Jest prepend ": " to any Error without message

[bertho-zero]

// index.test.js

console.log(new Error());

Result with jest:

Error: 
    at Object.<anonymous> (/home/bertho/oa/packages/verror/test/index.test.js:1:13)
    at Module._compile (internal/modules/cjs/loader.js:1158:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
    at Module.load (internal/modules/cjs/loader.js:1002:32)
    at Function.Module._load (internal/modules/cjs/loader.js:901:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
    at internal/main/run_main_module.js:18:47

Result with node:

Error
    at Object.<anonymous> (/home/bertho/oa/packages/verror/test/index.test.js:1:13)
    at Module._compile (internal/modules/cjs/loader.js:1158:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
    at Module.load (internal/modules/cjs/loader.js:1002:32)
    at Function.Module._load (internal/modules/cjs/loader.js:901:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
    at internal/main/run_main_module.js:18:47

When there is no message for the error, the behavior of Javascript is to display just the name of the error, Jest adds a colon and a space in all cases.

[thymikee]

Sounds like an opportunity to contribute if you care :)

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