Updated integration tests to use testing library

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>
Cleaned up stuff we do not need

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>
Improved creation of client
Also introduced a couple assertions to use for tests

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>