Extract LDAP config to seperate class

spec/lib/gitlab/ldap/config_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe Gitlab::LDAP::Config do
+  let(:config) { Gitlab::LDAP::Config.new provider }
+  let(:provider) { 'ldapmain' }
+
+  describe :initalize do
+    it 'requires a provider' do
+      expect{ Gitlab::LDAP::Config.new }.to raise_error ArgumentError
+    end
+
+    it "works" do
+      expect(config).to be_a described_class
+    end
+  end
+end