test: add more tests

tests/script_test/run_workspace_parallel.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+script_bin="$1"
+output="$(${script_bin})"
+
+if [[ ${output} != *"pkg-a"* ]]; then
+  echo "Expected workspace parallel run output to include pkg-a: ${output}" >&2
+  exit 1
+fi
+
+if [[ ${output} != *"pkg-b"* ]]; then
+  echo "Expected workspace parallel run output to include pkg-b: ${output}" >&2
+  exit 1
+fi