diff --git a/src/globals/ext-tests/brotli.php b/src/globals/ext-tests/brotli.php
new file mode 100644
index 00000000..7c8e94d2
--- /dev/null
+++ b/src/globals/ext-tests/brotli.php
@@ -0,0 +1,8 @@
+<?php
+
+declare(strict_types=1);
+
+$str = 'brotli_compress ( string $data, int $level = BROTLI_COMPRESS_LEVEL_DEFAULT, int $mode = BROTLI_GENERIC, string|null $dict = null ): string|false';
+assert(function_exists('brotli_compress'));
+assert(function_exists('brotli_uncompress '));
+assert(brotli_uncompress(brotli_compress($str)) === $str);
diff --git a/src/globals/ext-tests/xz.php b/src/globals/ext-tests/xz.php
new file mode 100644
index 00000000..97ebde32
--- /dev/null
+++ b/src/globals/ext-tests/xz.php
@@ -0,0 +1,8 @@
+<?php
+
+declare(strict_types=1);
+
+$str = 'Data you would like compressed.';
+assert(function_exists('xzencode'));
+assert(function_exists('xzdecode'));
+assert(xzdecode(xzencode($str)) === $str);