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diff --git a/tests/nghttp2_assertion.h b/tests/nghttp2_assertion.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2024 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_ASSERTION_H
+#define NGHTTP2_ASSERTION_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include "munit.h"
+
+#include "nghttp2_frame.h"
+
+#define assert_nv_equal(A, B, len, mem)                                        \
+  do {                                                                         \
+    size_t alloclen = sizeof(nghttp2_nv) * (len);                              \
+    const nghttp2_nv *sa = (A), *sb = (B);                                     \
+    nghttp2_nv *a = (mem)->malloc(alloclen, NULL);                             \
+    nghttp2_nv *b = (mem)->malloc(alloclen, NULL);                             \
+    size_t i_;                                                                 \
+    memcpy(a, sa, alloclen);                                                   \
+    memcpy(b, sb, alloclen);                                                   \
+    nghttp2_nv_array_sort(a, (len));                                           \
+    nghttp2_nv_array_sort(b, (len));                                           \
+    for (i_ = 0; i_ < (size_t)(len); ++i_) {                                   \
+      assert_memn_equal(a[i_].name, a[i_].namelen, b[i_].name, b[i_].namelen); \
+      assert_memn_equal(a[i_].value, a[i_].valuelen, b[i_].value,              \
+                        b[i_].valuelen);                                       \
+    }                                                                          \
+    (mem)->free(b, NULL);                                                      \
+    (mem)->free(a, NULL);                                                      \
+  } while (0);
+
+#endif /* NGHTTP2_ASSERTION_H */