Add spec to prevent zombie status

spec/integration/bisect_spec.rb

@@ -33,14 +33,19 @@ def bisect(cli_args, expected_status=nil)
       end
     end
 
-    context "when the bisect commasaturingnd is long" do
+    context "when the bisect command saturates the pipe" do
       # On OSX and Linux a file descriptor limit meant that the bisect process got stuck at a certain limit.
       # This test demonstrates that we can run large bisects above this limit (found to be at time of commit).
       # See: https://github.com/rspec/rspec-core/pull/2669
       it 'does not hit pipe size limit and does not get stuck' do
         output = bisect(%W[spec/rspec/core/resources/blocking_pipe_bisect_spec.rb_], 1)
         expect(output).to include("No failures found.")
       end
+
+      it 'does not leave zombie processes', :unless => RSpec::Support::OS.windows? do
+        bisect(%W[spec/rspec/core/resources/blocking_pipe_bisect_spec.rb_], 1)
+        expect(%x[ps -ho pid,state]).to_not include("Z")
+      end
     end
   end
 end