update saml controller and views

because of using another gem (saml_idp)

spec/controllers/saml_idp_controller_spec.rb

@@ -1,23 +1,50 @@
 describe SamlIdpController do
+  before do
+    allow_any_instance_of(SamlIdpController).to receive(:validate_saml_request).and_return(valid_saml_request)
+  end
+
   describe '#new' do
     let(:action) { get :new }
 
-    context 'without superadmin connected' do
-      it { expect(action).to redirect_to root_path }
-
-      it "display alert" do
-        action
-        expect(flash[:alert]).to eq("Vous n’êtes pas autorisé à accéder à ce service.")
-      end
+    context 'with invalid saml request' do
+      let(:valid_saml_request) { false }
+      it { expect(action).to have_http_status(:forbidden) }
     end
 
-    context 'with superadmin connected' do
-      let(:superadmin) { create(:super_admin) }
-      before { sign_in superadmin }
+    context 'with valid saml request' do
+      let(:valid_saml_request) { true }
 
-      it 'encode saml response' do
-        expect(subject).to receive(:encode_SAMLResponse).with(superadmin.email, anything())
-        action
+      it { expect(action).to have_http_status(:ok) }
+    end
+  end
+  describe '#create' do
+    let(:action) { post :create }
+
+    context 'with invalid saml request' do
+      let(:valid_saml_request) { false }
+      it { expect(action).to have_http_status(:forbidden) }
+    end
+
+    context 'with valid saml request' do
+      let(:valid_saml_request) { true }
+
+      context 'without superadmin connected' do
+        it { expect(action).to redirect_to root_path }
+
+        it "display alert" do
+          action
+          expect(flash[:alert]).to eq("Vous n’êtes pas autorisé à accéder à ce service.")
+        end
+      end
+
+      context 'with superadmin connected' do
+        let(:superadmin) { create(:super_admin) }
+        before { sign_in superadmin }
+
+        it 'encode saml response' do
+          expect(subject).to receive(:idp_make_saml_response).with(superadmin)
+          action
+        end
       end
     end
   end