Test events

src/index.js

@@ -16,6 +16,7 @@ const addressFormats = {
 class Vain extends Emitter {
 	constructor({keyFormat = 'wif', addressFormat = 'p2pkh', prefix}) {
 		super();
+		this.generating = false;
 		this.generateKey = keyFormats[keyFormat];
 		this.addressFormat = addressFormats[addressFormat];
 
@@ -33,6 +34,7 @@ class Vain extends Emitter {
 	}
 
 	generate() {
+		this.generating = true;
 		const startTime = Date.now();
 
 		const {generateKey, addressFormat} = this;
@@ -44,6 +46,10 @@ class Vain extends Emitter {
 		let lastUpdate = Date.now();
 
 		while (!found) {
+			if (!this.generating) {
+				return {stopped: true};
+			}
+
 			attempts++;
 
 			keyData = generateKey({addressFormat});
@@ -51,6 +57,7 @@ class Vain extends Emitter {
 
 			if (address.startsWith(this.prefix)) {
 				found = true;
+				this.generating = false;
 			}
 
 			const now = Date.now();

test/events.js

@@ -0,0 +1,38 @@
+import test from 'ava';
+import * as bitcoin from 'bitcoinjs-lib';
+import Vain from '..';
+
+test('Vain instance emits `found` event when vanity address is found', t => {
+	t.plan(2);
+
+	const options = {
+		prefix: 'A'
+	};
+	const vain = new Vain(options);
+
+	vain.on('found', ({address, wif}) => {
+		const keyPair = bitcoin.ECPair.fromWIF(wif);
+		const {address: wifAddress} = bitcoin.payments.p2pkh({pubkey: keyPair.publicKey});
+
+		t.true(address.startsWith(`1${options.prefix}`));
+		t.is(address, wifAddress);
+	});
+
+	vain.generate();
+});
+
+test('Vain instance emits `update` event during address generation', t => {
+	t.plan(1);
+
+	const options = {
+		prefix: '1BitcoinEaterAddressDontSend'
+	};
+	const vain = new Vain(options);
+
+	vain.on('update', () => {
+		vain.generating = false;
+		t.pass();
+	});
+
+	vain.generate();
+});