more readable specs for enabled_button_based_providers and button_based_providers_enabled?

spec/helpers/auth_helper_spec.rb

@@ -23,11 +23,14 @@ describe AuthHelper do
       allow(helper).to receive(:auth_providers) { [:twitter, :github] }
     end
 
+    context 'all providers are enabled to sign in' do
       it 'returns all the enabled providers from settings' do
-      expect(helper.enabled_button_based_providers).to include(*['twitter', 'github'])
+        expect(helper.enabled_button_based_providers).to include('twitter', 'github')
+      end
     end
 
-    it "should not return github as provider because it's disabled from settings" do
+    context 'GitHub OAuth sign in is disabled from application setting' do
+      it "doesn't return github as provider" do
         stub_application_setting(
           disabled_oauth_sign_in_sources: ['github']
         )
@@ -35,12 +38,22 @@ describe AuthHelper do
         expect(helper.enabled_button_based_providers).to include('twitter')
         expect(helper.enabled_button_based_providers).to_not include('github')
       end
+    end
+  end
 
-    it 'returns true for button_based_providers_enabled? because there providers' do
+  describe 'button_based_providers_enabled?' do
+    before do
+      allow(helper).to receive(:auth_providers) { [:twitter, :github] }
+    end
+
+    context 'button based providers enabled' do
+      it 'returns true' do
         expect(helper.button_based_providers_enabled?).to be true
       end
+    end
 
-    it 'returns false for button_based_providers_enabled? because there providers' do
+    context 'all the button based providers are disabled via application_setting' do
+      it 'returns false' do
         stub_application_setting(
           disabled_oauth_sign_in_sources: ['github', 'twitter']
         )
@@ -48,4 +61,5 @@ describe AuthHelper do
         expect(helper.button_based_providers_enabled?).to be false
       end
     end
+  end
 end