Add Aqua testing (#116)

* add Aqua and ExplicitImports testing

* format

* remove ExplicitImports.jl again

README.md

@@ -5,6 +5,7 @@
 [![Build Status](https://github.com/trixi-framework/P4est.jl/workflows/CI/badge.svg)](https://github.com/trixi-framework/P4est.jl/actions?query=workflow%3ACI)
 [![Codecov](https://codecov.io/gh/trixi-framework/P4est.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/trixi-framework/P4est.jl)
 [![Coveralls](https://coveralls.io/repos/github/trixi-framework/P4est.jl/badge.svg?branch=main)](https://coveralls.io/github/trixi-framework/P4est.jl?branch=main)
+[![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 [![License: MIT](https://img.shields.io/badge/License-MIT-success.svg)](https://opensource.org/licenses/MIT)
 [![Downloads](https://shields.io/endpoint?url=https://pkgs.genieframework.com/api/v1/badge/P4est)](https://pkgs.genieframework.com?packages=P4est)
 

src/LibP4est.jl

@@ -1,6 +1,6 @@
 module LibP4est
 
-using CEnum
+using CEnum: CEnum, @cenum
 
 to_c_type(t::Type) = t
 to_c_type_pairs(va_list) = map(enumerate(to_c_type.(va_list))) do (ind, type)

test/Project.toml

@@ -1,9 +1,11 @@
 [deps]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 MPI = "da04e1cc-30fd-572f-bb4f-1f8673147195"
 MPIPreferences = "3da0fdf6-3ccc-4f1b-acd9-58baa6c99267"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
+Aqua = "0.7, 0.8"
 MPI = "0.20"
 MPIPreferences = "0.1.3"
 Test = "1"

test/runtests.jl

@@ -11,6 +11,7 @@ import MPIPreferences
 @info "Testing P4est.jl with" MPIPreferences.binary MPIPreferences.abi
 
 @time @testset "P4est.jl tests" begin
+    include("test_aqua.jl")
     # For some weird reason, the MPI tests must come first since they fail
     # otherwise with a custom MPI installation.
     @time @testset "MPI" begin

test/test_aqua.jl

@@ -0,0 +1,11 @@
+module TestAqua
+
+using Aqua
+using Test
+using P4est
+
+@testset "Aqua.jl" begin
+    Aqua.test_all(P4est; unbound_args = false)
+end
+
+end #module