fixed network test

[helenosheaa]

Fixed network test by adding a mock client for failing test coming back with connection failure instead of dns failure

[srebhan]

The problem only occurs if you set a proxy in your environment. Unsetting it will make the test pass. The reason behind is that you get a "Bad gateway" error message from your proxy (Squid at least) instead of the DNS error expected.
So I'd rather like to ask you to implement a way for the plugin to ignore the environment proxy, e.g. by setting the http_proxy option to "-". This is helpful in production environments and allows us to force the tests into not using any proxy a.k.a. reproducible environment. :-)

Are you willing to do this?

[ssoroka]

@srebhan I think it's a bigger issue that this test relies on DNS failure from a live request. There are lots of ways for internet-destined requests to fail, and I generally don't like tests requiring internet access. stubbing out the response accomplishes what the test intended.