Add Kerberos SPNEGO request tests

spec/requests/omniauth_kerberos_spnego_spec.rb

+require "spec_helper"
+
+describe 'OmniAuth Kerberos SPNEGO', lib: true do
+  let(:path) { '/users/auth/kerberos_spnego/negotiate' }
+  let(:controller_class) { OmniauthKerberosSpnegoController }
+
+  it 'asks for an SPNEGO token' do
+    get path
+
+    expect(response.status).to eq(401)
+    expect(response.header['Www-Authenticate']).to eq('Negotiate')
+  end
+
+  context 'when an SPNEGO token is provided' do
+    it 'passes the token to spnego_negotiate!' do
+      expect_any_instance_of(controller_class).to receive(:spnego_credentials!).
+        with('fake spnego token')
+
+      get path, {}, spnego_header
+    end
+  end
+
+  context 'when the final SPNEGO token is provided' do
+    before do
+      expect_any_instance_of(controller_class).to receive(:spnego_credentials!).
+        with('fake spnego token').and_return('janedoe@EXAMPLE.COM')
+    end
+
+    it 'redirects to the omniauth callback' do
+      get path, {}, spnego_header
+
+      expect(response).to redirect_to('/users/auth/kerberos_spnego/callback')
+    end
+
+    it 'stores the users principal name in the session' do
+      get path, {}, spnego_header
+
+      expect(session[:kerberos_spnego_principal_name]).to eq('janedoe@EXAMPLE.COM')
+    end
+
+    it 'send the final SPNEGO response' do
+      allow_any_instance_of(controller_class).to receive(:spnego_response_token).
+        and_return("it's the final token")
+
+      get path, {}, spnego_header
+
+      expect(response.header['Www-Authenticate']).to eq(
+        "Negotiate #{Base64.strict_encode64("it's the final token")}"
+      )
+    end
+  end
+
+  def spnego_header
+    { 'HTTP_AUTHORIZATION' => "Negotiate #{Base64.strict_encode64('fake spnego token')}" }
+  end
+end