test/test_backend.rb in polyphony-0.94 vs test/test_backend.rb in polyphony-0.95

@@ -142,11 +142,15 @@
       buf << :ready
       @backend.read_loop(i, 8192) { |d| buf << d }
       buf << :done
     end
 
-    # writing always causes snoozing
+    # Caution: we want to read in two chunks, that a race condition lurks here:
+    # writing always causes snoozing, but that might not be enough for the
+    # reader fiber to perform the read before the second write, so for the test
+    # to work consistently we add a little sleep between the two writes.
     o << 'foo'
+    sleep 0.03
     o << 'bar'
     o.close
 
     f.await
     assert_equal [:ready, 'foo', 'bar', :done], buf