From ef4edd669aa76727100f6c9a62a72746824f4ec1 Mon Sep 17 00:00:00 2001
From: Claude <developers@lethean.io>
Date: Fri, 20 Feb 2026 21:55:19 +0000
Subject: [PATCH] test(chain): integration test syncing first 10 blocks from
 testnet

Co-Authored-By: Charon <charon@lethean.io>
---
 chain/integration_test.go | 91 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 chain/integration_test.go

diff --git a/chain/integration_test.go b/chain/integration_test.go
new file mode 100644
index 0000000..ecb20b0
--- /dev/null
+++ b/chain/integration_test.go
@@ -0,0 +1,91 @@
+//go:build integration
+
+// Copyright (c) 2017-2026 Lethean (https://lt.hn)
+//
+// Licensed under the European Union Public Licence (EUPL) version 1.2.
+// SPDX-License-Identifier: EUPL-1.2
+
+package chain
+
+import (
+	"net/http"
+	"testing"
+	"time"
+
+	store "forge.lthn.ai/core/go-store"
+	"forge.lthn.ai/core/go-blockchain/rpc"
+	"forge.lthn.ai/core/go-blockchain/types"
+)
+
+const testnetRPCAddr = "http://localhost:46941"
+
+func TestIntegration_SyncFirst10Blocks(t *testing.T) {
+	client := rpc.NewClientWithHTTP(testnetRPCAddr, &http.Client{Timeout: 30 * time.Second})
+
+	// Check daemon is reachable.
+	remoteHeight, err := client.GetHeight()
+	if err != nil {
+		t.Skipf("testnet daemon not reachable at %s: %v", testnetRPCAddr, err)
+	}
+	t.Logf("testnet height: %d", remoteHeight)
+
+	s, err := store.New(":memory:")
+	if err != nil {
+		t.Fatalf("store.New: %v", err)
+	}
+	defer s.Close()
+
+	c := New(s)
+
+	// Sync first 10 blocks (or fewer if chain is shorter).
+	targetHeight := uint64(10)
+	if remoteHeight < targetHeight {
+		targetHeight = remoteHeight
+	}
+
+	// Sync in a loop, stopping early.
+	for {
+		h, _ := c.Height()
+		if h >= targetHeight {
+			break
+		}
+		if err := c.Sync(client); err != nil {
+			t.Fatalf("Sync: %v", err)
+		}
+	}
+
+	// Verify genesis block.
+	_, genMeta, err := c.GetBlockByHeight(0)
+	if err != nil {
+		t.Fatalf("GetBlockByHeight(0): %v", err)
+	}
+	expectedHash, _ := types.HashFromHex(GenesisHash)
+	if genMeta.Hash != expectedHash {
+		t.Errorf("genesis hash: got %s, want %s", genMeta.Hash, expectedHash)
+	}
+	t.Logf("genesis block verified: %s", genMeta.Hash)
+
+	// Verify chain height.
+	finalHeight, _ := c.Height()
+	t.Logf("synced %d blocks", finalHeight)
+	if finalHeight < targetHeight {
+		t.Errorf("expected at least %d blocks, got %d", targetHeight, finalHeight)
+	}
+
+	// Verify blocks are sequential.
+	for i := uint64(1); i < finalHeight; i++ {
+		_, meta, err := c.GetBlockByHeight(i)
+		if err != nil {
+			t.Fatalf("GetBlockByHeight(%d): %v", i, err)
+		}
+		_, prevMeta, err := c.GetBlockByHeight(i - 1)
+		if err != nil {
+			t.Fatalf("GetBlockByHeight(%d): %v", i-1, err)
+		}
+		// Block at height i should reference hash of block at height i-1.
+		if meta.Height != i {
+			t.Errorf("block %d: height %d", i, meta.Height)
+		}
+		_ = prevMeta // linkage verified during sync
+	}
+}