Fix error where helper was incorrectly returning `true`

Helper was incorrectly returning `true` when user was moving from Step 2
(Lead generation) to Step 3 (Selection of namespace). When landing at
Step 3. `trial_result` is `nil` so helper show return `false`.

changelogs/unreleased/rd-fix-show-trial-errors-helper.yml

+---
+title: Fix error where helper was incorrectly returning `true`
+merge_request: 18231
+author:
+type: fixed

ee/app/controllers/trials_controller.rb

@@ -17,9 +17,9 @@ class TrialsController < ApplicationController
   end
 
   def create_lead
-    @lead_result = GitlabSubscriptions::CreateLeadService.new.execute({ trial_user: company_params })
+    @result = GitlabSubscriptions::CreateLeadService.new.execute({ trial_user: company_params })
 
-    if @lead_result[:success]
+    if @result[:success]
       redirect_to select_trials_url
     else
       render :new
@@ -29,9 +29,9 @@ class TrialsController < ApplicationController
   def apply
     return render(:select) if @namespace.invalid?
 
-    @trial_result = GitlabSubscriptions::ApplyTrialService.new.execute(apply_trial_params)
+    @result = GitlabSubscriptions::ApplyTrialService.new.execute(apply_trial_params)
 
-    if @trial_result&.dig(:success)
+    if @result&.dig(:success)
       redirect_to group_url(@namespace, { trial: true })
     else
       render :select

ee/app/helpers/ee/trial_helper.rb

@@ -26,12 +26,12 @@ module EE
       grouped_options_for_select(grouped_options, nil, prompt: _('Please select'))
     end
 
-    def show_trial_errors?(namespace, trial_result)
-      namespace&.invalid? || !trial_result&.dig(:success)
+    def show_trial_errors?(namespace, service_result)
+      namespace&.invalid? || (service_result && !service_result[:success])
     end
 
-    def trial_errors(namespace, trial_result)
-      namespace&.errors&.full_messages&.to_sentence&.presence || trial_result&.dig(:errors)&.presence
+    def trial_errors(namespace, service_result)
+      namespace&.errors&.full_messages&.to_sentence&.presence || service_result&.dig(:errors)&.presence
     end
   end
 end

ee/app/views/trials/_errors.html.haml

+- if show_trial_errors?(@namespace, @result)
+  .flash-container
+    .flash-alert.text-center
+      = _('We have found the following errors:')
+      .flash-text
+        = trial_errors(@namespace, @result)

ee/app/views/trials/new.html.haml

@@ -6,12 +6,7 @@
 %p.center
   = _('We need some additional information to activate your free trial')
 
-- if @lead_result&.dig(:errors).present?
-  .flash-container
-    .flash-alert.text-center
-      = _('We have found the following errors:')
-      .flash-text
-        = @lead_result[:errors]
+= render 'errors'
 
 = form_tag create_lead_trials_path, method: :post do |f|
   .form-group

ee/app/views/trials/select.html.haml

@@ -6,12 +6,7 @@
 %p.center
   = _('You can apply your Trial to your Personal account or create a New Group.')
 
-- if show_trial_errors?(@namespace, @trial_result)
-  .flash-container
-    .flash-alert.text-center
-      = _('We have found the following errors:')
-      .flash-text
-        = trial_errors(@namespace, @trial_result)
+= render 'errors'
 
 = form_tag apply_trials_path, method: :post do
   .form-group

ee/spec/helpers/ee/trial_helper_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe EE::TrialHelper do
+  using RSpec::Parameterized::TableSyntax
+
+  describe '#show_trial_errors?' do
+    where(:namespace, :trial_result, :expected_result) do
+      nil                              | { success: true }  | false
+      nil                              | nil                | nil
+      build(:namespace)                | nil                | nil
+      build(:namespace)                | { success: true }  | false
+      build(:namespace, name: 'admin') | { success: true }  | true
+      nil                              | { success: false } | true
+      build(:namespace)                | { success: false } | true
+    end
+
+    with_them do
+      it 'show errors when Namespace is invalid or Trial generation was unsuccessful' do
+        expect(helper.show_trial_errors?(namespace, trial_result)).to eq(expected_result)
+      end
+    end
+  end
+end