Use system specs instead of feature specs

We get rid of database cleaner, and JavaScript tests are faster because
between tests we now rollback transactions instead of truncating the
database.

spec/system/admin/moderators_spec.rb

@@ -0,0 +1,84 @@
+require "rails_helper"
+
+describe "Admin moderators" do
+  let!(:user)      { create(:user, username: "Jose Luis Balbin") }
+  let!(:moderator) { create(:moderator) }
+
+  before do
+    login_as(create(:administrator).user)
+    visit admin_moderators_path
+  end
+
+  scenario "Index" do
+    expect(page).to have_content moderator.name
+    expect(page).to have_content moderator.email
+    expect(page).not_to have_content user.name
+  end
+
+  scenario "Create Moderator", :js do
+    fill_in "name_or_email", with: user.email
+    click_button "Search"
+
+    expect(page).to have_content user.name
+    click_link "Add"
+    within("#moderators") do
+      expect(page).to have_content user.name
+    end
+  end
+
+  scenario "Delete Moderator" do
+    click_link "Delete"
+
+    within("#moderators") do
+      expect(page).not_to have_content moderator.name
+    end
+  end
+
+  context "Search" do
+    let(:user)        { create(:user, username: "Elizabeth Bathory", email: "elizabeth@bathory.com") }
+    let(:user2)       { create(:user, username: "Ada Lovelace", email: "ada@lovelace.com") }
+    let!(:moderator1) { create(:moderator, user: user) }
+    let!(:moderator2) { create(:moderator, user: user2) }
+
+    before do
+      visit admin_moderators_path
+    end
+
+    scenario "returns no results if search term is empty" do
+      expect(page).to have_content(moderator1.name)
+      expect(page).to have_content(moderator2.name)
+
+      fill_in "name_or_email", with: " "
+      click_button "Search"
+
+      expect(page).to have_content("Moderators: User search")
+      expect(page).to have_content("No results found")
+      expect(page).not_to have_content(moderator1.name)
+      expect(page).not_to have_content(moderator2.name)
+    end
+
+    scenario "search by name" do
+      expect(page).to have_content(moderator1.name)
+      expect(page).to have_content(moderator2.name)
+
+      fill_in "name_or_email", with: "Eliz"
+      click_button "Search"
+
+      expect(page).to have_content("Moderators: User search")
+      expect(page).to have_content(moderator1.name)
+      expect(page).not_to have_content(moderator2.name)
+    end
+
+    scenario "search by email" do
+      expect(page).to have_content(moderator1.email)
+      expect(page).to have_content(moderator2.email)
+
+      fill_in "name_or_email", with: moderator2.email
+      click_button "Search"
+
+      expect(page).to have_content("Moderators: User search")
+      expect(page).to have_content(moderator2.email)
+      expect(page).not_to have_content(moderator1.email)
+    end
+  end
+end