Add tests for categories

spec/models/category_spec.rb

@@ -1,5 +1,46 @@
 require 'rails_helper'
 
-RSpec.describe Category, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+describe Category do
+  context 'validations' do
+    it 'allows a valid category to be created' do
+      category = Category.create(
+        category: Faker::Lorem.word,
+      )
+      expect(category).to be_valid
+    end
+
+    it 'does not allow a category to be saved without a name' do
+      expect(Category.create).not_to be_valid
+    end
+
+    it 'does not allow an empty category to be saved' do
+      expect(Category.create(category: '')).not_to be_valid
+    end
+
+    it 'does not allow a category with a name too long to be saved' do
+      expect(Category.create(category: 'A' * 26)).not_to be_valid
+    end
+  end
+
+  context 'logs modification in moderation log' do
+    let(:edit_user) { create :user }
+
+    it 'logs on create' do
+      expect { Category.create(category: 'new_category', edit_user_id: edit_user.id) }
+        .to change { Moderation.count }.by(1)
+      mod = Moderation.last
+      expect(mod.action).to include 'new_category'
+      expect(mod.action).to start_with 'Created new category'
+      expect(mod.moderator_user_id).to be edit_user.id
+    end
+
+    it 'logs on update' do
+      expect { Category.first.update(category: 'new_category_name', edit_user_id: edit_user.id) }
+        .to change { Moderation.count }.by(1)
+      mod = Moderation.last
+      expect(mod.action).to include 'new_category_name'
+      expect(mod.action).to start_with 'Updating'
+      expect(mod.moderator_user_id).to be edit_user.id
+    end
+  end
 end