tests: add HDNode fromSeed throwing tests

src/hdnode.js

@@ -124,6 +124,10 @@ HDNode.fromBase58 = function (string, networks) {
   return hd
 }
 
+HDNode.prototype.getAddress = function () {
+  return this.keyPair.getAddress()
+}
+
 HDNode.prototype.getIdentifier = function () {
   return bcrypto.hash160(this.keyPair.getPublicKeyBuffer())
 }
@@ -132,10 +136,6 @@ HDNode.prototype.getFingerprint = function () {
   return this.getIdentifier().slice(0, 4)
 }
 
-HDNode.prototype.getAddress = function () {
-  return this.keyPair.getAddress()
-}
-
 HDNode.prototype.neutered = function () {
   var neuteredKeyPair = new ECPair(null, this.keyPair.Q, {
     network: this.keyPair.network

test/hdnode.js

@@ -2,6 +2,7 @@
 /* eslint-disable no-new */
 
 var assert = require('assert')
+var ecdsa = require('../src/ecdsa')
 var sinon = require('sinon')
 
 var BigInteger = require('bigi')
@@ -9,6 +10,7 @@ var ECPair = require('../src/ecpair')
 var HDNode = require('../src/hdnode')
 
 var fixtures = require('./fixtures/hdnode.json')
+var curve = ecdsa.__curve
 
 var NETWORKS = require('../src/networks')
 var NETWORKS_LIST = [] // Object.values(NETWORKS)
@@ -68,6 +70,24 @@ describe('HDNode', function () {
       })
     })
 
+    it('throws if IL is not within interval [1, n - 1] | IL === 0', sinon.test(function () {
+      this.mock(BigInteger).expects('fromBuffer')
+        .once().returns(BigInteger.ZERO)
+
+      assert.throws(function () {
+        HDNode.fromSeedHex('ffffffffffffffffffffffffffffffff')
+      }, /Private key must be greater than 0/)
+    }))
+
+    it('throws if IL is not within interval [1, n - 1] | IL === n', sinon.test(function () {
+      this.mock(BigInteger).expects('fromBuffer')
+        .once().returns(curve.n)
+
+      assert.throws(function () {
+        HDNode.fromSeedHex('ffffffffffffffffffffffffffffffff')
+      }, /Private key must be less than the curve order/)
+    }))
+
     it('throws on low entropy seed', function () {
       assert.throws(function () {
         HDNode.fromSeedHex('ffffffffff')