diff --git a/test/common.js b/test/common.js
index e2f88f8ad..6556901b9 100644
--- a/test/common.js
+++ b/test/common.js
@@ -3,6 +3,16 @@ var cryptoLib = require('crypto-browserify');
 var should = require('should');
 var sinon = require('sinon');
 
+should.use(function (should, Assertion) {
+	Assertion.add('hexString', function () {
+		this.params = {
+			operator: 'to be hex string',
+		};
+		(Buffer.from(this.obj, 'hex').toString('hex'))
+			.should.equal(this.obj);
+	});
+});
+
 // See https://github.com/shouldjs/should.js/issues/41
 Object.defineProperty(global, 'should', { value: should });
 global.sinon = sinon;
diff --git a/test/transactions/crypto.js b/test/transactions/crypto.js
index 1e2443e55..eadee87ac 100644
--- a/test/transactions/crypto.js
+++ b/test/transactions/crypto.js
@@ -214,14 +214,8 @@ describe('crypto.js', function () {
 
 			(keys).should.be.ok();
 			(keys).should.be.type('object');
-			(keys).should.have.property('publicKey').and.be.type('string');
-			(keys).should.have.property('privateKey').and.be.type('string');
-			should.doesNotThrow(function () {
-				Buffer.from(keys.publicKey, 'hex');
-			});
-			should.doesNotThrow(function () {
-				Buffer.from(keys.privateKey, 'hex');
-			});
+			(keys).should.have.property('publicKey').and.be.type('string').and.be.hexString();
+			(keys).should.have.property('privateKey').and.be.type('string').and.be.hexString();
 		});
 	});
 
diff --git a/test/transactions/dapp.js b/test/transactions/dapp.js
index 8fd07ed8f..955eaa5f7 100644
--- a/test/transactions/dapp.js
+++ b/test/transactions/dapp.js
@@ -109,10 +109,7 @@ describe('dapp.js', function () {
 			});
 
 			it('should have senderPublicKey as hex string', function () {
-				(trs).should.have.property('senderPublicKey').and.be.type('string');
-				return should.doesNotThrow(function () {
-					Buffer.from(trs.senderPublicKey, 'hex');
-				});
+				(trs).should.have.property('senderPublicKey').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have timestamp as number', function () {
@@ -159,17 +156,11 @@ describe('dapp.js', function () {
 			});
 
 			it('should have signature as hex string', function () {
-				(trs).should.have.property('signature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signature, 'hex');
-				});
+				(trs).should.have.property('signature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have second signature in hex', function () {
-				(trs).should.have.property('signSignature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signSignature, 'hex');
-				});
+				(trs).should.have.property('signSignature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should be signed correctly', function () {
diff --git a/test/transactions/delegate.js b/test/transactions/delegate.js
index e45e2906c..737655683 100644
--- a/test/transactions/delegate.js
+++ b/test/transactions/delegate.js
@@ -102,24 +102,15 @@ describe('delegate.js', function () {
 			});
 
 			it('should have senderPublicKey in hex', function () {
-				(trs).should.have.property('senderPublicKey').and.type('string').and.equal(keys.publicKey);
-				should.doesNotThrow(function () {
-					Buffer.from(trs.senderPublicKey, 'hex');
-				});
+				(trs).should.have.property('senderPublicKey').and.type('string').and.equal(keys.publicKey).and.be.hexString();
 			});
 
 			it('should have signature in hex', function () {
-				(trs).should.have.property('signature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signature, 'hex');
-				});
+				(trs).should.have.property('signature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have second signature in hex', function () {
-				(trs).should.have.property('signSignature').and.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signSignature, 'hex');
-				});
+				(trs).should.have.property('signSignature').and.type('string').and.be.hexString();
 			});
 
 			it('should have delegate asset', function () {
diff --git a/test/transactions/signature.js b/test/transactions/signature.js
index 8d17c9489..626e74280 100644
--- a/test/transactions/signature.js
+++ b/test/transactions/signature.js
@@ -99,10 +99,7 @@ describe('signature.js', function () {
 				});
 
 				it('should have publicKey in hex', function () {
-					(sgn.asset.signature).should.have.property('publicKey').and.be.type('string');
-					should.doesNotThrow(function () {
-						Buffer.from(sgn.asset.signature.publicKey, 'hex');
-					});
+					(sgn.asset.signature).should.have.property('publicKey').and.be.type('string').and.be.hexString();
 				});
 
 				it('should have publicKey in 32 bytes', function () {
diff --git a/test/transactions/transaction.js b/test/transactions/transaction.js
index 9bef58297..47ef1854a 100644
--- a/test/transactions/transaction.js
+++ b/test/transactions/transaction.js
@@ -81,10 +81,7 @@ describe('transaction.js', function () {
 			});
 
 			it('should have senderPublicKey as hex string', function () {
-				(trs).should.have.property('senderPublicKey').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.senderPublicKey, 'hex');
-				});
+				(trs).should.have.property('senderPublicKey').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have recipientId as string and to be equal 58191285901858109L', function () {
@@ -104,10 +101,7 @@ describe('transaction.js', function () {
 			});
 
 			it('should have signature as hex string', function () {
-				(trs).should.have.property('signature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signature, 'hex');
-				});
+				(trs).should.have.property('signature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should be signed correctly', function () {
@@ -160,10 +154,7 @@ describe('transaction.js', function () {
 			});
 
 			it('should have senderPublicKey as hex string', function () {
-				(trs).should.have.property('senderPublicKey').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.senderPublicKey, 'hex');
-				});
+				(trs).should.have.property('senderPublicKey').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have recipientId as string and to be equal 58191285901858109L', function () {
@@ -183,17 +174,11 @@ describe('transaction.js', function () {
 			});
 
 			it('should have signature as hex string', function () {
-				(trs).should.have.property('signature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signature, 'hex');
-				});
+				(trs).should.have.property('signature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have signSignature as hex string', function () {
-				(trs).should.have.property('signSignature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(trs.signSignature, 'hex');
-				});
+				(trs).should.have.property('signSignature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should be signed correctly', function () {
diff --git a/test/transactions/vote.js b/test/transactions/vote.js
index c6df39df9..f3498a395 100644
--- a/test/transactions/vote.js
+++ b/test/transactions/vote.js
@@ -101,24 +101,15 @@ describe('vote.js', function () {
 			});
 
 			it('should have senderPublicKey hex string equal to sender public key', function () {
-				(vt).should.have.property('senderPublicKey').and.be.type('string').and.equal(publicKey);
-				should.doesNotThrow(function () {
-					Buffer.from(vt.senderPublicKey, 'hex');
-				});
+				(vt).should.have.property('senderPublicKey').and.be.type('string').and.equal(publicKey).and.be.hexString();
 			});
 
 			it('should have signature hex string', function () {
-				(vt).should.have.property('signature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(vt.signature, 'hex');
-				});
+				(vt).should.have.property('signature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should have second signature hex string', function () {
-				(vt).should.have.property('signSignature').and.be.type('string');
-				should.doesNotThrow(function () {
-					Buffer.from(vt.signSignature, 'hex');
-				});
+				(vt).should.have.property('signSignature').and.be.type('string').and.be.hexString();
 			});
 
 			it('should be signed correctly', function () {
@@ -167,10 +158,8 @@ describe('vote.js', function () {
 
 				it('should have public keys in hex', function () {
 					vt.asset.votes.forEach(function (v) {
-						(v).should.be.type('string').startWith('+');
-						should.doesNotThrow(function () {
-							Buffer.from(v.substring(1, v.length), 'hex');
-						});
+						(v).should.be.type('string').and.startWith('+');
+						(v.slice(1)).should.be.hexString();
 					});
 				});