From 900174737fe9d099ffa6bd78c95ba4e8abad2c31 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Wed, 21 Jun 2023 17:21:30 +0100
Subject: string.byte_size

---
 test/gleam/string_test.gleam | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'test')

diff --git a/test/gleam/string_test.gleam b/test/gleam/string_test.gleam
index 3f958d4..3306f0e 100644
--- a/test/gleam/string_test.gleam
+++ b/test/gleam/string_test.gleam
@@ -985,3 +985,17 @@ if erlang {
   ) -> List(anything) =
     "gleam_stdlib_test_ffi" "improper_list_append"
 }
+
+pub fn byte_size_test() {
+  let assert 0 = string.byte_size("")
+  let assert 1 = string.byte_size("a")
+  let assert 2 = string.byte_size("ab")
+  let assert 3 = string.byte_size("abc")
+
+  // Unicode graphemes. These will be multiple bytes.
+  let assert 1 = string.byte_size("a")
+  let assert 2 = string.byte_size("ä")
+  let assert 4 = string.byte_size("👩")
+  let assert 8 = string.byte_size("👩🏾")
+  let assert 15 = string.byte_size("👩🏾‍🦰")
+}
-- 
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