[Catalyst] using Plugin::Singleton and testing

[Matt S Trout]

Daniel McBrearty wrote:
> I have a method in a model that goes like this:
> 
> sub do_something {
>    my ($self, $my_var) = @_;
> 
>    $my_var = MyApp->context->stash->{my_var} unless defined $my_var;
>    die "my_var not defined" unless defined $my_var;

Plugin::Singleton considered a really, really, really bad idea.

Don't use it.

Implement COMPONENT or ACCEPT_CONTEXT (see Catalyst::Component) as appropriate 
instead.

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