AssociatedTests.jl

Write tests next to the functions and types that they test. Run tests granularly and incrementally with Revise.

# in source file
module Adding
function add1(x::Int)
  x + 1
end

@tests add1 begin
  @test add1(1) == 2
end
end

# in REPL
> test(Adding.add1)
Test Summary: | Pass  Total  Time
add1          |    1      1  0.0s

> test(Adding)
Test Summary: | Pass  Total  Time
Adding        |    1      1  0.0s
  add1        |    1      1  0.0s

The @tests macro is very simple; it essentially just expands as

@tests add1 begin
  @test add1(1) == 2
end

=>

function __runtest__(::Val{add1})
  @testset "add1" begin
    @test add1(1) == 2
  end
end

This means that __runtest__ will get reloaded by Revise without any special effort, and doesn't pollute the global namespace with any local variables defined in the tests.

Then test(f) = parentmodule(f).__runtest__(Val{f}()). One can also pass in two arguments to test in order to run tests in a module other than the parent module. For instance:

module MyVectors

struct MyVector
  ...
end

function Base.getindex(v::MyVector, i)
  ...
end

@tests getindex begin
  ...
end

You can then run these tests with test(MyVectors, getindex) = MyVectors.__runtest__(getindex).

test(MyVectors) iterates through all of the defined methods of MyVectors.__runtest__ and calls them all.