test: basic test for OmniAuth Strategy

Also change name to sso and use Hash.select instead of Hash.slice which
is only provided by ActiveSupport.

lib/omniauth/strategies/sso.rb

@@ -21,7 +21,7 @@ module OmniAuth
       end
 
       info do
-        info_from_ticket.slice *options.fields
+        info_from_ticket.select{|key,_val| options.fields.include? key}
       end
 
       def authorize_url(_params_from_options)
@@ -30,7 +30,7 @@ module OmniAuth
       end
 
       def name
-        'ai_sso'
+        'sso'
       end
 
       def info_from_ticket

test/omniauth/strategies/sso_test.rb

+require 'test_helper'
+require 'omniauth'
+require 'rack/test'
+require 'omniauth/strategies/sso'
+
+class OmniAuth::Strategies::SSOTest < Minitest::Test
+  include OmniAuth::Test::StrategyTestCase
+  include Rack::Test::Methods
+
+  def strategy
+    [OmniAuth::Strategies::SSO, 'service_id', verify_key]
+  end
+
+  def test_callback
+    post '/auth/sso/callback', t: ticket_string
+    assert auth_hash
+    assert_equal 'sso', auth_hash['provider']
+    assert_equal 'ale@sso.net', auth_hash['uid']
+    assert_equal 'ale@sso.net', auth_hash['info'].email
+    assert_equal 'ale', auth_hash['info'].name
+  end
+
+  def test_invalid_callback
+    post '/auth/my_strategy/callback', t: invalid_ticket_string
+    assert_nil auth_hash
+  end
+
+  def auth_hash
+    last_request.env['omniauth.auth']
+  end
+
+  def verify_key
+    'c0dadbb483765b055d4f9ff5554d92b3ed7a433f15f4d8ebabbbd072510bfe23'
+  end
+
+  def ticket_string
+    '4bHHseETK5U9YblImiqUpPHnEktAHIlICzb8w6jfrcrDyj/y7EtWoFVTvmTPcpJKHdh7TPPYgEVHVFH4DwKsCDN8YWxlfHNlcnZpY2UvfHNzby5uZXR8MTQxNTU3NDg0NHw='
+  end
+
+  def invalid_ticket_string
+    '4bHHseETK5U9YblImiqUpPHnEktAHIlICzb8w6jfrcrDyj/y7EtWoFVTvmTPcpJKHdh7TPPYgEVHVFH4DwKsCDN8YWxlfHNlcnZpY2UvfHNzby5invalidQxNTU3NDg1NHw='
+  end
+end