From 4147f3e1ad1cf1b7d41699e03c567e2b373fbd14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Skytt=C3=A4?= <ville.skytta@upcloud.com>
Date: Sun, 10 Sep 2023 21:39:27 +0300
Subject: [PATCH] Add local vs UTC `Timestamp(Time)` benchmark

Co-authored-by: Peter Bourgon <peterbourgon@users.noreply.github.com>
---
 ulid_test.go | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/ulid_test.go b/ulid_test.go
index 43f81c6..e87568a 100644
--- a/ulid_test.go
+++ b/ulid_test.go
@@ -834,10 +834,21 @@ func BenchmarkNow(b *testing.B) {
 
 func BenchmarkTimestamp(b *testing.B) {
 	now := time.Now()
-	b.SetBytes(8)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		_ = ulid.Timestamp(now)
+	for _, tc := range []struct {
+		name   string
+		tsfunc func() time.Time
+	}{
+		{"WithLocal", func() time.Time { return now }},
+		{"WithUTC", func() time.Time { return now.UTC() }}, //nolint:gocritic // keep lambda for fair comparison
+	} {
+		tc := tc
+		b.Run(tc.name, func(b *testing.B) {
+			b.SetBytes(8)
+			b.ResetTimer()
+			for i := 0; i < b.N; i++ {
+				_ = ulid.Timestamp(tc.tsfunc())
+			}
+		})
 	}
 }