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diff --git a/gfx/harfbuzz/src/test-set.cc b/gfx/harfbuzz/src/test-set.cc
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+++ b/gfx/harfbuzz/src/test-set.cc
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+/*
+ * Copyright © 2021  Behdad Esfahbod
+ *
+ *  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.
+ */
+
+#include "hb.hh"
+#include "hb-set.hh"
+
+int
+main (int argc, char **argv)
+{
+
+  /* Test copy constructor. */
+  {
+    hb_set_t v1 {1, 2};
+    hb_set_t v2 {v1};
+    assert (v1.get_population () == 2);
+    assert (hb_len (hb_iter (v1)) == 2);
+    assert (v2.get_population () == 2);
+  }
+
+  /* Test copy assignment. */
+  {
+    hb_set_t v1 {1, 2};
+    hb_set_t v2;
+    v2 = v1;
+    assert (v1.get_population () == 2);
+    assert (v2.get_population () == 2);
+  }
+
+  /* Test move constructor. */
+  {
+    hb_set_t s {1, 2};
+    hb_set_t v (std::move (s));
+    assert (s.get_population () == 0);
+    assert (hb_len (hb_iter (s)) == 0);
+    assert (v.get_population () == 2);
+  }
+
+  /* Test move assignment. */
+  {
+    hb_set_t s = hb_set_t {1, 2};
+    hb_set_t v;
+    v = std::move (s);
+    assert (s.get_population () == 0);
+    assert (v.get_population () == 2);
+  }
+
+  /* Test initializing from iterable. */
+  {
+    hb_set_t s;
+
+    s.add (18);
+    s.add (12);
+
+    hb_vector_t<hb_codepoint_t> v (s);
+    hb_set_t v0 (v);
+    hb_set_t v1 (s);
+    hb_set_t v2 (std::move (s));
+
+    assert (s.get_population () == 0);
+    assert (v0.get_population () == 2);
+    assert (v1.get_population () == 2);
+    assert (v2.get_population () == 2);
+  }
+
+  /* Test initializing from iterator. */
+  {
+    hb_set_t s;
+
+    s.add (18);
+    s << 12;
+
+    /* Sink a range. */
+    s << hb_pair_t<hb_codepoint_t, hb_codepoint_t> {1, 3};
+
+    hb_set_t v (hb_iter (s));
+
+    assert (v.get_population () == 5);
+  }
+
+  /* Test initializing from initializer list and swapping. */
+  {
+    hb_set_t v1 {1, 2, 3};
+    hb_set_t v2 {4, 5};
+    hb_swap (v1, v2);
+    assert (v1.get_population () == 2);
+    assert (v2.get_population () == 3);
+  }
+
+  return 0;
+}