From 84623ffaf9673310405ba48d3b4b36890a0abc29 Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <me@tobin.cc>
Date: Thu, 20 Feb 2025 13:38:22 +1100
Subject: [PATCH] Add hash_again regression test

Add a simple regression test prior to patching the
`sha256::Hash::hash_again` function.
---
 hashes/tests/regression.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hashes/tests/regression.rs b/hashes/tests/regression.rs
index 319d6ecf3..2bacd7ff2 100644
--- a/hashes/tests/regression.rs
+++ b/hashes/tests/regression.rs
@@ -87,3 +87,13 @@ fn regression_siphash24_with_key() {
     let want = "e823ed82311d601a";
     assert_eq!(got, want);
 }
+
+#[test]
+fn regression_sha256_hash_again() {
+    let hash = sha256::Hash::hash(b"Don't explain your philosophy. Embody it.");
+    let again = hash.hash_again();
+
+    let got = format!("{}", again);
+    let want = "28273103bcd88ab99e2b1007174770ff3f0ea91ee4b3ac942879ed1a2d264b4c";
+    assert_eq!(got, want);
+}