Add sus/fixtures/async to relevant test files.

Author: ioquatix

test/async/scheduler/address.rb

@@ -4,6 +4,7 @@
 # Copyright, 2021-2022, by Samuel Williams.
 
 require 'async/scheduler'
+require 'sus/fixtures/async'
 
 describe Async::Scheduler do
 	include Sus::Fixtures::Async::ReactorContext

test/async/scheduler/condition_variable.rb

@@ -4,6 +4,7 @@
 # Copyright, 2021-2022, by Samuel Williams.
 
 require 'async/scheduler'
+require 'sus/fixtures/async'
 
 describe Async::Scheduler do
 	include Sus::Fixtures::Async::ReactorContext

test/async/scheduler/io.rb

@@ -4,6 +4,7 @@
 # Copyright, 2021-2022, by Samuel Williams.
 
 require 'async/scheduler'
+require 'sus/fixtures/async'
 require 'io/nonblock'
 
 describe Async::Scheduler do

test/async/scheduler/kernel.rb

@@ -4,7 +4,7 @@
 # Copyright, 2021-2022, by Samuel Williams.
 
 require 'async/scheduler'
-
+require 'sus/fixtures/async'
 require 'timer_quantum'
 
 describe Async::Scheduler do

test/async/scheduler/thread.rb

@@ -4,6 +4,7 @@
 # Copyright, 2021-2022, by Samuel Williams.
 
 require 'async/scheduler'
+require 'sus/fixtures/async'
 
 describe Async::Scheduler do
 	include Sus::Fixtures::Async::ReactorContext

test/async/scheduler/timeout.rb

@@ -4,7 +4,7 @@
 # Copyright, 2022, by Samuel Williams.
 
 require 'async/scheduler'
-
+require 'sus/fixtures/async'
 require 'timeout'
 
 describe Async::Scheduler do