ModulePlay is a simple example of using module tools. For the full explanation see "getting_started_faq.md".
From inside the REPL you can experiment as you create your module using the "run.jl" file.
julia> include("run.jl) # assumes you are in the project root folder.
While you develop your tests, the "test.jl" file will run all your tests.
julia> include("test.jl")
Notice that each of these files loads the latest version of your module, first.