From 74ef53ae3d3c4576e47851795599bc2b73ec35d0 Mon Sep 17 00:00:00 2001
From: Capri <caprimc@yahoo.com>
Date: Thu, 17 Sep 2026 17:15:27 +0000
Subject: [PATCH] Test multi-algo chainwork continuity

---
 src/test/pow_tests.cpp | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/test/pow_tests.cpp b/src/test/pow_tests.cpp
index d45598c..8df86d8 100644
--- a/src/test/pow_tests.cpp
+++ b/src/test/pow_tests.cpp
@@ -149,6 +149,32 @@ BOOST_AUTO_TEST_CASE(MultiAlgo_chainwork_normalization_test)
         GetBlockProof(shaChild, consensus) ==
         GetBlockProof(randomXChild, consensus));
 
+    // A fixed branch-independent rational scale can preserve chainwork
+    // continuity across the activation boundary. Derive an exact scale for
+    // this synthetic test state only; production parameters are configured
+    // separately in chainparams.
+    const arith_uint256 preActivationWork =
+        GetBlockProof(blocks[39], consensus);
+    const arith_uint256 unscaledPostActivationWork =
+        GetBlockProof(shaChild, consensus);
+
+    BOOST_REQUIRE(preActivationWork > 0);
+    BOOST_REQUIRE(unscaledPostActivationWork > 0);
+    BOOST_REQUIRE_LE(preActivationWork.bits(), 32U);
+    BOOST_REQUIRE_LE(unscaledPostActivationWork.bits(), 32U);
+
+    consensus.multiAlgoChainworkScaleNumerator =
+        static_cast<uint32_t>(preActivationWork.GetLow64());
+    consensus.multiAlgoChainworkScaleDenominator =
+        static_cast<uint32_t>(unscaledPostActivationWork.GetLow64());
+
+    BOOST_CHECK(
+        GetBlockProof(shaChild, consensus) ==
+        preActivationWork);
+    BOOST_CHECK(
+        GetBlockProof(randomXChild, consensus) ==
+        preActivationWork);
+
 }