test2::Mock->new( track => sub { push @call_tracking, $_[0] }, ... );
my $mock2 = Test2::Mock->new( track => sub { push @call_tracking, $_[0] }, ... );
...;

If $_[0] was the ref that was going to be added to call_tracking, someone actually wanting a timestamp could add it themselves.

my $mock = Test2::Mock->new( trace => sub { $_[0]->{ts} = gettimefday }, ... );