feat add BigNumber tests

lib/BigNumber.js

@@ -1,66 +0,0 @@
-'use strict';
-
-const { jsbn: { BigInteger } } = require('node-forge');
-
-class BigNumber {
-	constructor(value, radix = 10) {
-		if (value === null || value === undefined)
-			throw new Error('value is missing.');
-
-		this._n = new BigInteger(null);
-
-		if (value instanceof BigNumber)
-			this._n = value._n;
-		else if (value instanceof BigInteger)
-			this._n = value;
-		else if (typeof value === 'number')
-			this._n.fromInt(value);
-		else if (typeof value === 'string')
-			this._n.fromString(value, radix);
-		else if (Buffer.isBuffer(value))
-			this._n.fromString(value.toString('hex'), 16);
-		else if (Array.isArray(value))
-			this._n.fromString(Buffer.from(value).toString('hex'), 16);
-		else
-			throw new TypeError('Unsupported value type.');
-	}
-
-	toBEBuffer(length = undefined) {
-		const arr = this._n.toByteArray();
-		if (length && arr.length > length)
-			throw new Error('Number out of range.');
-		while (arr.length < length)
-			arr.unshift(0);
-		return Buffer.from(arr);
-	}
-
-	toBuffer() {
-		return Buffer.from(this._n.toByteArray());
-	}
-
-	toString(radix = 10) {
-		return this._n.toString(radix);
-	}
-
-	and(num) {
-		return new BigNumber(this._n.and(new BigNumber(num)._n));
-	}
-
-	mul(num) {
-		return new BigNumber(this._n.multiply(new BigNumber(num)._n));
-	}
-
-	mod(num) {
-		return new BigNumber(this._n.mod(new BigNumber(num)._n));
-	}
-
-	shrn(num) {
-		return new BigNumber(this._n.shiftRight(new BigNumber(num)._n));
-	}
-
-	static fromBuffer(buf) {
-		return new BigNumber(buf.toString('hex'), 16);
-	}
-}
-
-module.exports = BigNumber;