Add test compose file and code

docker-compose-test.yml

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+services:
+  slurmfrontend:
+        build:
+          context: ./frontend
+          dockerfile: ./Dockerfile
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/frontend:latest
+        container_name: spack-stack-frontend
+        hostname: slurmfrontend
+        user: admin
+        volumes:
+                - home-vol:/home/admin
+                - opt-vol:/opt
+                - ./test:/home/admin/test
+        ports:
+                - 8888:8888
+  slurmmaster:
+        build:
+          context: ./master
+          dockerfile: ./Dockerfile
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/master:latest
+        container_name: spack-stack-master
+        hostname: slurmmaster
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_CPUS_ON_NODE=8
+        ports:
+                - 6817:6817
+                - 6818:6818
+                - 6819:6819
+  slurmnode1:
+        build:
+          context: ./node
+          dockerfile: ./Dockerfile
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/node:latest
+        container_name: spack-stack-node1
+        hostname: slurmnode1
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_NODENAME=slurmnode1
+                - SLURM_CPUS_ON_NODE=8
+        links:
+                - slurmmaster
+  slurmnode2:
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/node:latest
+        container_name: spack-stack-node2
+        hostname: slurmnode2
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_NODENAME=slurmnode2
+                - SLURM_CPUS_ON_NODE=8
+        links:
+                - slurmmaster
+  slurmnode3:
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/node:latest
+        container_name: spack-stack-node3
+        hostname: slurmnode3
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_NODENAME=slurmnode3
+                - SLURM_CPUS_ON_NODE=8
+        links:
+                - slurmmaster
+  slurmnode4:
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/node:latest
+        container_name: spack-stack-node4
+        hostname: slurmnode4
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_NODENAME=slurmnode4
+                - SLURM_CPUS_ON_NODE=8
+        links:
+                - slurmmaster
+  slurmnode5:
+        image: ghcr.io/noaa-gsl/dockerspackstackslurmcluster/node:latest
+        container_name: spack-stack-node5
+        hostname: slurmnode5
+        user: admin
+        volumes:
+                - home-vol:/home/admin:nocopy
+                - opt-vol:/opt:ro
+                - ./test:/home/admin/test
+        environment:
+                - SLURM_NODENAME=slurmnode5
+                - SLURM_CPUS_ON_NODE=8
+        links:
+                - slurmmaster
+volumes:
+        home-vol:
+        opt-vol:

test/hello.baseline

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+Hello world from host slurmnode1, rank 0 out of 6
+Hello world from host slurmnode1, rank 1 out of 6
+Hello world from host slurmnode2, rank 2 out of 6
+Hello world from host slurmnode2, rank 3 out of 6
+Hello world from host slurmnode3, rank 4 out of 6
+Hello world from host slurmnode3, rank 5 out of 6
+foo

test/mpi_hello.f90

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+program mpi_hello
+
+  use iso_fortran_env, only : output_unit
+  use mpi
+
+  integer :: error
+  integer :: world_size, world_rank, name_len, i
+  character(len=MPI_MAX_PROCESSOR_NAME) :: host_name
+  character(len=6) :: rank
+  character(len=6) :: size
+
+  ! Initialize the MPI environment
+  call MPI_Init(error)
+
+  ! Get the number of processes
+  call MPI_Comm_size(MPI_COMM_WORLD, world_size, error)
+  write(size,'(I6)') world_size
+
+  ! Get the rank of the process
+  call MPI_Comm_rank(MPI_COMM_WORLD, world_rank, error)
+  write(rank,'(I6)') world_rank
+
+  ! Get the name of the processor
+  call MPI_Get_processor_name(host_name, name_len, error)
+
+  do i=0, world_size - 1
+
+    call MPI_Barrier(MPI_COMM_WORLD, error)
+
+    if (i==world_rank) then
+
+      ! Print off a hello world message
+      write(*,"(A, A, A, A, A, A)")  "Hello world from host ", & 
+                                       TRIM(host_name), &
+                                       ", rank ", &
+                                       TRIM(ADJUSTL(rank)), &
+                                       " out of ", &
+                                       TRIM(ADJUSTL(size))
+
+      ! Flush stdout
+      flush(output_unit)
+
+    end if
+
+  end do
+
+  ! Finalize the MPI environment.
+  call MPI_Finalize(error)
+
+end program mpi_hello

test/test_hello.sh

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+#!/bin/bash
+
+set -e
+
+module use /opt/spack-stack/envs/unified-env/install/modulefiles/Core
+module load stack-gcc
+module load stack-openmpi
+module load stack-python
+
+mpif90 -o hello.exe mpi_hello.f90
+srun -N 3 --tasks-per-node=2 hello.exe | sort > hello.out
+
+diff hello.out hello.baseline