From eb6469096af8d114e53b17b609ecb63e3eba96db Mon Sep 17 00:00:00 2001
From: Nils Winkler <nils@nilswinkler.com>
Date: Mon, 13 Apr 2020 21:53:10 +0200
Subject: [PATCH] Added the parallel test execution code from @rico-chet

See here: https://github.com/rico-chet/bash-it/blob/cd4a039215ae1f1495d72f5a1cbff504f5598efe/test/run#L22
---
 test/run | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/test/run b/test/run
index da1aa061..cf71259b 100755
--- a/test/run
+++ b/test/run
@@ -16,4 +16,26 @@ else
   test_dirs=( "$1" )
 fi
 
-exec $bats_executable ${CI:+--tap} "${test_dirs[@]}"
+if command -v parallel &> /dev/null
+then
+  # Expect to run at least on a dual-core CPU; slightly degraded performance
+  # shouldn't matter otherwise.
+  declare -i -r test_jobs_default=2
+  declare -i -r test_jobs_effective="$(
+    if [ "${TEST_JOBS:-detect}" = "detect" ] \
+      && command -v nproc &> /dev/null
+    then
+      nproc
+    elif [ -n "${TEST_JOBS}" ] \
+      && [ "${TEST_JOBS}" != "detect" ]
+    then
+      echo "${TEST_JOBS}"
+    else
+      echo ${test_jobs_default}
+    fi
+  )"
+  exec "$bats_executable" ${CI:+--tap} --jobs ${test_jobs_effective} \
+    "${test_dirs[@]}"
+else
+  exec "$bats_executable" ${CI:+--tap} "${test_dirs[@]}"
+fi