Fix error in json parsing

[ZhKostev]

Fix for "uninitialized constant TelegramBot::ApiResponse::ResponseError" + add spec for tests

[eljojo]

Thanks for opening up the PR and adding tests for this.

My thoughts:

• I'd prefer if we stick to minitest, which is installed but currently has no tests in it.
• it's unclear to me how this actually solves the problem, since you're just renaming the constant. Can you expand on how this fixes the problem?
• I'd assert that the proper exception is being raised (with fail_silently: false), instead of asserting that no exception is raised.

[ZhKostev]

@eljojo got it. I will remove rspec and investigate more about core issue, but this issue (uninitialized constant ) introduced only with rails as I see (for Schwad this issue not exists). I guess some intersection in naming or how require chain is build. It will be in a couple of days (some other work to do)

[eljojo]

Sure, take it easy.
I've been busy travelling these days, but I'll try to take a look over the weekend.

I don't think rails has something to do with it. My hunch is that ruby 2.5 is messing with things, but @Schwad not being able to reproduce is baffling.

It's also fine if we don't fix this unless @vpereira provides a more straightforward way for us to reproduce this error.

[ZhKostev]

@eljojo basically I experienced this error on ruby 2.4 and rails 5.2. This is fix for me as well

[Schwad]

@ZhKostev aha thanks for this info! I will run same test but within rails c in a Rails 5.2 app