`ActiveJob::QueueAdapters::*` are no longer singletons

3 files changed, 26 insertions, 2 deletions

diff --git a/activejob/test/cases/adapter_test.rb b/activejob/test/cases/adapter_test.rb
index f0c710f9ed..6d75ae9a7c 100644
--- a/activejob/test/cases/adapter_test.rb
+++ b/activejob/test/cases/adapter_test.rb
@@ -2,6 +2,6 @@ require 'helper'
 
 class AdapterTest < ActiveSupport::TestCase
   test "should load #{ENV['AJ_ADAPTER']} adapter" do
-    assert_equal "active_job/queue_adapters/#{ENV['AJ_ADAPTER']}_adapter".classify, ActiveJob::Base.queue_adapter.name
+    assert_equal "active_job/queue_adapters/#{ENV['AJ_ADAPTER']}_adapter".classify, ActiveJob::Base.queue_adapter.class.name
   end
 end
diff --git a/activejob/test/cases/queue_adapter_test.rb b/activejob/test/cases/queue_adapter_test.rb
new file mode 100644
index 0000000000..d801a0852c
--- /dev/null
+++ b/activejob/test/cases/queue_adapter_test.rb
@@ -0,0 +1,24 @@
+require 'helper'
+
+class QueueAdapterTest < ActiveJob::TestCase
+  test 'should forbid nonsense arguments' do
+    assert_raises(ArgumentError) { ActiveJob::Base.queue_adapter = Mutex }
+    assert_raises(ArgumentError) { ActiveJob::Base.queue_adapter = Mutex.new }
+  end
+
+  test 'should warn on passing an adapter class' do
+    klass = Class.new do
+      def self.name
+        'fake'
+      end
+
+      def enqueue(*)
+      end
+
+      def enqueue_at(*)
+      end
+    end
+
+    assert_deprecated { ActiveJob::Base.queue_adapter = klass }
+  end
+end
diff --git a/activejob/test/cases/test_case_test.rb b/activejob/test/cases/test_case_test.rb
index 7d1702990e..bd23878b23 100644
--- a/activejob/test/cases/test_case_test.rb
+++ b/activejob/test/cases/test_case_test.rb
@@ -9,6 +9,6 @@ class ActiveJobTestCaseTest < ActiveJob::TestCase
   end
 
   def test_set_test_adapter
-    assert_equal ActiveJob::QueueAdapters::TestAdapter, self.queue_adapter
+    assert_kind_of ActiveJob::QueueAdapters::TestAdapter, self.queue_adapter
   end
 end