test/test_wbuf.rb in yahns-1.10.0 vs test/test_wbuf.rb in yahns-1.11.0

@@ -69,11 +69,20 @@
       rescue Errno::EAGAIN
         break
       end while true
     end
     wbuf = Yahns::Wbuf.new([], true, Dir.tmpdir, :wait_writable)
-    assert_equal :wait_writable, wbuf.wbuf_write(a, buf)
-    assert_equal :wait_writable, wbuf.wbuf_flush(a)
+
+    rv1 = wbuf.wbuf_write(a, buf)
+    rv2 = wbuf.wbuf_flush(a)
+    case rv1
+    when nil
+      assert_equal true, rv2, 'some kernels succeed with real sendfile'
+    when :wait_writable
+      assert_equal :wait_writable, rv2, 'some block on sendfile'
+    else
+      flunk "unexpected from wbuf_write/flush: #{rv1.inspect} / #{rv2.inspect}"
+    end
 
     # drain the buffer
     Timeout.timeout(10) { b.read(b.nread) until b.nread == 0 }
 
     # b.nread will increase after this