assert-err
assertion library that throws user-specified error types (accepts error class and message)
Installation
npm i --save assert-err
Usage
Example 1: full example
// example-1.jsvar assertErr = { // line 6 return a + b} // line 10/*TypeError: "b" must be a number at add (example-1.js:6:3) at Object.<anonymous> (example-1.js:10:1) at Module._compile (module.js:413:34) at Object.Module._extensions..js (module.js:422:10) at Module.load (module.js:357:32) at Function.Module._load (module.js:314:12) at Function.Module.runMain (module.js:447:10) at startup (node.js:139:18) at node.js:999:3*/
Example 2: Error props
If using global.Error, assertErr accepts a props
argument to extend error
// 0 args// { [Error: boom] code: 1, status: 'status' }
Example 3: args
assertErr supports up to 5 err constructor args
// 0 args // 1 args // 2 args // 3 args // 4 args // 5 args// error... // 6 args// Error: assertErr does not support more than five Error args
License
MIT