[FEATURE] Error readable to mock error

[daisy1754]

Is your feature request related to a problem? Please describe. I have a program to read data from the stream. I want to write a test to cover the error path.

readStream.on("error", {
 // I want to run code here in my unit test
});

Describe the solution you'd like It would be nice if the library can provide ErrorReadble which I can pass error object

const mock = new ErrorReadble(new Error("mock error"));

[b4nst]

Should not be difficult, let me try something when I found some time (probably this weekend). Feel free to open a PR in the meantime if you wish to contribute.