diff --git a/.gitignore b/.gitignore
index f641c69..bb38e0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,9 @@
 Gemfile.lock
 *.gem
+.rspec_status
+/coverage/
 /spec/dummy/log/
 /spec/dummy/tmp/
+/spec/dummy/csv/
+/spec/dummy/db/development.sqlite3
+/spec/dummy/db/test.sqlite3
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..34c5164
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,3 @@
+--format documentation
+--color
+--require spec_helper
diff --git a/.rubocop.yml b/.rubocop.yml
index ff25bf7..f424edc 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -30,3 +30,15 @@ Naming/FileName:
 Style/EvalWithLocation:
   Exclude:
     - lib/active_admin/async_exporter/reports/worker.rb
+
+Style/StringLiterals:
+  Exclude:
+    - spec/dummy/db/schema.rb
+
+Style/NumericLiterals:
+  Exclude:
+    - spec/dummy/db/schema.rb
+
+Layout/EmptyLinesAroundBlockBody:
+  Exclude:
+    - spec/dummy/db/schema.rb
diff --git a/activeadmin-async_exporter.gemspec b/activeadmin-async_exporter.gemspec
index d4020dd..a348748 100644
--- a/activeadmin-async_exporter.gemspec
+++ b/activeadmin-async_exporter.gemspec
@@ -23,10 +23,10 @@ Gem::Specification.new do |s|
   s.add_dependency 'rails', '>= 1.0.0'
 
   # Development dependencies
+  s.add_development_dependency 'pry-rails', '~> 0.3.9'
   s.add_development_dependency 'rspec', '~> 3.9.0'
   s.add_development_dependency 'rubocop-rails', '~> 2.3'
   s.add_development_dependency 'rubocop-rootstrap', '~> 0.1.0'
   s.add_development_dependency 'simplecov', '~> 0.17.1'
   s.add_development_dependency 'sqlite3', '1.4.1'
-  s.add_development_dependency 'pry-rails'
 end
diff --git a/lib/active_admin/async_exporter/config.rb b/lib/active_admin/async_exporter/config.rb
index 854a8df..d50ae0d 100644
--- a/lib/active_admin/async_exporter/config.rb
+++ b/lib/active_admin/async_exporter/config.rb
@@ -18,7 +18,7 @@ class Config
       def initialize
         @aws_bucket_name = nil
         @aws_bucket_folder_path = nil
-        @disk_folder_path = nil
+        @disk_folder_path = Rails.root.join('tmp/activeadmin-async_exporter')
       end
     end
   end
diff --git a/lib/active_admin/async_exporter/reports/worker.rb b/lib/active_admin/async_exporter/reports/worker.rb
index c60cae1..d2d82f1 100644
--- a/lib/active_admin/async_exporter/reports/worker.rb
+++ b/lib/active_admin/async_exporter/reports/worker.rb
@@ -15,7 +15,7 @@ def perform(options = {})
         end
 
         file = Services::StorageService.call(path: path, name: file_name).store
-        AdminReport.find(options[:admin_report_id]).update_attributes!(
+        AdminReport.find(options[:admin_report_id]).update!(
           status: :ready,
           location_url: file.url
         )
diff --git a/spec/dummy/config/application.rb b/spec/dummy/config/application.rb
index 499e4fe..e9bb31e 100644
--- a/spec/dummy/config/application.rb
+++ b/spec/dummy/config/application.rb
@@ -10,6 +10,7 @@
 require 'action_view/railtie'
 require 'sprockets/railtie'
 require 'active_storage/engine'
+require 'pry'
 
 Bundler.require(*Rails.groups)
 
diff --git a/spec/dummy/db/migrate/20200925172213_create_user.rb b/spec/dummy/db/migrate/20200925172213_create_user.rb
new file mode 100644
index 0000000..ac162f2
--- /dev/null
+++ b/spec/dummy/db/migrate/20200925172213_create_user.rb
@@ -0,0 +1,7 @@
+class CreateUser < ActiveRecord::Migration[5.2]
+  def change
+    create_table :users do |t|
+      t.string :username, null: false
+    end
+  end
+end
diff --git a/spec/dummy/db/schema.rb b/spec/dummy/db/schema.rb
new file mode 100644
index 0000000..b151eb5
--- /dev/null
+++ b/spec/dummy/db/schema.rb
@@ -0,0 +1,30 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 2020_09_25_172213) do
+
+  create_table "admin_reports", force: :cascade do |t|
+    t.integer "author_id"
+    t.string "entity", null: false
+    t.string "format", default: "csv", null: false
+    t.integer "status", null: false
+    t.string "location_url"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["author_id"], name: "index_admin_reports_on_author_id"
+  end
+
+  create_table "users", force: :cascade do |t|
+    t.string "username", null: false
+  end
+
+end
diff --git a/spec/fixtures/files/block.csv b/spec/fixtures/files/block.csv
new file mode 100644
index 0000000..406399e
--- /dev/null
+++ b/spec/fixtures/files/block.csv
@@ -0,0 +1,5 @@
+test_block
+The username is: user_1
+The username is: user_2
+The username is: user_3
+The username is: AdminUser
diff --git a/spec/fixtures/files/username.csv b/spec/fixtures/files/username.csv
new file mode 100644
index 0000000..db64234
--- /dev/null
+++ b/spec/fixtures/files/username.csv
@@ -0,0 +1,5 @@
+username
+user_1
+user_2
+user_3
+AdminUser
diff --git a/spec/fixtures/files/username_and_block.csv b/spec/fixtures/files/username_and_block.csv
new file mode 100644
index 0000000..e0b022b
--- /dev/null
+++ b/spec/fixtures/files/username_and_block.csv
@@ -0,0 +1,5 @@
+username,test_block
+user_1,The username is: user_1
+user_2,The username is: user_2
+user_3,The username is: user_3
+AdminUser,The username is: AdminUser
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 198ab85..71db309 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,7 +1,16 @@
 # frozen_string_literal: true
 
-require 'bundler/setup'
-require 'activeadmin-async_exporter'
+ENV['RAILS_ENV'] ||= 'test'
+require 'dummy/config/environment.rb'
+require 'active_admin'
+require 'support/time_helpers.rb'
+
+require 'simplecov'
+SimpleCov.start
+
+Rails.application.routes.default_url_options[:host] = 'localhost:3000'
+
+require 'tmpdir'
 
 require 'simplecov'
 SimpleCov.start
diff --git a/spec/support/time_helpers.rb b/spec/support/time_helpers.rb
new file mode 100644
index 0000000..5fbf28e
--- /dev/null
+++ b/spec/support/time_helpers.rb
@@ -0,0 +1,5 @@
+require 'active_support/testing/time_helpers'
+
+RSpec.configure do |config|
+  config.include ActiveSupport::Testing::TimeHelpers
+end
diff --git a/spec/worker_spec.rb b/spec/worker_spec.rb
new file mode 100644
index 0000000..3ef6cb9
--- /dev/null
+++ b/spec/worker_spec.rb
@@ -0,0 +1,140 @@
+RSpec.describe ActiveAdmin::AsyncExporter::Worker do
+  let!(:users) do
+    %w[user_1 user_2 user_3].map do |username|
+      User.find_or_create_by!(username: username)
+    end
+  end
+  let(:controller) { Admin::UsersController.new }
+  let(:decorate_model) { false }
+  let(:file_name) { 'file_name' }
+  let(:query) { nil }
+  let(:csv_path) { Rails.root.join('tmp/activeadmin-async_exporter') }
+  let(:admin) { User.find_or_create_by!(username: 'AdminUser') }
+  let(:csv_fixture_file_path) { "./spec/fixtures/files/#{csv_fixture_file_name}.csv" }
+  let(:csv_fixture_file_name) { 'username' }
+
+  let(:admin_report) do
+    AdminReport.create!(author_id: admin.id,
+                        entity: User.name,
+                        status: :pending)
+  end
+
+  let(:columns) { { username: { block: false, value: 'username' } } }
+
+  let(:options) do
+    {
+      admin_report_id: admin_report.id,
+      controller: controller.class.name,
+      columns: columns,
+      decorate_model: decorate_model,
+      file_name: file_name,
+      query: query
+    }
+  end
+
+  subject do
+    described_class.perform_now(options)
+  end
+
+  context 'with valid options' do
+    let(:test_date) { Time.current }
+    let(:full_file_name) { [file_name, test_date.to_i].join('_') + '.csv' }
+    let(:file_path) { "#{csv_path}/#{full_file_name}" }
+
+    before do
+      travel_to(test_date)
+    end
+
+    after do
+      FileUtils.rm(file_path)
+      travel_back
+    end
+
+    shared_examples 'creates the physical file with data' do
+      it 'creates the physical file at the given location_url' do
+        expect { File.open(admin_report.location_url.to_s) }.to raise_exception(Errno::ENOENT)
+        subject
+        expect(File.open(admin_report.reload.location_url)).to be
+      end
+
+      it 'physical path is the expected' do
+        subject
+        expect(admin_report.reload.location_url).to eq(file_path)
+      end
+
+      it 'physical file contains data' do
+        subject
+        expect(File.open(admin_report.reload.location_url).read).to be
+      end
+
+      it 'generated csv file contains the expected results' do
+        subject
+
+        generated_file_data = File.open(admin_report.reload.location_url).read
+
+        expect(File.open(csv_fixture_file_path).read).to eq(generated_file_data)
+      end
+    end
+
+    it 'changes admin_report status to ready' do
+      expect { subject }.to change { admin_report.reload.status }.from('pending').to('ready')
+    end
+
+    it 'changes admin_report location_url' do
+      expect { subject }.to change { admin_report.reload.location_url }.from(nil).to(file_path)
+    end
+
+    context 'when the file_name is given' do
+      it 'full file name is the correct file name' do
+        subject
+        expect(admin_report.reload.location_url.split('/').last).to eq(full_file_name)
+      end
+
+      it_behaves_like 'creates the physical file with data'
+    end
+
+    context 'when the file_name is not given' do
+      let(:file_name) { nil }
+      let(:full_file_name) do
+        [controller.current_collection.name.pluralize.downcase, test_date.to_i].join('_') + '.csv'
+      end
+
+      it 'full file name is the correct file name' do
+        subject
+        expect(admin_report.reload.location_url.split('/').last).to eq(full_file_name)
+      end
+
+      it_behaves_like 'creates the physical file with data'
+    end
+
+    context 'when the column is an attribute' do
+      it_behaves_like 'creates the physical file with data'
+    end
+
+    context 'when the column is a block' do
+      let(:block) do
+        proc { |user| "The username is: #{user.username}" }
+      end
+      let(:csv_fixture_file_name) { 'block' }
+      let(:columns) { { test_block: { block: true, value: block.source } } }
+
+      it_behaves_like 'creates the physical file with data'
+    end
+
+    context 'when we have multiple columns' do
+      let(:block) do
+        proc { |user| "The username is: #{user.username}" }
+      end
+
+      let(:csv_fixture_file_name) { 'username_and_block' }
+      let(:columns) do
+        {
+          username: { block: false, value: 'username' },
+          test_block: { block: true, value: block.source }
+        }
+      end
+
+      it_behaves_like 'creates the physical file with data'
+    end
+  end
+end