Аbstract implementation or real tests at PHPUnit.
Why I ask about tests for "interfaces" without strict types (in most cases)?
Because many packages writing "Implementation of PSR-*" in description
don't even suspect that is not true.
As example: half libraries based on PSR-7 returning wrong result by
Psr\Http\Message::getHeaders(). They returns headers with normalized names
(array keys).
Also some standarts have very abstact description, we do not need to look
far for an example:
Call Psr\Http\Message::withHeader('Foo', '...')->withAddedHeader('foo',
'...');
What will return method getHeaders: ['Foo' => '...', ...] or ['foo' =>
'...', ...]?
I don't found answer in PRS-7 :(
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