Add problem count changing to the admin dashboard

test/controllers/admin/dashboard_controller_test.rb

@@ -12,4 +12,10 @@ class Admin::DashboardControllerTest < ActionController::TestCase
     assert_response :success
   end
 
+  test "should post new problem count" do
+    post :update_problem_count, problem_count: 15
+    assert_redirected_to controller: 'admin/dashboard', action: 'index'
+    assert_equal 15, Problem.count
+  end
+
 end