Add tests to ensure that success messages are green and error messages are red

In an attempt to eliminate the possibility of a trivial regression, tests should be included to verify that

• Success messages are output to the console with a green colour; and,
• error messages are output to the console with a red colour!

I haven't included these tests as I'm not yet sure how to go about testing this.

The module I use to colourize the output namely, Chalk, does so by emitting ANSI escape codes however, the terminal interprets these ANSI escape codes before I can evaluate them. Hm :confused:.