The Flow JS Testing Framework is essentially a set of helper methods. They can be used in an
opinionated way, envisioned by Flow Team. Or they can work as building blocks, allowing developers to build their own
testing solution as they see fit. Following methods used inside other framework methods, but we feel encouraged to list
them here as well.
getTemplate(file, addressMap, byAddress)Returns Cadence template as string with addresses replaced using addressMap
Name Type Optional Description filestring relative (to the place from where the script was called) or absolute path to the file containing the code addressMapAddressMap ✅ object to use for address mapping of existing deployed contracts. Default: {} byAddressboolean ✅ whether addressMap is {name:address} or {address:address} type. Default: false
Type Description string content of a specified file
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import path from "path"
import {init, getTemplate} from "@onflow/flow-js-testing"
const main = async () => {
const basePath = path.resolve(__dirname, "../cadence" )
init(basePath)
const template = await getTemplate( "../cadence/scripts/get-name.cdc" )
console.log({template})
}
main()
getContractCode(name, addressMap)Returns Cadence template from file with name in _basepath_/contracts folder
Name Type Optional Description namestring name of the contract template addressMapAddressMap ✅ object to use for address mapping of existing deployed contracts
Type Description string Cadence template code for specified contract
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import path from "path"
import {init, emulator, getContractCode} from "@onflow/flow-js-testing"
const main = async () => {
const basePath = path.resolve(__dirname, "../cadence" )
await init(basePath)
await emulator.start()
// Let's assume we need to import MessageContract
await deployContractByName({name: "MessageContract" })
const MessageContract = await getContractAddress( "MessageContract" )
const addressMap = {MessageContract}
const contractTemplate = await getContractCode( "HelloWorld" , {
MessageContract,
})
console.log({contractTemplate})
await emulator.stop()
}
main()
getTransactionCode(name, addressMap)Returns Cadence template from file with name in _basepath_/transactions folder
Name Type Optional Description namestring name of the transaction template addressMapAddressMap ✅ object to use for address mapping of existing deployed contracts
Type Description string Cadence template code for specified transaction
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import path from "path"
import {init, emulator, getTransactionCode} from "@onflow/flow-js-testing"
const main = async () => {
const basePath = path.resolve(__dirname, "../cadence" )
await init(basePath)
await emulator.start()
// Let's assume we need to import MessageContract
await deployContractByName({name: "MessageContract" })
const MessageContract = await getContractAddress( "MessageContract" )
const addressMap = {MessageContract}
const txTemplate = await getTransactionCode({
name: "set-message" ,
addressMap,
})
console.log({txTemplate})
await emulator.stop()
}
main()
getScriptCode(name, addressMap)Returns Cadence template from file with name in _basepath_/scripts folder
Name Type Optional Description namestring name of the script template addressMapAddressMap ✅ object to use for address mapping of existing deployed contracts
Type Description string Cadence template code for specified script
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import path from "path"
import {init, emulator, getScriptCode} from "@onflow/flow-js-testing"
const main = async () => {
const basePath = path.resolve(__dirname, "../cadence" )
await init(basePath)
await emulator.start()
// Let's assume we need to import MessageContract
await deployContractByName({name: "MessageContract" })
const MessageContract = await getContractAddress( "MessageContract" )
const addressMap = {MessageContract}
const scriptTemplate = await getScriptCode({
name: "get-message" ,
addressMap,
})
console.log({scriptTemplate})
await emulator.stop()
}
main()
If you don't have any contract dependencies, you can use those methods without specifying address map as second parameter.
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import path from "path"
import {
init,
getContractCode,
getTransactionCode,
getScriptCode,
} from "@onflow/flow-js-testing"
const main = async () => {
const basePath = path.resolve(__dirname, "../cadence" )
await init(basePath)
const contractWallet = await getContractCode({name: "Wallet" })
const txGetCapability = await getTransactionCode({name: "get-capability" })
const scriptGetBalance = await getScriptCode({name: "get-balance" })
console.log({contractWallet, txGetCapability, scriptGetBalance})
}
main()
