open-mpi: add test

Closes #35669.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/Library/Formula/open-mpi.rb b/Library/Formula/open-mpi.rb
index 25042d661..be341746c 100644
--- a/Library/Formula/open-mpi.rb
+++ b/Library/Formula/open-mpi.rb
@@ -49,4 +49,27 @@ class OpenMpi < Formula
     libexec.install bin/'vtsetup.jar'
     inreplace bin/'vtsetup', '$bindir/vtsetup.jar', '$prefix/libexec/vtsetup.jar'
   end
+
+  test do
+    (testpath/"hello.c").write <<-EOS.undent
+      #include <mpi.h>
+      #include <stdio.h>
+
+      int main()
+      {
+        int size, rank, nameLen;
+        char name[MPI_MAX_PROCESSOR_NAME];
+        MPI_Init(NULL, NULL);
+        MPI_Comm_size(MPI_COMM_WORLD, &size);
+        MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+        MPI_Get_processor_name(name, &nameLen);
+        printf("[%d/%d] Hello, world! My name is %s.\n", rank, size, name);
+        MPI_Finalize();
+        return 0;
+      }
+    EOS
+    system "#{bin}/mpicc", "hello.c", "-o", "hello"
+    system "./hello"
+    system "#{bin}/mpirun", "-np", "4", "./hello"
+  end
 end