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diff --git a/test/lilv_test_uri_map.h b/test/lilv_test_uri_map.h
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+/*
+  Copyright 2007-2020 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef LILV_TEST_URI_MAP_H
+#define LILV_TEST_URI_MAP_H
+
+#include "lilv_test_utils.h"
+
+#include "../src/lilv_internal.h"
+
+#include "serd/serd.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct
+{
+	char** uris;
+	size_t n_uris;
+} LilvTestUriMap;
+
+static inline void
+lilv_test_uri_map_init(LilvTestUriMap* const map)
+{
+	map->uris   = NULL;
+	map->n_uris = 0;
+}
+
+static inline void
+lilv_test_uri_map_clear(LilvTestUriMap* const map)
+{
+	for (size_t i = 0; i < map->n_uris; ++i) {
+		free(map->uris[i]);
+	}
+
+	free(map->uris);
+	map->uris   = NULL;
+	map->n_uris = 0;
+}
+
+static inline LV2_URID
+map_uri(LV2_URID_Map_Handle handle, const char* uri)
+{
+	LilvTestUriMap* map = (LilvTestUriMap*)handle;
+
+	for (size_t i = 0; i < map->n_uris; ++i) {
+		if (!strcmp(map->uris[i], uri)) {
+			return i + 1;
+		}
+	}
+
+	assert(serd_uri_string_has_scheme((const uint8_t*)uri));
+
+	map->uris = (char**)realloc(map->uris, ++map->n_uris * sizeof(char*));
+	map->uris[map->n_uris - 1] = lilv_strdup(uri);
+	return map->n_uris;
+}
+
+static inline const char*
+unmap_uri(LV2_URID_Map_Handle handle, LV2_URID urid)
+{
+	LilvTestUriMap* map = (LilvTestUriMap*)handle;
+
+	if (urid > 0 && urid <= map->n_uris) {
+		return map->uris[urid - 1];
+	}
+
+	return NULL;
+}
+
+#endif // LILV_TEST_URI_MAP_H