Move "I should see Crowd login form" feature to a view spec

We were doing all kinds of code gymnastics to "enable" Crowd in the
feature spec and this would sometimes cause a transient failure.

Really what it's testing is if the Crowd login form shows when Crowd's
enabled, so this is much better suited to a view spec.

app/helpers/auth_helper.rb

@@ -6,6 +6,10 @@ module AuthHelper
     Gitlab.config.ldap.enabled
   end
 
+  def omniauth_enabled?
+    Gitlab.config.omniauth.enabled
+  end
+
   def provider_has_icon?(name)
     PROVIDERS_WITH_ICONS.include?(name.to_s)
   end

app/views/devise/sessions/new.html.haml

@@ -4,7 +4,7 @@
     = render 'devise/shared/signin_box'
 
   -# Omniauth fits between signin/ldap signin and signup and does not have a surrounding box
-  - if Gitlab.config.omniauth.enabled && devise_mapping.omniauthable?
+  - if omniauth_enabled? && devise_mapping.omniauthable?
     .clearfix.prepend-top-20
       = render 'devise/shared/omniauth_box'
 
@@ -14,6 +14,6 @@
       = render 'devise/shared/signup_box'
 
   -# Show a message if none of the mechanisms above are enabled
-  - if !signin_enabled? && !ldap_enabled? && !(Gitlab.config.omniauth.enabled && devise_mapping.omniauthable?)
+  - if !signin_enabled? && !ldap_enabled? && !(omniauth_enabled? && devise_mapping.omniauthable?)
     %div
       No authentication methods configured.

features/login_form.feature

-Feature: Login form
-  Scenario: I see Crowd form
-    Given Crowd integration enabled
-    When I visit sign in page
-    Then I should see Crowd login form
-
-  Scenario: I see Crowd form when sign-in is disabled
-    Given Crowd integration enabled
-    And Sign-in is disabled
-    When I visit sign in page
-    Then I should see Crowd login form

features/steps/login_form.rb

-class Spinach::Features::LoginForm < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedPaths
-  include SharedSnippet
-  include SharedUser
-  include SharedSearch
-
-  step 'Sign-in is disabled' do
-    allow_any_instance_of(ApplicationHelper).to receive(:signin_enabled?).and_return(false)
-  end
-
-  step 'Crowd integration enabled' do
-    expect(Gitlab::OAuth::Provider).to receive(:providers).and_return([:crowd])
-    expect(Gitlab.config.omniauth).to receive(:enabled).and_return(true)
-    allow_any_instance_of(ApplicationHelper).to receive(:user_omniauth_authorize_path).and_return(root_path)
-  end
-
-  step 'I should see Crowd login form' do
-    expect(page).to have_selector '#tab-crowd form'
-  end
-
-  step 'I visit sign in page' do
-    visit new_user_session_path
-  end
-end

spec/views/devise/shared/_signin_box.html.haml_spec.rb

+require 'rails_helper'
+
+describe 'devise/shared/_signin_box' do
+  describe 'Crowd form' do
+    before do
+      stub_devise
+      assign(:ldap_servers, [])
+    end
+
+    it 'is shown when Crowd is enabled' do
+      enable_crowd
+
+      render
+
+      expect(rendered).to have_selector('#tab-crowd form')
+    end
+
+    it 'is not shown when Crowd is disabled' do
+      render
+
+      expect(rendered).not_to have_selector('#tab-crowd')
+    end
+  end
+
+  def stub_devise
+    allow(view).to receive(:devise_mapping).and_return(Devise.mappings[:user])
+    allow(view).to receive(:resource).and_return(spy)
+    allow(view).to receive(:resource_name).and_return(:user)
+  end
+
+  def enable_crowd
+    allow(view).to receive(:form_based_providers).and_return([:crowd])
+    allow(view).to receive(:crowd_enabled?).and_return(true)
+    allow(view).to receive(:user_omniauth_authorize_path).with('crowd').
+      and_return('/crowd')
+  end
+end