Add tests for the Config class

[fauneau]

The main goal of this pull request is to add tests to the Config class.

Additional changes:

• Created class constant _CONFIG_FILE to replace string literal "config.toml".
  This is necessary for testing purposes and good practice in general.
• Created class constant _SAMPLE_CONFIG_FILE to replace string literal "sample.config.toml".
  This is necessary for testing purposes and good practice in general.
• Renamed save_config to dump_config
  To have the same function names as toml
• Added ".vscode/" to .gitignore
  This is useful not to commit VS Code project settings

This pull request includes the commit from #221, so I will close it.

[fauneau]

Following #24 major changes, there is some conflict on this branch.
I will resolve it and check everything works as it should on tuesday. (->Easter)

[ARajgor]

is it working?

[fauneau]

Good catch! It wasn't working properly. The major changes that happened added some setters that I forgot to update when rebasing my work. The setters are never used (except for one of my tests), if vscode is to be trusted, so it would have been hard to see.

It's fixed now. For the rest, it works properly for me.

My changes are mostly renames and variable creations. The 4 created tests pass as well.

[ARajgor]

so can you add one functionality? when the config.sample.toml file changes like added the new variables it automatically update the config.toml without touching the API keys values. just adding the new variables.

also why do we need a dedicated file for testing config?

[fauneau]

I'm not sure what you mean. So, please tell me if I understand it correctly.
You would like Config to read sample.config.toml, then add all the variables from it to config.toml without their values (which are just filler values anyways).

I have some questions about this.
We can't assume config.toml exists. So, I'm guessing we're doing it only if it exists, correct?
And, is that really necessary? We can fill the values from the UI even if the variables don't appear in config.toml, right?

About the dedicated file for testing config, are you speaking of having a file that contains all the tests for the class Config? If so, this is the usual way to go about testing classes. Or, about the temporary file that those tests use? In this case, this is the easiest way to check if saving and loading config data works while keeping those tests implementation-agnostic. If we wanted to remove it, we could maybe simulate the temporary file or we can tie the tests to calls to toml functions.

[Israel-Laguan]

NIT:
Delete extra lines