Skip to content

Testing Smart Contracts

Testing Smart Contracts

You can test your Web3j app with Web3j-Unit.


Add the gradle dependency.

repositories {
implementation "org.web3j:core:4.5.11"
testCompile "org.web3j:web3j-unit:4.5.11"

Deploy your contract in the test.

public class GreeterTest {

    public void greeterDeploys(Web3j web3j, TransactionManager transactionManager, ContractGasProvider gasProvider) {
        Greeter greeter = Greeter.deploy(web3j, transactionManager, gasProvider, "Hello EVM").send()
        String greeting = greeter.greet().send()
        assertEquals("Hello EVM", greeting)


For more detailed information check the testing section