Deps and test folders in package

I am building my own package according to https://pkgdocs.julialang.org/v1/creating-packages/. I am wondering at which point the deps/ and test/ folders should appear in the package directory?

after “generate mypkg” I have the src/ folder only.

julia> print(read("test/runtests.jl", String))
ERROR: SystemError: opening file "test/runtests.jl": No such file or directory

Not exactly answering your question, but I think most people use PkgTemplates.jl to generate packages. This auto generates test and a few other things.
I think there is a step missing in the docs (between build and testing) that probably would tell the user to create the test dir manually.

You need the test directory as soon as you have some tests, preferably right from the start.

Ideally you don’t need a deps directory at all. If you don’t know with certainty that you must have some kind of build step, you won’t need it.

Ok! I now make test/runtests.jl manually:

#file runtests.jl
using Test
using mypkg

println("hello!")

But when I try to run test:

(@v1.5) pkg> activate ./test
 Activating environment at `~/data/pkgtest/mypkg/test/Project.toml`

julia> include("test/runtests.jl")
ERROR: LoadError: ArgumentError: Package mypkg not found in current path:
- Run `import Pkg; Pkg.add("mypkg")` to install the mypkg package.