Everything You Should Know About Blockchain Testing

Everything You Should Know About Blockchain Testing 2021

Everything You Should Know About Blockchain Testing >> In 1991, Stuart Haber and W. Scott Stornetta first outlined the idea of a blockchain. In 2008, Satoshi Nakamoto released a whitepaper that discussed Bitcoin and blockchain in-depth. Now, businesses across a variety of industries use blockchain technology. Blockchain has changed the way people conduct business. 

Table of Contents

What is Blockchain?

Simply put, blockchain is a secure and encrypted database of public records. Though it’s available to the public, blockchain is virtually impossible to tamper with. This ledger is shared and maintained across a peer-to-peer network of real people.

How Blockchain Works

Suppose you need to send $100 from your bank account to your friend’s bank account. A payment processor or a third party will process the transfer if you and your friend use different banks. This is how it works.

First, your bank will identify the details of your friend’s bank. Then, a third-party application or a payment processor will facilitate the transfer. They will send the money over to your friend’s bank after deducting a small fee. Your banks and the intermediary all keep a record of this transaction.

On the other hand, this is how it works in a blockchain:

  1. You initiate and authorize a transaction.
  2. A block is created for the transaction.
  3. The block is sent to participants in the peer-to-peer network.
  4. Participants (nodes) validate your transaction.
  5. Participants are rewarded for validating your transaction.
  6. The blockchain receives the validated block.
  7. An update is sent to the entire network.
  8. The transaction is complete.

It does seem like there are more than a few extra steps here. However, these steps make every blockchain transaction secure.

Every block in a blockchain contains the data of the transaction, a hash, and the hash of the chain before it. Once a block is in the blockchain, it would be nearly impossible to tamper with that block.

Each transaction is encrypted. Every block also has a record of the encrypted block that comes before it. Even if someone managed to hack or tamper with a transaction, the changes made to that block will invalidate every single block that comes after it.

But, you may be thinking, “If blockchain is so secure, then why do we need to test it?”

Why is There a Need For Blockchain Testing?

In early 2019, International Data Corp estimated that blockchain technology research and development spendings would reach $12.4 billion in 2022. By 2020, blockchain spending was estimated to be about $4.1 billion worldwide. Banking, manufacturing, retail, and professional services are the top industries involved in blockchains.

There are currently four types of blockchains. Aside from public blockchains, there are now private blockchains, hybrid blockchains, and sidechains. Not many businesses currently put blockchain technology in core business processes, but the numbers are expected to rise as time passes.

It’s becoming more and more important to perform and maintain proper blockchain testing processes. Blockchain testing isn’t just about security, and it’s not really the blockchain we need to test. Blocks in blockchains are immutable. It wouldn’t make sense to hack a block, because everyone in the network would immediately know.

Yet, this immutability is also a challenge. Everything in the chain is permanent so we need to make sure that every transaction we add into it is right. We need to ensure the quality of the blocks that are being added to the blockchain.

Blockchain Testing Types and Phases

Like any other type of technology, blockchain technology must undergo rigorous testing. Testers need to ensure that every part of a blockchain application is working as it should. But what does blockchain testing look like? What types of tests do blockchain testers perform? 

This is what this section is all about.


Before testing, testers first need to understand functional and business requirements. They need to know how the users will interact with the blockchain application. The initiation phase is also when the testers would decide on which testing approach to use.


Testers will then prepare test cases and test data. The design phase is also when the testers decide on the testing platform that they’d use. Most QA teams use manual and automated testing to test complex blockchain processes. Testers may need to learn automation testing if they don’t already know how to. 

Companies may also outsource blockchain testing to save on testing environment setup costs. Testers also define performance metrics during the design phase.


The testing phase makes use of different types of tests to see how well an application works. 

Here are some common types of tests used in blockchain testing:

  • API testing ensures APIs that have interactions with blockchain are free from errors. API mistakes in blockchain can be very costly.
  • Block testing ensures that every block in the blockchain is working as it should. Testers may need to look at the size of the block, the length of the chain, the accuracy of the data being transmitted, and the accuracy of the process of adding to the chain.
  • Smart contract testing is a form of functional testing. Smart contracts are automatically executed when transactions meet some predefined conditions. Testers also use unit and integration tests to test a smart contract’s behavior.
  • Node testing makes sure required validation processes are in place and that every node cooperates in the validation.
  • Performance testing helps identify performance bottlenecks. These could affect the reliability of the blockchain application.


The final phase of testing is the reporting phase. Here, the testers describe the results of the tests performed. They can give the developers, the project owners, and other stakeholders an update on the project’s status.

Reports can provide developers with an insight into how the application performs. Reports can discuss the speed, reliability, security, and efficiency of the application. Reports may also contain application vulnerabilities.

Some automated test platforms can provide automated test reports and development recommendations. Choosing a test automation framework that works for the application is important.


Blockchain testing ensures that the technology behind the applications is implemented successfully. The blockchain itself has no real need for testing. But, testers still need to test the applications that interface with the chain.

Blockchain technology isn’t just used in cryptocurrency and financial industries. It makes transaction processing more efficient, transparent, traceable, and secure. 

Different industries have now started to adopt this trustless technology. Education, healthcare, government, entertainment, and telecommunications are just some examples.

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