add api implementation

test/application_system_test_case.rb

@@ -0,0 +1,5 @@
+require "test_helper"
+
+class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
+  driven_by :selenium, using: :headless_chrome, screen_size: [ 1400, 1400 ]
+end

test/controllers/dashboard_controller_test.rb

@@ -0,0 +1,8 @@
+require "test_helper"
+
+class DashboardControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get dashboard_index_url
+    assert_response :success
+  end
+end

test/test_helper.rb

@@ -0,0 +1,15 @@
+ENV["RAILS_ENV"] ||= "test"
+require_relative "../config/environment"
+require "rails/test_help"
+
+module ActiveSupport
+  class TestCase
+    # Run tests in parallel with specified workers
+    parallelize(workers: :number_of_processors)
+
+    # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
+    fixtures :all
+
+    # Add more helper methods to be used by all tests here...
+  end
+end