tests: add misc controller tests.

test/functional/admin/dashboards_controller_test.rb

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+require 'test_helper'
+
+class Admin::DashboardsControllerTest < ActionController::TestCase
+  context "The admin dashboard controller" do
+    context "show action" do
+      should "render" do
+        get :show
+        assert_response :success
+      end
+    end
+  end
+end

test/functional/artist_commentary_versions_controller_test.rb

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+require 'test_helper'
+
+class ArtistCommentaryVersionsControllerTest < ActionController::TestCase
+  context "The artist commentary versions controller" do
+    context "index action" do
+      should "render" do
+        get :index
+        assert_response :success
+      end
+    end
+  end
+end

test/functional/counts_controller_test.rb

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+require 'test_helper'
+
+class CountsControllerTest < ActionController::TestCase
+  context "The counts commentary controller" do
+    context "posts action" do
+      should "render" do
+        get :posts
+        assert_response :success
+      end
+    end
+  end
+end

test/functional/delayed_jobs_controller_test.rb

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+require 'test_helper'
+
+class DelayedJobsControllerTest < ActionController::TestCase
+  context "The delayed jobs controller" do
+    context "index action" do
+      should "render" do
+        get :index
+        assert_response :success
+      end
+    end
+  end
+end

test/functional/dtext_previews_controller_test.rb

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+require 'test_helper'
+
+class DtextPreviewsControllerTest < ActionController::TestCase
+  context "The dtext previews controller" do
+    context "create action" do
+      should "render" do
+        post :create, { body: "h1. Touhou\n\n* [[touhou]]" }
+        assert_response :success
+      end
+    end
+  end
+end