Hack in registration prevention (#37)

Reviewed-on: #37

test/controllers/users_controller_test.rb

@@ -17,15 +17,17 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "should create user" do
-    assert_difference("User.count") do
-      params = {
-        user: {
-          email: "userthree@example.local",
-          password: "secret",
-          password_confirmation: "secret"
+    stub_environment(REGISTRATION_ALLOWED: "true") do
+      assert_difference("User.count") do
+        params = {
+          user: {
+            email: "userthree@example.local",
+            password: "secret",
+            password_confirmation: "secret"
+          }
         }
-      }
-      post users_url, params: params
+        post users_url, params: params
+      end
     end
 
     assert_redirected_to user_url(User.last)