Book Image

Hands-On Blockchain with Hyperledger

By : Nitin Gaur, Luc Desrosiers, Venkatraman Ramakrishna, Petr Novotny, Salman A. Baset, Anthony O'Dowd
Book Image

Hands-On Blockchain with Hyperledger

By: Nitin Gaur, Luc Desrosiers, Venkatraman Ramakrishna, Petr Novotny, Salman A. Baset, Anthony O'Dowd

Overview of this book

Blockchain and Hyperledger technologies are hot topics today. Hyperledger Fabric and Hyperledger Composer are open source projects that help organizations create private, permissioned blockchain networks. These find application in finance, banking, supply chain, and IoT among several other sectors. This book will be an easy reference to explore and build blockchain networks using Hyperledger technologies. The book starts by outlining the evolution of blockchain, including an overview of relevant blockchain technologies. You will learn how to configure Hyperledger Fabric and become familiar with its architectural components. Using these components, you will learn to build private blockchain networks, along with the applications that connect to them. Starting from principles first, you’ll learn to design and launch a network, implement smart contracts in chaincode and much more. By the end of this book, you will be able to build and deploy your own decentralized applications, handling the key pain points encountered in the blockchain life cycle.
Table of Contents (20 chapters)
Title Page
Copyright and Credits
Packt Upsell

Testing chaincode

Now we can write unit tests for our chaincode functions, we will use the in-built automated Go testing framework. For more information and documentation, visit Go's official website at:

The framework automatically seeks and executes functions with the following signature:

 func TestFname(*testing.T)

The function name Fname is an arbitrary name that must start with an uppercase letter.

Note that the test suite file containing unit tests must end with the suffix, _test.go; therefore, our test suite file will be named tradeWorkflow_test.go and placed in the same directory as our chaincode file. The first argument of the test function is of the type T, which provides functions for managing test states and supporting formatted test logs. The output of the test is written into the standard output, it can be inspected in the terminal.

SHIM mocking

The SHIM package provides a comprehensive mocking model that can be used to test chaincodes. In our unit...