How do I test Openstack APIs?

You could use the Ruby bindings which are based on the Cloud Servers API bindings. The Openstack API still has some functionality missing but the core is there.

1) First install the openstack-compute rubygem (gem install openstack-compute)

2) Then you can create Ruby scripts and objects to interact with the API. The example below works if you 'source novarc' first:

require 'rubygems'
require 'openstack/compute'

USERNAME=ENV['CLOUD_SERVERS_USERNAME']
API_KEY=ENV['CLOUD_SERVERS_API_KEY']
API_URL=ENV['CLOUD_SERVERS_URL']
cs = OpenStack::Compute::Connection.new(:username => USERNAME, :api_key => API_KEY, :api_url => API_URL)

cs.flavors.each do |flavor|
 puts flavor.inspect
end

cs.images.each do |image|
  puts image.inspect
end

cs.create_server(:name => "Test1", :imageId => 2, :flavorId => 1)

cs.servers.each do |server|
  puts server.inspect
end

Or if you want Python you can check out these:

https://github.com/rackspace/python-novatools

Great!!! Thank you very much.