Raise exception when specifying undefined auth method

Author: satoryu

lib/net/ldap/auth_adapter.rb

@@ -10,7 +10,11 @@ def self.register(names, adapter)
       end
 
       def self.[](name)
-        @adapters[name]
+        a = @adapters[name]
+        if a.nil?
+          raise Net::LDAP::AuthMethodUnsupportedError, "Unsupported auth method (#{name})"
+        end
+        return a
       end
 
       def initialize(conn)

test/test_auth_adapter.rb

@@ -0,0 +1,11 @@
+require 'test_helper'
+
+class TestAuthAdapter < Test::Unit::TestCase
+  def test_undefined_auth_adapter
+    flexmock(TCPSocket).should_receive(:new).ordered.with('ldap.example.com', 379).once.and_return(nil)
+    conn = Net::LDAP::Connection.new(host: 'ldap.example.com', port: 379)
+    assert_raise Net::LDAP::AuthMethodUnsupportedError, "Unsupported auth method (foo)" do
+      conn.bind(method: :foo)
+    end
+  end
+end