issue guard#533: subject.stop so thread cannot keep running and lead …

…to raise_expired_test_double_error

spec/lib/listen/adapter/linux_spec.rb

@@ -26,6 +26,10 @@
     # TODO: fix other adapters too!
     subject { described_class.new(config) }
 
+    after do
+      subject.stop
+    end
+
     describe 'watch events' do
       let(:directories) { [Pathname.pwd] }
       let(:adapter_options) { {} }
@@ -40,6 +44,11 @@
         allow(config).to receive(:adapter_options).and_return(adapter_options)
         allow(config).to receive(:queue).and_return(queue)
         allow(config).to receive(:silencer).and_return(silencer)
+        allow(fake_worker).to receive(:close)
+      end
+
+      after do
+        subject.stop
       end
 
       it 'starts by calling watch with default events' do
@@ -168,7 +177,6 @@
         end
 
         it 'stops the worker' do
-          expect(fake_worker).to receive(:close)
           subject.stop
         end
       end