diff --git a/test/async/service/managed/service.rb b/test/async/service/managed/service.rb
index 4e30395..8fcaa38 100644
--- a/test/async/service/managed/service.rb
+++ b/test/async/service/managed/service.rb
@@ -347,6 +347,8 @@ def name = @name
 	end
 	
 	with "integration test with controller" do
+		include Sus::Fixtures::Async::SchedulerContext
+		
 		let(:configuration) do
 			Async::Service::Configuration.build do
 				service "test-managed" do
@@ -367,14 +369,12 @@ def name = @name
 		it "runs service with health checking and no restarts when async context is present" do
 			container = Async::Container.new
 			
-			begin
-				controller.setup(container)
-				controller.start
-				sleep(0.03)
-			ensure
-				controller.stop
-				container.stop
-			end
+			controller.setup(container)
+			controller.start
+			sleep(0.03)
+		ensure
+			controller.stop
+			container&.stop
 		end
 	end
 end
diff --git a/test/async/service/policy.rb b/test/async/service/policy.rb
index 15aa627..81825b8 100644
--- a/test/async/service/policy.rb
+++ b/test/async/service/policy.rb
@@ -6,6 +6,7 @@
 require "async/container/best"
 require "async/service/policy"
 require "async/container/statistics"
+require "sus/fixtures/async/scheduler_context"
 
 describe Async::Service::Policy do
 	let(:policy) {subject.new(maximum_failures: 5, window: 10)}
@@ -160,9 +161,17 @@ def success_status.success?; true; end
 	end
 	
 	with "concurrent failures" do
+		include Sus::Fixtures::Async::SchedulerContext
+		
 		it "only stops container once when multiple children fail simultaneously" do
 			container = Async::Container.best_container_class.new(policy: policy)
-			expect(container).to receive(:stop)
+			stop_count = 0
+			original_stop = container.method(:stop)
+			
+			container.define_singleton_method(:stop) do |*arguments|
+				stop_count += 1
+				original_stop.call(*arguments)
+			end
 			
 			# Spawn 10 children that all fail immediately:
 			10.times do |i|
@@ -173,6 +182,8 @@ def success_status.success?; true; end
 			end
 			
 			container.wait
+			
+			expect(stop_count).to be == 1
 		end
 	end
 end