Add tests

test/system/activities_test.rb

@@ -0,0 +1,60 @@
+require 'capybara/minitest'
+require 'application_system_test_case'
+
+class ActivitiesTest < ApplicationSystemTestCase
+  include Devise::Test::IntegrationHelpers
+  # Make the Capybara DSL available in all integration tests
+  include Capybara::DSL
+  # Make `assert_*` methods behave like Minitest assertions
+  include Capybara::Minitest::Assertions
+
+  setup do
+    @instance = exercises(:python_exercise)
+    @user = users(:zeus)
+    sign_in @user
+  end
+
+  test 'should show exercise' do
+    visit exercise_path(id: @instance.id)
+    assert_text @instance.name_en
+  end
+
+  test 'should show boilerplate in code editor' do
+    @instance.stubs(:boilerplate).returns('boilerplate') do
+      visit exercise_path(id: @instance.id)
+      assert_text 'boilerplate'
+    end
+  end
+
+  test 'show latest submission in code editor' do
+    create(:submission, exercise: @instance, user: @user, status: :correct, code: 'print("hello")')
+    visit exercise_path(id: @instance.id)
+    assert_text 'print("hello")'
+  end
+
+  test 'should show message to clear editor if latest submission is shown' do
+    create(:submission, exercise: @instance, user: @user, status: :correct, code: 'print("hello")')
+    visit exercise_path(id: @instance.id)
+    assert_text 'Clear editor'
+  end
+
+  test 'should show message to restore boilerplate if latest submission is shown' do
+    @instance.stubs(:boilerplate).returns('boilerplate') do
+      create(:submission, exercise: @instance, user: @user, status: :correct, code: 'print("hello")')
+      visit exercise_path(id: @instance.id)
+      assert_text 'Restore boilerplate'
+    end
+  end
+
+  test 'should not break on complex unicode characters' do
+    @instance.stubs(:boilerplate).returns('`<script>alert("😀")</script>`') do
+      visit exercise_path(id: @instance.id)
+      assert_text '`<script>alert("😀")</script>`'
+
+      create(:submission, exercise: @instance, user: @user, status: :correct, code: 'print("😀")')
+      visit exercise_path(id: @instance.id)
+      assert_text 'print("😀")'
+      assert_text 'Restore boilerplate'
+    end
+  end
+end