add minimal extensions unit test

test/test_projects/Diffusion3D_minimal/Project.toml

@@ -0,0 +1,18 @@
+name = "Diffusion3D_minimal"
+uuid = "91637811-9d05-4227-81a2-fe1d069b6ecb"
+authors = ["Samuel Omlin <samuel.omlin@cscs.ch>"]
+version = "0.1.0"
+
+[deps]
+ParallelStencil = "94395366-693c-11ea-3b26-d9b7aac5d958"
+
+[compat]
+ParallelStencil = ">= 0.4.0"
+
+[weakdeps]
+AMDGPU = "21141c5a-9bdb-4563-92ae-f87d6854732e"
+CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
+
+[extensions]
+D3D_AMDGPUExt = "AMDGPU"
+D3D_CUDAExt = "CUDA"

test/test_projects/Diffusion3D_minimal/ext/D3D_AMDGPUExt.jl

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+module D3D_AMDGPUExt
+    import Diffusion3D_minimal
+    h() = return
+end

test/test_projects/Diffusion3D_minimal/ext/D3D_CUDAExt.jl

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+module D3D_CUDAExt
+    import Diffusion3D_minimal
+    g() = return
+end

test/test_projects/Diffusion3D_minimal/src/Diffusion3D_minimal.jl

@@ -0,0 +1,4 @@
+module Diffusion3D_minimal
+    using ParallelStencil
+    f() = return
+end

test/test_projects/Diffusion3D_minimal/test/localtest_diffusion_AMDGPU.jl

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+push!(LOAD_PATH, "@stdlib")  # NOTE: this is needed to enable this test to run from the Pkg manager
+push!(LOAD_PATH, joinpath(@__DIR__, ".."))
+using Test
+using Pkg
+Pkg.activate(joinpath(@__DIR__, "test_projects", "Diffusion3D_minimal"))
+Pkg.instantiate()
+import AMDGPU
+using Diffusion3D_minimal

test/test_projects/Diffusion3D_minimal/test/localtest_diffusion_CUDA.jl

@@ -0,0 +1,8 @@
+push!(LOAD_PATH, "@stdlib")  # NOTE: this is needed to enable this test to run from the Pkg manager
+push!(LOAD_PATH, joinpath(@__DIR__, ".."))
+using Test
+using Pkg
+Pkg.activate(joinpath(@__DIR__, "test_projects", "Diffusion3D_minimal"))
+Pkg.instantiate()
+import CUDA
+using Diffusion3D_minimal

test/test_projects/Diffusion3D_minimal/test/localtest_diffusion_Threads.jl

@@ -0,0 +1,7 @@
+push!(LOAD_PATH, "@stdlib")  # NOTE: this is needed to enable this test to run from the Pkg manager
+push!(LOAD_PATH, joinpath(@__DIR__, ".."))
+using Test
+using Pkg
+Pkg.activate(joinpath(@__DIR__, "test_projects", "Diffusion3D_minimal"))
+Pkg.instantiate()
+using Diffusion3D_minimal