Use separate DB in tests and remove separate connection option

Since we'll use separate DBs for test, there's no need to run all tests
with a separate connection.

.github/workflows/main.yml

@@ -53,5 +53,3 @@ jobs:
           bin/rails db:setup
       - name: Run tests
         run: bin/rails test
-      - name: Run tests with separate connection
-        run: SEPARATE_CONNECTION=1 bin/rails test

test/dummy/config/application.rb

@@ -28,9 +28,5 @@ class Application < Rails::Application
     # config.eager_load_paths << Rails.root.join("extras")
 
     config.active_job.queue_adapter = :solid_queue
-
-    if ENV["SEPARATE_CONNECTION"] && ENV["TARGET_DB"] != "sqlite"
-      config.solid_queue.connects_to = { database: { writing: :primary, reading: :replica } }
-    end
   end
 end

test/dummy/config/environments/test.rb

@@ -47,6 +47,10 @@
   # Raises error for missing translations.
   # config.i18n.raise_on_missing_translations = true
 
+  # Replace the default in-process and non-durable queuing backend for Active Job.
+  config.active_job.queue_adapter = :solid_queue
+  config.solid_queue.connects_to = { database: { writing: :queue } }
+
   # Annotate rendered view with file names.
   # config.action_view.annotate_rendered_view_with_filenames = true
 

test/models/solid_queue/job_test.rb

@@ -249,21 +249,19 @@ class NonOverlappingGroupedJob2 < NonOverlappingJob
     end
   end
 
-  if ENV["SEPARATE_CONNECTION"] && ENV["TARGET_DB"] != "sqlite"
-    test "uses a different connection and transaction than the one in use when connects_to is specified" do
-      assert_difference -> { SolidQueue::Job.count } do
-        assert_no_difference -> { JobResult.count } do
-          JobResult.transaction do
-            JobResult.create!(queue_name: "default", value: "this will be rolled back")
-            StoreResultJob.perform_later("enqueued inside a rolled back transaction")
-            raise ActiveRecord::Rollback
-          end
+  test "enqueue successfully inside a rolled-back transaction in the app DB" do
+    assert_difference -> { SolidQueue::Job.count } do
+      assert_no_difference -> { JobResult.count } do
+        JobResult.transaction do
+          JobResult.create!(queue_name: "default", value: "this will be rolled back")
+          StoreResultJob.perform_later("enqueued inside a rolled back transaction")
+          raise ActiveRecord::Rollback
         end
       end
-
-      job = SolidQueue::Job.last
-      assert_equal "enqueued inside a rolled back transaction", job.arguments.dig("arguments", 0)
     end
+
+    job = SolidQueue::Job.last
+    assert_equal "enqueued inside a rolled back transaction", job.arguments.dig("arguments", 0)
   end
 
   private