Begin with some "simple" tests ...

If the production version is greater than development version, the tests gives an error.

tests.sh

@@ -1,8 +1,54 @@
-#!/bin/sh
+#!/usr/bin/env bash
 # Shellcheck the script
+# Note: using bash for more power in testing (the final user doesn't need it).
+
+# Functions
+
+# Test Version
+# Receives two parameters in x.x.x format.
+# Returns true or false
+# Sources:
+#  https://unix.stackexchange.com/questions/285924/how-to-compare-a-programs-version-in-a-shell-script
+#  https://stackoverflow.com/questions/4023830/how-to-compare-two-strings-in-dot-separated-version-format-in-bash
+test_version (){
+
+
+currentver="$(gcc -dumpversion)"
+requiredver="5.0.0"
+ if [ "$(printf '%s\n' "$requiredver" "$currentver" | sort -V | head -n1)" = "$requiredver" ]; then 
+        echo "Greater than or equal to 5.0.0"
+ else
+        echo "Less than 5.0.0"
+ fi
+
+###################
+
+verlte() {
+    [  "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
+}
+
+verlt() {
+    [ "$1" = "$2" ] && return 1 || verlte $1 $2
+}
+
+##################
+
+
+
+
+}
+
+
+# Tests
+
+get_nano_version () {
+  local tested_version=""
+  # x.x.x
+  local actual_version="nano --version | cut -d ' ' -f 4"
+}
 
 nano --version
 shellcheck --version
 
-# shellcheck -f diff *.sh | git apply | git commit -a -m "Shellcheck fast corrections"
+# ....shellcheck -f diff *.sh | git apply | git commit -a -m "Shellcheck fast corrections"
 shellcheck *.sh