Added specs for new validations

spec/factories/course_condition_achievements.rb

@@ -3,5 +3,6 @@
           class: Course::Condition::Achievement.name, aliases: [:achievement_condition] do
     course
     achievement
+    association :conditional, factory: :course_achievement
   end
 end

spec/factories/course_condition_levels.rb

@@ -3,5 +3,6 @@
           class: Course::Condition::Level.name, aliases: [:level_condition] do
     course
     minimum_level 1
+    association :conditional, factory: :course_level
   end
 end

spec/features/course/achievement_listing_spec.rb

@@ -1,7 +1,6 @@
 require 'rails_helper'
 
-RSpec.describe 'Course: Achievements', type: :feature do
-  subject { page }
+RSpec.feature 'Course: Achievements' do
 
   let!(:instance) { create(:instance) }
 
@@ -20,8 +19,8 @@
       visit course_achievements_path(course)
     end
 
-    context 'management buttons' do
-      it { is_expected.to have_link(nil, href: new_course_achievement_path(course)) }
+    it 'management buttons' do
+      expect(page).to have_link(nil, href: new_course_achievement_path(course))
     end
 
     it 'shows all achievements' do

spec/features/course/achievement_management_spec.rb

@@ -84,22 +84,60 @@
         end
       end
 
-      scenario 'I can create an achievement condition' do
-        achievement = create(:course_achievement, course: course)
-        visit edit_course_achievement_path(course, achievement)
-        condition_achievement = create(:course_achievement, course: course)
-        expect(page).to have_selector(:link_or_button,
-                                      I18n.t('course.condition.achievements.new.header'))
-        click_link I18n.t('course.condition.achievements.new.header')
-        expect(current_path).
-          to eq(new_course_achievement_condition_achievement_path(course, achievement))
-        find('#condition_achievement_achievement_id').
-          find(:css, "option[value='#{condition_achievement.id}']").
-          select_option
-        click_button I18n.t('helpers.submit.condition_achievement.create')
-        expect(current_path).to eq edit_course_achievement_path(course, achievement)
-        expect(page).to have_selector('tr.condition > td:nth-child(2)',
-                                      text: condition_achievement.title)
+      describe 'I can create an achievement condition' do
+        scenario 'if there is a valid achievement which can serve as a condition' do
+          achievement = create(:course_achievement, course: course)
+          visit edit_course_achievement_path(course, achievement)
+          condition_achievement = create(:course_achievement, course: course)
+          expect(page).to have_selector(:link,
+                                        I18n.t('course.condition.achievements.new.header'))
+          click_link I18n.t('course.condition.achievements.new.header')
+          expect(current_path).
+            to eq(new_course_achievement_condition_achievement_path(course, achievement))
+          find('#condition_achievement_achievement_id').
+            find(:css, "option[value='#{condition_achievement.id}']").
+            select_option
+          click_button I18n.t('helpers.submit.condition_achievement.create')
+          expect(current_path).to eq edit_course_achievement_path(course, achievement)
+          expect(page).to have_selector('tr.condition > td:nth-child(2)',
+                                        text: condition_achievement.title)
+        end
+
+        scenario 'unless there are no valid achievements' do
+          Course::Condition::Achievement.destroy_all
+          Course::Achievement.destroy_all
+          achievement = create(:course_achievement, course: course)
+          visit edit_course_achievement_path(course, achievement)
+
+          # The creation link won't be shown
+          expect(page).not_to have_selector(:link,
+                                            I18n.t('course.condition.achievements.new.header'))
+        end
+
+        scenario 'unless it has already been added or is the current one' do
+          _, achievement, other_achievement = create_achievement_condition
+          visit edit_course_achievement_path(course, achievement)
+          click_link I18n.t('course.condition.achievements.new.header')
+          expect(page).not_to have_selector('condition_achievement_achievement_id >' \
+            "option[value='#{other_achievement.id}']")
+          expect(page).not_to have_selector('#condition_achievement_achievement_id >' \
+            "option[value='#{achievement.id}']")
+        end
+
+        scenario 'unless no achievement was selected' do
+          achievement = create(:course_achievement, course: course)
+          visit edit_course_achievement_path(course, achievement)
+          click_link I18n.t('course.condition.achievements.new.header')
+          expect(current_path).
+            to eq(new_course_achievement_condition_achievement_path(course, achievement))
+          find('#condition_achievement_achievement_id').
+            find(:css, "option[value='']").select_option
+          click_button I18n.t('helpers.submit.condition_achievement.create')
+          expect(current_path).
+            to eq(course_achievement_condition_achievements_path(course.id, achievement.id))
+          expect(page).
+            to have_text(I18n.t('course.condition.errors.none_selected'))
+        end
       end
 
       scenario 'I can edit an achievement condition' do

spec/models/course/condition/achievement_spec.rb

@@ -2,4 +2,39 @@
 
 RSpec.describe Course::Condition::Achievement, type: :model do
   it { is_expected.to act_as(:condition).class_name(Course::Condition.name) }
+  it { is_expected.to respond_to(:name) }
+
+  let!(:instance) { create(:instance) }
+  with_tenant(:instance) do
+
+    let(:course) { create(:course) }
+
+    describe 'validations' do
+      it 'is invalid without an achievement' do
+        expect(subject.valid?).to be_falsey
+      end
+      it 'is invalid when its achievement is its conditional, causing a circular reference' do
+        conditional = create(:course_achievement, course: course)
+        subject.achievement = conditional
+        subject.conditional = conditional
+        expect(subject.valid?).to be_falsey
+      end
+      it "is invalid when its achievement is included in its conditional's conditions" do
+        achievement = create(:course_achievement, course: course)
+        condition = create(:course_condition_achievement, course: course,
+                           achievement: achievement)
+        conditional = create(:course_achievement, course: course, conditions: [condition])
+        subject.conditional = conditional
+        subject.achievement = achievement
+        expect(subject.valid?).to be_falsey
+      end
+    end
+
+    describe '#name' do
+      it 'returns the title of the achievement' do
+        subject.achievement = create(:course_achievement, course: course)
+        expect(subject.name).to eq(subject.achievement.title)
+      end
+    end
+  end
 end

spec/models/course/condition/level_spec.rb

@@ -2,4 +2,10 @@
 
 RSpec.describe Course::Condition::Level, type: :model do
   it { is_expected.to act_as(:condition).class_name(Course::Condition.name) }
+  it { is_expected.to respond_to(:name) }
+
+  it do
+    subject.minimum_level = 10
+    expect(subject.name).to eq('Level 10')
+  end
 end