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diff --git a/src/3rdparty/harfbuzz-ng/src/test-algs.cc b/src/3rdparty/harfbuzz-ng/src/test-algs.cc
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+++ b/src/3rdparty/harfbuzz-ng/src/test-algs.cc
@@ -0,0 +1,95 @@
+/*
+ * Copyright © 2019  Facebook, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Facebook Author(s): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+#include "hb-algs.hh"
+
+
+static char *
+test_func (int a, char **b)
+{
+  return b ? b[a] : nullptr;
+}
+
+struct A
+{
+  void a () {}
+};
+
+int
+main (int argc, char **argv)
+{
+  int i = 1;
+  auto p = hb_pair (1, i);
+
+  p.second = 2;
+  assert (i == 2);
+
+  const int c = 3;
+  auto pc = hb_pair (1, c);
+  assert (pc.second == 3);
+
+  auto q = p;
+  assert (&q != &p);
+  q.second = 4;
+  assert (i == 4);
+
+  hb_invoke (test_func, 0, nullptr);
+
+  A a;
+  hb_invoke (&A::a, a);
+
+  assert (1 == hb_min (8, 1));
+  assert (8 == hb_max (8, 1));
+
+  int x = 1, y = 2;
+  hb_min (x, 3);
+  hb_min (3, x);
+  hb_min (x, 4 + 3);
+  int &z = hb_min (x, y);
+  z = 3;
+  assert (x == 3);
+
+  hb_pair_t<const int*, int> xp = hb_pair_t<int *, long> (nullptr, 0);
+  xp = hb_pair_t<int *, double> (nullptr, 1);
+  xp = hb_pair_t<const int*, int> (nullptr, 1);
+
+  assert (3 == hb_partial (hb_min, 3) (4));
+  assert (3 == hb_partial<1> (hb_min, 4) (3));
+
+  auto M0 = hb_partial<2> (hb_max, 0);
+  assert (M0 (-2) == 0);
+  assert (M0 (+2) == 2);
+
+  assert (hb_add (2) (5) == 7);
+  assert (hb_add (5) (2) == 7);
+
+  x = 1;
+  assert (++hb_inc (x) == 3);
+  assert (x == 3);
+
+  return 0;
+}