This is a tool that allows you to get the testcases, problems (as pdfs) and initial setup for your language of choice for a codeforces competition. I might add more features over time like support for different languages.
Problems for competitions are downloaded concurrently using go-routines. The code is separated into modules each of which is responsible for 1 thing. There are a some unit tests to ensure that the code works. Also uses templates to set up your initial code file.
When you build the code you have 3 tools. The competition parser (cfc-parser) that allows you to parse a competition. The code tester, only works with C++ currently (cfc-tester). For those two programs you can also use --help to find out how they work. The last thing is cfc-mktest which allows you to quickly handcraft a testcase. It doesn't have --help but instead when run, it asks for user input with a prompt.
Building the code is dead simple as it comes with a Makefile. Just do
make build
I have written a few unit tests for this code but not that many. To run the tests for a package simply go to that package's folder and run go test