Default response and exception for mock client

[soullivaneuh]

php-http/mock-client#21

[dbu]

i think we need to be a bit more explicit here and say in the introduction that you can set a list of responses resp exceptions that are returned in order (exceptions first), and/or default exception / response for when the lists are empty.

(oh, and its kindof odd that we first throw all exceptions and then return responses in the list, rather than strictly keeping the order. i can't test something like exception, response, exception with the mock client. but changing that would be a confusing BC break for tests built on it. but the doc should at least mention it)

[soullivaneuh]

@dbu Do you have some code sample to propose?

[dbu]

i think we should have text for that rather than just samples. samples are implicit.

something like "By default, the mock client returns an empty response with status 200. You can set responses and exceptions the mock client should return / throw. You can set several exceptions and responses, to have the client first throw each exception once and then each response once on subsequent calls to send(). Additionally you can set a default response or a default exception to be used instead of the empty response."

[soullivaneuh]

@dbu updated.