From 8b1917c49f9eff591e10a146787dbdbfd2fc2cc7 Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Sun, 29 Dec 2024 02:03:54 -0800
Subject: [PATCH] Write test to validate generated PoW.

---
 test/calculate-pow.test.mjs | 46 +++++++++++++++++++++++++++++++++++++
 test/main.mjs               |  1 +
 2 files changed, 47 insertions(+)
 create mode 100644 test/calculate-pow.test.mjs

diff --git a/test/calculate-pow.test.mjs b/test/calculate-pow.test.mjs
new file mode 100644
index 0000000..41a89c2
--- /dev/null
+++ b/test/calculate-pow.test.mjs
@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2024 Chris Duncan <chris@zoso.dev>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+'use strict'
+
+import { assert, suite, test } from '#GLOBALS.mjs'
+import { NANO_TEST_VECTORS } from '#test/TEST_VECTORS.js'
+import { SendBlock, Blake2b } from '#dist/main.js'
+
+await suite('Calculate proof-of-work', async () => {
+
+	await test('SendBlock PoW', async () => {
+		const block = new SendBlock(
+			NANO_TEST_VECTORS.SEND_BLOCK.account,
+			NANO_TEST_VECTORS.SEND_BLOCK.balance,
+			NANO_TEST_VECTORS.SEND_BLOCK.link,
+			'0',
+			NANO_TEST_VECTORS.SEND_BLOCK.representative,
+			NANO_TEST_VECTORS.SEND_BLOCK.previous
+		)
+		await block.pow()
+		console.log(block.work)
+		assert.equals(block.previous.length, 64)
+		assert.equals(block.work?.length, 16)
+
+		const work = block.work
+			?.match(/.{2}/g)
+			?.map(hex => parseInt(hex, 16))
+			.reverse()
+		if (work == null) throw new Error('Work invalid')
+		const previous = block.previous
+			?.match(/.{2}/g)
+			?.map(hex => parseInt(hex, 16))
+		if (previous == null) throw new Error('Previous block hash invalid')
+
+		const bytes = new Uint8Array([...work, ...previous])
+		assert.equals(bytes.byteLength, 40)
+
+		const hash = new Blake2b(8)
+			.update(bytes)
+			.digest('hex')
+			.slice(8, 16)
+		assert.ok(parseInt(hash.slice(0, 2), 16) > 0xf0)
+		assert.equals(parseInt(hash.slice(2, 8), 16), 0xffffff)
+	})
+})
diff --git a/test/main.mjs b/test/main.mjs
index 4a78267..1737521 100644
--- a/test/main.mjs
+++ b/test/main.mjs
@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2024 Chris Duncan <chris@zoso.dev>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+import './calculate-pow.test.mjs'
 import './create-wallet.test.mjs'
 import './derive-accounts.test.mjs'
 import './import-wallet.test.mjs'
-- 
2.34.1