I am currently learning Solidity through a Udemy course and I am currently covering a section that explains Testing with Mocha. I am using the describe function with syntax that is covered in the example and trying to run the test using 'npm run test'.
Below is the code for Inbox.test.js
const assert = require('assert');
const ganache = require('ganache-cli');
const Web3 = require('web3');
//Provider is a communication layer between web3 lib and some ETH network
const web3 = new Web3(ganache.provider());
class Car{
park (){
return 'stopped';
}
drive (){
return 'vroom';
}
describe('Car', () => {
it('park function', () => {
const car = new Car();
assert.equal(car.park(),'stopped');
});
});
}
}
However, when I try to run this, I get the following error that I am unable to figure out post doing some research online and looking at other stackoverflow threads. In the documentation and examples online(even on the Mocha main site), I see the first argument is a string, yet I get this error.
/Users/rohanmahale/Documents/Solidity/inbox/test/Inbox.test.js:25
describe('Car', () => {
^^
SyntaxError: Unexpected string
at Object.compileFunction (node:vm:352:18)
at wrapSafe (node:internal/modules/cjs/loader:1032:15)
at Module._compile (node:internal/modules/cjs/loader:1067:27)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:168:29)
at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
at async Promise.all (index 0)
at async ESMLoader.import (node:internal/modules/esm/loader:337:24)
at async importModuleDynamicallyWrapper (node:internal/vm/module:437:15)
at async formattedImport (/Users/rohanmahale/Documents/Solidity/inbox/node_modules/mocha/lib/nodejs/esm-utils.js:7:14)
at async Object.exports.requireOrImport (/Users/rohanmahale/Documents/Solidity/inbox/node_modules/mocha/lib/nodejs/esm-utils.js:48:32)
at async Object.exports.loadFilesAsync (/Users/rohanmahale/Documents/Solidity/inbox/node_modules/mocha/lib/nodejs/esm-utils.js:103:20)
at async singleRun (/Users/rohanmahale/Documents/Solidity/inbox/node_modules/mocha/lib/cli/run-helpers.js:125:3)
at async Object.exports.handler (/Users/rohanmahale/Documents/Solidity/inbox/node_modules/mocha/lib/cli/run.js:374:5)
describe shouldn't be inside your Car class.
As it stands, nodejs would expect some class method which would be describe(text, callback). Instead of "text" you're supplying a string.
So this is how it should look like:
class Car{
park (){
return 'stopped';
}
drive (){
return 'vroom';
}
}
describe('Car', () => {
it('park function', () => {
const car = new Car();
assert.equal(car.park(),'stopped');
});
});