diff --git a/bin/lib.sh b/bin/lib.sh
index 4f0d24bb..f1ea27f9 100644
--- a/bin/lib.sh
+++ b/bin/lib.sh
@@ -1,5 +1,3 @@
-#!/usr/bin/env bash
-set -Eeu
 
 echo_versioner_env_vars()
 {
@@ -130,24 +128,42 @@ exit_non_zero_unless_started_cleanly()
   # Handle known warnings (eg waiting on Gem upgrade)
   # local -r SHADOW_WARNING="server.rb:(.*): warning: shadowing outer local variable - filename"
   # DOCKER_LOG=$(strip_known_warning "${DOCKER_LOG}" "${SHADOW_WARNING}")
+
   local -r SERVICE_NAME="${1}"
   echo
   echo "Checking if ${SERVICE_NAME} started cleanly."
-  if [ "$(top_5)" != "$(clean_top_5)" ]; then
+
+  local -r DOCKER_LOG=$(docker logs "${CONTAINER_NAME}" 2>&1)
+  local -r top_5=$(echo "${DOCKER_LOG}" | head -5)
+
+  if ! array_prefix "$(clean_top_5)" "${top_5}" ; then
     echo "${SERVICE_NAME} did not start cleanly: docker log..."
     echo 'expected------------------'
-    echo "$(clean_top_5)"
+    clean_top_5
     echo
     echo 'actual--------------------'
-    echo "$(top_5)"
+    echo "${top_5}"
     echo
     echo 'diff--------------------'
-    grep -Fxvf <(clean_top_5) <(top_5)
+    grep -Fxvf <(clean_top_5) <(echo "${top_5}")
     echo
     exit 42
   fi
 }
 
+array_prefix()
+{
+  readarray -t expected_lines <<<"${1}"
+  readarray -t actual_lines <<<"${2}"
+  for i in {0..4}
+  do
+     if ! [[ "${actual_lines[$i]}" =~ ^"${expected_lines[$i]}" ]] ; then
+       return 1 # false
+     fi
+  done
+  return 0  # true
+}
+
 top_5()
 {
   docker logs "${CONTAINER_NAME}" 2>&1 | head -5
@@ -158,7 +174,7 @@ clean_top_5()
   # 1st 5 lines on Puma
   local -r L1="Puma starting in single mode..."
   local -r L2='* Puma version: 6.5.0 ("Sky'"'"'s Version")'
-  local -r L3='* Ruby version: ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [x86_64-linux-musl]'
+  local -r L3='* Ruby version: ruby 3.3.6 (2024-11-05 revision 75015d4c1f)'  # [x86_64-linux-musl]
   local -r L4="*  Min threads: 0"
   local -r L5="*  Max threads: 5"
   #
diff --git a/bin/run_tests.sh b/bin/run_tests.sh
index 36bb8aac..3f7d5c3e 100755
--- a/bin/run_tests.sh
+++ b/bin/run_tests.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -Eeu
 
 export ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"